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Wire Tree Sculpture

A wire tree sculpture is a great way to spruce up a room without having the pain and mess of having a live tree in the house. The wire tree sculptures are good for models for a larger project and for the full-scale item itself. These are often created by artists because you are able to be very creative at a reasonable price and with a very limited amount of time. A tree is one of the most interesting things that can be made as a model with wire. If the artists has a good background with sketching trees, this will help because the knowledge of the proportions of trees will be helpful in the sculpting process.

Choosing The Wire

The wire that is chosen for the artistic piece is going to set the mood for your tree. If you want the tree to have a lighter, more airy feeling, a smaller gauge wire is best, but if you want something larger and more defined, a thicker, heavier wire will look much better. These kinds of wire can be purchased at craft stores, big retailers, home improvement stores or at Bonsai Tree Gardener. They are sold on spools, so make sure you get the correct amount, and choose between the common types of metal, steel or copper. Copper will be more bendable, but it will remain copper-colored, however steel isn’t as pliable but will be able to be colored.

Tools Required

You will also need to choose which tools you want to use for the production of your tree. Your hands will serve for most of the detail work; however a pair of needle nose pliers will also be helpful. The wire will be able to be bent without problem in most cases, but for the tiny curls and bending the pliers will be helpful. If you choose to use a similar gauge to coat hangers, this will most assuredly need at least one pair of pliers for bending.

Creating Your Sculpture

After you have purchased all of the wire and have planned out your tree and gathered your tools, you are ready to create your new piece of art. The base should be created first since it is the trunk of the tree. An easy way to do this is to take the pliers and bend the wire so it zigzags up and down vertically to create the trunk, and splay the bottom out while flattening the individual wires just like roots.

This will allow the tree to sit up on its own. You can also spiral the wire from the bottom to the top, both of these ideas will give you a realistic-looking tree while still being rather artistic. The leaves and the top of the tree in general can either be contoured or you can add an additional piece and connect them. If the artwork has leaves, make sure to vary the position, size, and area that the leaves are placed. Make sure the area where the leaves are looks full as well; continue adding leaves until it looks desirable to you. Using coat-hanger-like wire will result in it being much more difficult to do the top of the tree since it does not end as easily as the more rounded, smaller wire.

For more instructions on how to create or to purchase a wire tree sculpture, visit Wire Tree Sculpture | Bonsai Tree Gardener — The #1 Guide To Bonsai Trees on the web.

Scientists have developed the largest ever family tree of a major group of flowering plants called monocots, which could help protect their diversity.

Monocots account for a quarter of all flowering plants. They are among the most diverse and economically important plants on the planet, but their evolutionary lines have never been properly mapped. Monocots include staples such as corn, rice, wheat and barley; many tropical fruits such as pineapples and bananas; and other foods such as dates and sugarcane. Monocots such as grasses, bamboo, palms, and their derivations including fibres, are used as key building materials in many countries such as in China.

Now, researchers at Imperial College London have created the most up-to-date family tree or phylogenetic tree, which traces the lines of evolutionary descent of monocots. The researchers analysed DNA samples from across the globe, aiming to determine what factors affected the diversity of monocot species.

Their work could help scientists to conserve the biodiversity of monocots and lead to new types of uses for these plants, such as in the development of new medicines.

Professor Vincent Savolainen, study co-author from the Department of Life Sciences at Imperial College London, said: "Monocots are so important in our lives, providing us with essential food and building materials. Our study is not only the most detailed family tree of monocot species ever developed, it is also importantly helping us to understand what factors affect their diversity. This could lead to better methods for conserving and protecting them.

"It may also lead to new uses for them such as in medicines. Sometimes the best active compound to use in medicine is found in a different species to the one in which it was initially discovered. Therefore, testing close evolutionary relatives may reveal a slightly different molecule that has a stronger effect in combatting one particular disease."

As expected, the team in today's study found that biological factors - such as the way different monocots evolved to take advantage of their environment - played a part in their diversity. However, the researchers discovered that the most important factors in the diversity of monocots in any given region were geographical factors such as the habitat size, its latitude, and altitude.

In particular, they found that the size of the habitat accounted for a third of the species diversity. They suggest this is likely because a bigger habitat means that there are generally more resources and less competition, which enables more species to thrive together rather than compete against each other. They also found that species diversity was reduced at higher altitudes. This may be because temperatures are lower and there is less water available, which causes fiercer competition among monocots for fewer resources.

The researchers were also able to verify previous findings that monocot species are most varied around the equator, and that the closer monocots are to the poles, the fewer species are available. This might be due to higher UV radiation at the equator, causing more genetic mutations and species variation in equatorial regions as a result.

This research analyses 1,987 of the 2,713 types of monocot worldwide. Researchers in this field will now look to increase their sampling to ultimately encompass the roughly 400,000 plant species, to create the entire botanical 'tree of life'.

The study was published in >Botanical Journal of the Linnean Society.

Author: Caroline Brogan | Source: Imperial College London [November 09, 2016]

The diversity of mammals on Earth exploded straight after the dinosaur extinction event, according to UCL researchers. New analysis of the fossil record shows that placental mammals, the group that today includes nearly 5000 species including humans, became more varied in anatomy during the Paleocene epoch - the 10 million years immediately following the event.

Senior author, Dr Anjali Goswami (UCL Genetics, Evolution & Environment), said: "When dinosaurs went extinct, a lot of competitors and predators of mammals disappeared, meaning that a great deal of the pressure limiting what mammals could do ecologically was removed. They clearly took advantage of that opportunity, as we can see by their rapid increases in body size and ecological diversity. Mammals evolved a greater variety of forms in the first few million years after the dinosaurs went extinct than in the previous 160 million years of mammal evolution under the rule of dinosaurs."

The Natural Environment Research Council-funded research, published today in the Biological Journal of the Linnean Society, studied the early evolution of placental mammals, the group including elephants, sloths, cats, dolphins and humans. The scientists gained a deeper understanding of how the diversity of the mammals that roamed the Earth before and after the dinosaur extinction changed as a result of that event.

Placental mammal fossils from this period have been previously overlooked as they were hard to place in the mammal tree of life because they lack many features that help to classify the living groups of placental mammals. Through recent work by the same team at UCL, this issue was resolved by creating a new tree of life for placental mammals, including these early forms, which was described in a study published in Biological Reviews yesterday.

First author of both papers, Dr Thomas Halliday (UCL Earth Sciences and Genetics, Evolution & Environment), said: "The mass extinction that wiped out the dinosaurs 66 million years ago is traditionally acknowledged as the start of the 'Age of Mammals' because several types of mammal appear for the first time immediately afterwards.

"Many recent studies suggest that little changed in mammal evolution during the Paleocene but these analyses don't include fossils from that time. When we look at the mammals that were present, we find a burst of evolution into new forms, followed by specialisation that finally resulted in the groups of mammals we see today. The earliest placental mammal fossils appear only a few hundred thousand years after the mass extinction, suggesting the event played a key role in diversification of the mammal group to which we belong."

The team studied the bones and teeth of 904 placental fossils to measure the anatomical differences between species. This information was used to build an updated tree of life containing 177 species within Eutheria (the group of mammals including all species more closely related to us than to kangaroos) including 94 from the Paleocene - making it the tree with the largest representation from Paleocene mammals to date. The new tree was analysed in time sections from 140 million years ago to present day, revealing the change in the variety of species.

Three different methods were used by the team to investigate the range and variation of the mammals present and all showed an explosion in mammal diversity after the dinosaur extinction. This is consistent with theories that mammals flourished when dinosaurs were no longer hunting them or competing with them for resources.

Dr Anjali Goswami (UCL Genetics, Evolution & Environment), added: "Extinctions are obviously terrible for the groups that go extinct, non-avian dinosaurs in this case, but they can create great opportunities for the species that survive, such as placental mammals, and the descendants of dinosaurs: birds."

Professor Paul Upchurch (UCL Earth Sciences), co-author of the Biological Reviews study, added: "Several previous methodological studies have shown that it is important to include as many species in an evolutionary tree as possible: this generally improves the accuracy of the tree. By producing such a large data set, we hope that our evolutionary tree for Paleocene mammals is more robust and reliable than any of the previous ones. Moreover, such large trees are very useful for future studies of large-scale evolutionary patterns, such as how early placental mammals dispersed across the continents via land bridges that no longer exist today."

The team are now investigating rates of evolution in these mammals, as well as looking at body size more specifically. Further work will involve building data from DNA into these analyses, to extend these studies to modern mammals.

Source: University College London [December 21, 2015]

Placental mammals consist of three main groups that diverged rapidly, evolving in wildly different directions: Afrotheria (for example, elephants and tenrecs), Xenarthra (such as armadillos and sloths) and Boreoeutheria (all other placental mammals). The relationships between them have been a subject of fierce controversy with multiple studies coming to incompatible conclusions over the last decade leading some researchers to suggest that these relationships might be impossible to resolve.

There are thus many outstanding questions such as which is the oldest sibling of the three? Did the mammals go their separate ways due to South America and Africa breaking apart? And if not, when did placentals split up?

"This has been one of the areas of greatest debate in evolutionary biology, with many researchers considering it impossible to resolve," said lead author Dr Tarver of Bristol's School of Earth Sciences. "Now we've proven these problems can be solved -- you just need to analyse genome-scale datasets using models that accurately reflect genomic evolution."

The researchers assembled the largest mammalian phylogenomic dataset ever collected before testing it with a variety of models of molecular evolution, choosing the most robust model and then analysing the data using several supercomputer clusters at the University of Bristol and the University of Texas Advanced Computing Centre. "We tested it to destruction," said Dr Tarver. "We threw the kitchen sink at it."

"A complication in reconstructing evolutionary histories from genomic data is that different parts of genomes can and often do give conflicting accounts of the history," said Dr Siavash Mirarab at the University of California San Diego, USA. "Individual genes within the same species can have different histories. This is one reason why the controversy has stood so long -- many thought the relationships couldn't be resolved."

To address the complexities of analysing large numbers of genes shared among many species, the researchers paired two fundamentally different approaches -- concatenated and coalescent-based analyses -- to confirm the findings. When the dust settled, the team had a specific family tree showing that Atlantogenata (containing the sibling groups of African Afrotheria and the South American Xenarthra) is the sister group to all other placentals.

Because many conflicting family trees have already been published, the team then gathered three of the most influential rivals and tested them against each other with the same model. All of the previous studies suddenly fell into line, their data agreeing with Tarver and colleagues.

With the origins of the family tree resolved, what does this mean for placental mammals? The researchers folded in another layer -- a molecular clock analysis. "The molecular clock analysis uses a combination of fossils and genomic data to estimate when these lineages diverged from each other," said author Dr Mario Dos-Reis of Queen Mary London, UK. "The results show that the afrotherians and xenarthrens diverged from one another around 90 million years ago."

Previously, scientists thought that when Africa and South America separated from each other over 100 million years ago, they broke up the family of placental mammals, who went their separate evolutionary ways divided by geography. But the researchers found that placental mammals didn't split up until after Africa and South America had already separated.

"We propose that South America's living endemic Xenarthra (for exmaple, sloths, anteaters, and armadillos) colonized the island-continent via overwater dispersal," said study author Dr Rob Asher of the University of Cambridge, UK.

Dr Asher suggests that this isn't as difficult as you might think. Mammals are among the great adventurers of the animal kingdom, and at the time the proto-Atlantic was only a few hundred miles wide. We already know that New World monkeys crossed the Atlantic later, when it was much bigger, probably on rafts formed from storm debris. And, of course, mammals repeatedly colonised remote islands like Madagascar.

"You don't always need to overturn the status quo to make a big impact," said Dr Tarver. "All of the competing hypotheses had some evidence to support them -- that's precisely why it was the source of such controversy. Proving the roots of the placental family tree with hard empirical evidence is a massive accomplishment."

The findings are published in Genome Biology and Evolution journal.

Source: University of Bristol [February 15, 2016]

Scientists have found the oldest fossils of the familiar pine tree that dominates Northern Hemisphere forests today.

Scientists from the Department of Earth Sciences at Royal Holloway, University of London have found the oldest fossils of the familiar pine tree that dominates Northern Hemisphere forests today.

The 140-million-year-old fossils (dating from the Cretaceous 'Age of the Dinosaurs') are exquisitely preserved as charcoal, the result of burning in wildfires. The fossils suggest that pines co-evolved with fire at a time when oxygen levels in the atmosphere were much higher and forests were especially flammable.

Dr Howard Falcon-Lang from Royal Holloway, University of London) discovered the fossils in Nova Scotia, Canada. He said: "Pines are well adapted to fire today. The fossils show that wildfires raged through the earliest pine forests and probably shaped the evolution of this important tree." Modern pines store flammable resin-rich deadwood on the tree making them prone to lethal fires. However, they also produce huge numbers of cones that will only germinate after a fire, ensuring a new cohort of trees is seeded after the fire has passed by."

The research is published in the journal Geological Society of America.

Source: University of Royal Holloway London [March 10, 2016]

In a remarkable technical feat, researchers have sequenced DNA from fossils in Spain that are about 300,000 to 400,000 years old and have found an ancestor—or close relative—of Neanderthals. The nuclear DNA, which is the oldest ever sequenced from a member of the human family, may push back the date for the origins of the distinct ancestors of Neanderthals and modern humans, according to a presentation here yesterday at the fifth annual meeting of the European Society for the study of human evolution.

Ever since researchers first discovered thousands of bones and teeth from 28 individuals in the mid-1990s from Sima de los Huesos (“pit of bones”), a cave in the Atapuerca Mountains of Spain, they had noted that the fossils looked a lot like primitive Neanderthals. The Sima people, who lived before Neanderthals, were thought to have emerged in Europe. Yet their teeth, jaws, and large nasal cavities were among the traits that closely resembled those of Neanderthals, according to a team led by paleontologist Juan-Luis Arsuaga of the Complutense University of Madrid. As a result, his team classified the fossils as members of Homo heidelbergensis, a species that lived about 600,000 to 250,000 years ago in Europe, Africa, and Asia. Many researchers have thought H. heidelbergensis gave rise to Neanderthals and perhaps also to our species, H. sapiens, in the past 400,000 years or so.

But in 2013, the Sima fossils’ identity suddenly became complicated when a study of the maternally inherited mitochondrial DNA (mtDNA) from one of the bones revealed that it did not resemble that of a Neanderthal. Instead, it more closely matched the mtDNA of a Denisovan, an elusive type of extinct human discovered when its DNA was sequenced from a finger bone from Denisova Cave in Siberia. That finding was puzzling, prompting researchers to speculate that perhaps the Sima fossils had interbred with very early Denisovans or that the “Denisovan” mtDNA was the signature of an even more ancient hominin lineage, such as H. erectus. At the time, researchers at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, who had obtained the mtDNA announced that they would try to sequence the nuclear DNA of the fossils to solve the mystery.

After 2 years of intense effort, paleogeneticist Matthias Meyer of the Max Planck Institute for Evolutionary Anthropology has finally sequenced enough nuclear DNA from fossils of a tooth and a leg bone from the pit to solve the mystery. The task was especially challenging because the ancient DNA was degraded to short fragments, made up of as few as 25 to 40 single nucleotides. (Nucleotides—also known as base pairs—are the building blocks of DNA.) Although he and his colleagues did not sequence the entire genomes of the fossils, Meyer reported at the meeting that they did get 1 million to 2 million base pairs of ancient nuclear DNA.

They scanned this DNA for unique markers found only in Neanderthals or Denisovans or modern humans, and found that the two Sima fossils shared far more alleles—different nucleotides at the same address in the genome—with Neanderthals than Denisovans or modern humans. “Indeed, the Sima de los Huesos specimens are early Neanderthals or related to early Neanderthals,” suggesting that the split of Denisovans and Neanderthals should be moved back in time, Meyer reported at the meeting.

Researchers at the meeting were impressed by this new breakthrough in ancient DNA research. “This has been the next frontier with ancient DNA,” says evolutionary biologist Greger Larson of the University of Oxford in the United Kingdom.

The close affinity with Neanderthals, but not with Denisovans or modern humans, suggests that the lineage leading to Neanderthals was separate from other archaic humans earlier than most researchers have thought. That means that the ancestors of modern humans also had to split earlier than expected from the population that gave rise to Neanderthals and Denisovans, who were more closely related to each other than they were to modern humans. (Although all three groups interbred at low levels after their evolutionary paths diverged—and such interbreeding may have been the source of the Denisovan mtDNA in the first Sima fossil whose DNA was sequenced.) Indeed, Meyer suggested in his talk that the ancestors of H. sapiens may have diverged from the branch leading to Neanderthals and Denisovans as early as 550,000 to 765,000 years ago, although those results depend on different mutation rates in humans and are still unpublished.

That would mean that the ancestors of humans were already wandering down a solitary path apart from the other kinds of archaic humans on the planet 100,000 to 400,000 years earlier than expected. “It resolves one controversy—that they’re in the Neanderthal clade,” says paleoanthropologist Chris Stringer of the Natural History Museum in London. “But it’s not all good news: From my point of view, it pushes back the origin of H. sapiens from the Neanderthals and Denisovans.” The possibility that humans were a distinct group so early shakes up the human family tree, promising to lead to new debate about when and where the branches belong.

Author: Ann Gibbons | Source: ScienceMag/AAAS [September 11, 2015]

Our ancestors evolved three times faster in the 10 million years after the extinction of the dinosaurs than in the previous 80 million years, according to UCL researchers.

The team found the speed of evolution of placental mammals -- a group that today includes nearly 5000 species including humans -- was constant before the extinction event but exploded after, resulting in the varied groups of mammals we see today.

Lead researcher, Dr Thomas Halliday (UCL Genetics, Evolution & Environment), said: "Our ancestors -- the early placental mammals - benefitted from the extinction of non-avian dinosaurs and dwindling numbers of competing groups of mammals. Once the pressure was off, placental mammals suddenly evolved rapidly into new forms.

"In particular, we found a group called Laurasiatheria quickly increased their body size and ecological diversity, setting them on a path that would result in a modern group containing mammals as diverse as bats, cats, rhinos, whales, cows, pangolins, shrews and hedgehogs."

The team found that the last common ancestor for all placental mammals lived in the late Cretaceous period, about three million years before the non-avian dinosaurs became extinct 66 million years ago. This date is 20 million years younger than suggestions from previous studies which used molecular data from living mammals and assumed a near-constant rate of evolution.

In this study, funded by the Natural Environment Research Council and published in >Proceedings B of the Royal Society, the researchers analysed fossils from the Cretaceous to the present day, and used the dates of their occurrence in the fossil record to estimate the timing of divergences based on an updated tree of life. The new tree was released by the same team in 2015 and has the largest representation of Paleocene mammals to date.

The scientists measured all the small changes in the bones and teeth of 904 placental fossils and mapped the anatomical differences between species on the tree of life. From measuring the number of character changes over time for each branch, they found the average rate of evolution for early placental mammals both before and after the dinosaur extinction event. They compared the average rate of evolution over the geological stages before the extinction and the geological stages after to see what impact it had.

Senior author, Professor Anjali Goswami (UCL Genetics, Evolution & Environment and UCL Earth Sciences), said: "Our findings refute those of other studies which overlooked the fossils of placental mammals present around the last mass extinction. Using rigorous methods, we've successfully tracked the evolution of early placental mammals and reconstructed how it changed over time. While the rate differed between species, we see a clear and massive spike in the rates of evolution straight after the dinosaurs become extinct, suggesting our ancestors greatly benefitted from the demise of the dinosaurs. The huge impact of the dinosaur extinction on the evolution of our ancestors really shows how important this event was in shaping the modern world."

Professor Paul Upchurch (UCL Earth Sciences), co-author of the study, added: "Our large and refined data set allows us to build a clearer picture of evolutionary history. We plan on using it to study other large-scale evolutionary patterns such as how early placental mammals dispersed across the continents via land bridges that no longer exist today."

Source: University College London [June 28, 2016]

The Australian Age of Dinosaurs Museum today announced the naming of Savannasaurus elliottorum, a new genus and species of dinosaur from western Queensland, Australia. The bones come from the Winton Formation, a geological deposit approximately 95 million years old.

Savannasaurus was discovered by David Elliott, co-founder of the Australian Age of Dinosaurs Museum, while mustering sheep in early 2005. As Elliott recalled yesterday, "I was nearly home with the mob -- only about a kilometre from the yards -- when I spotted a small pile of fossil bone fragments on the ground. I was particularly excited at the time as there were two pieces of a relatively small limb bone and I was hoping it might be a meat-eating theropod dinosaur." Mr Elliott returned to the site later that day to collect the bone fragments with his wife Judy, who 'clicked' two pieces together to reveal a complete toe bone from a plant-eating sauropod. The Elliotts marked the site and made arrangements to hold a dig later that year.

The site was excavated in September 2005 by a joint Australian Age of Dinosaurs (AAOD) Museum and Queensland Museum team and 17 pallets of bones encased in rock were recovered. After almost ten years of painstaking work by staff and volunteers at the AAOD Museum, the hard siltstone concretion around the bones was finally removed to reveal one of the most complete sauropod dinosaur skeletons ever found in Australia. More excitingly, it belonged to a completely new type of dinosaur.

The new discovery was nicknamed Wade in honour of prominent Australian palaeontologist Dr Mary Wade. "Mary was a very close friend of ours and she passed away while we were digging at the site," said Mr Elliott. "We couldn't think of a better way to honour her than to name the new dinosaur after her."

"Before today we have only been able to refer to this dinosaur by its nickname," said Dr Stephen Poropat, Research Associate at the AAOD Museum and lead author of the study. "Now that our study is published we can refer to Wade by its formal name, Savannasaurus elliottorum," Dr Poropat said. "The name references the savannah country of western Queensland in which it was found, and honours the Elliott family for their ongoing commitment to Australian palaeontology."

In the same publication, Dr Poropat and colleagues announced the first sauropod skull ever found in Australia. This skull, and the partial skeleton with which it was associated, has been assigned to Diamantinasaurus matildae -- a sauropod dinosaur named in 2009 on the basis of its nickname Matilda. "This new Diamantinasaurus specimen has helped to fill several gaps in our knowledge of this dinosaur's skeletal anatomy," said Poropat. "The braincase in particular has allowed us to refine Diamantinasaurus' position on the sauropod family tree."

Dr Poropat collaborated with British sauropod experts Dr Philip Mannion (Imperial College, London) and Professor Paul Upchurch (University College, London), among others, to work out the position of Savannasaurus (and refine that of Diamantinasaurus) on the sauropod family tree. "Both Savannasaurus and Diamantinasaurus belong to a group of sauropods called titanosaurs. This group of sauropods includes the largest land-living animals of all time," said Dr Mannion. "Savannasaurus and the new Diamantinasaurus specimen have helped us to demonstrate that titanosaurs were living worldwide by 100 million years ago."

Poropat and his colleagues suggest that the arrangement of the continents, and the global climate during the middle part of the Cretaceous Period, enabled titanosaurs to spread worldwide.

"Australia and South America were connected to Antarctica throughout much of the Cretaceous," said Professor Upchurch. "Ninety-five million years ago, at the time that Savannasaurus was alive, global average temperatures were warmer than they are today. However, it was quite cool at the poles at certain times, which seems to have restricted the movement of sauropods at polar latitudes. We suspect that the ancestor of Savannasaurus was from South America, but that it could not and did not enter Australia until approximately 105 million years ago. At this time global average temperatures increased allowing sauropods to traverse landmasses at polar latitudes."

Savannasaurus was a medium-sized titanosaur, approximately half the length of a basketball court, with a long neck and a relatively short tail. "With hips at least one metre wide and a huge barrel-like ribcage, Savannasaurus is the most rotund sauropod we have found so far -- even more so than the somewhat hippopotamus-like Diamantinasaurus," said Dr Poropat. "It lived alongside at least two other types of sauropod (Diamantinasaurus and Wintonotitan), as well as other dinosaurs including ornithopods, armoured ankylosaurs, and the carnivorous theropod Australovenator."

Mr Elliott is relieved that Wade can now join "Matilda" and the other new dinosaur species on display in the Museum's Holotype Room. "That this dinosaur specimen can now be displayed for our visitors is a testament to the efforts of numerous volunteers who have worked at the Museum on the fossils over the past decade," he said. Mr Elliott and Dr Poropat agree that the naming of Savannasaurus, the fourth new species published by the AAOD Museum, is just the tip of the iceberg with respect to the potential for new dinosaur species in western Queensland.

"The Australian Age of Dinosaurs Museum has a massive collection of dinosaur fossils awaiting preparation and the number of specimens collected is easily outpacing the number being prepared by volunteers and staff in our Laboratory," Mr Elliott said. "The Museum already has the world's largest collection of bones from Australia's biggest dinosaurs and there is enough new material to keep us working for several decades."

The paper naming the new dinosaur was published in >Scientific Reports.

Source: Australian Age of Dinosaurs Museum of Natural History [October 20, 2016]

A single entry of the plague bacterium into Europe was responsible for the Black Plague of the mid-14th century. This same strain sparked recurrent outbreaks on the continent over the following four centuries before spreading to China, where it triggered the third plague pandemic in the late 19th century. The wave of plague that traveled to Asia later became the source population for modern-day epidemics around the globe. The bacterium's routes over time were revealed by genome analyses published in >Cell Host & Microbe.

"Our study is the first to provide genetic support for plague's travel from Europe into Asia after the Black Death, and it establishes a link between the Black Death in the mid-14th century and modern plague," says first author Maria Spyrou of the Max Planck Institute for the Science of Human History.

The plague bacterium, Yersinia pestis, is one of the deadliest pathogens in human history, sparking three major pandemics: the Plague of Justinian, which struck the Roman Empire during the 6th and 8th centuries; the second plague pandemic, which first erupted in Europe in the mid-14th-century Black Death and continued to strike the continent in recurrent outbreaks until the mid-18th century; and the third plague pandemic, which emerged in China during the late 19th century.

Evidence based on ancient DNA samples and historical climate patterns has suggested that the recurrent outbreaks of the second pandemic were caused by multiple reintroductions of Yersinia pestis into Europe, most likely from Asia. Moreover, some scientists have recently suggested that the plague bacterium migrated from Europe to Asia after the Black Death, later giving rise to the third pandemic. But until now, genomic evidence to support this model was missing.

To shed light on the origin and path of the second pandemic, Spyrou and co-senior study authors Alexander Herbig, Kirsten Bos, and Johannes Krause of the Max Planck Institute for the Science of Human History collected samples from plague-infected individuals buried in mass grave sites in Barcelona, Spain, and Ellwangen, Germany, as well as a single grave in Bolgar City, Russia.

"The mass burials where our samples come from often represent events where hundreds of people died of plague during a single outbreak," Herbig says. "This gives us an impression about how significant the impact of this disease was during medieval times."

The Bolgar City site was dated to the second half of the 14th century using coin artifacts known to have been minted after 1362. Radiocarbon dates from bone fragments and tooth roots were estimated at 1300-1420 for Barcelona, 1298-1388 for Bolgar City, and 1486-1627 for Ellwangen.

After analyzing DNA extracts from the teeth of 178 individuals, the researchers identified Y. pestis DNA in extracts from 32 individuals. Three individuals from Barcelona, Bolgar City, and Ellwangen had sufficient Y. pestis DNA for genome-level analysis. The researchers sequenced the genomes of these three ancient Y. pestis strains and compared them to 148 previously sequenced ancient and modern strains to reconstruct the Y. pestis phylogenetic tree.

The phylogenetic analysis revealed no differences between their Black Death strain from Barcelona and previously genotyped strains from mid-14th-century London. The simultaneous presence of the same strain in both southern and northern Europe suggests that Y. pestis entered the continent in a single wave rather than through multiple pulses during the Black Death.

These Black Death strains from London and Barcelona gave rise to a branch containing the Ellwangen strain and previously sequenced 18th-century strains from the Great Plague of Marseille in France. Moreover, all three newly reconstructed genomes and previously sequenced genomes from the second plague grouped together in the same branch on the phylogenetic tree. Taken together, these findings suggest that a single Y. pestis lineage was responsible for the Black Death and subsequent second pandemic outbreaks throughout Europe.

Meanwhile, the Bolgar City strain shared similarities with the Black Death London strain as well as all modern strains. This finding supports the idea that one Y. pestis lineage traveled from Europe to Asia after the Black Death, later sparking the third pandemic and modern-day epidemics worldwide.

"Our most significant finding revealed a link between the Black Death and modern plague," Krause says. "Though several plague lineages exist in China today, only the lineage that caused the Black Death several centuries earlier left Southeast Asia in the late 19th century pandemic and rapidly achieved a near worldwide distribution."

In future studies, the researchers plan to gain additional insights into the entry and end points of the Black Death in Europe. They hope to expand their sample range and explore these regions further to better understand the route traveled by the disease, the evolutionary changes it acquired at different stages, and the toll it had on the human population.

"We hope that our findings will highlight the importance for more extensive sampling and sequencing of both ancient and modern plague isolates around the world, and open up new research themes regarding the role played by Europe and West Asia in plague's evolution and ecology," Bos says.

Source: Cell Press [June 09, 2016]

Archaeologists have uncovered an important Anglo-Saxon cemetery in an excavation in advance of a conservation and fishing lake and flood defence system at Great Ryburgh in Norfolk. The waterlogged conditions of the river valley led to the remarkable preservation of burials that are extremely rare in the archaeological record, including plank-lined graves and tree-trunk coffins dating from the 7th-9th century AD.

It is believed that this may have been the final resting place for a community of early Christians including a timber structure thought to be a church or chapel, of which there are few examples from this period. The wooden grave markers, east-west alignment of the coffins and the evident lack of grave goods all support the Christian origins of the cemetery.

Anglo-Saxon coffins seldom survive because wood decays over time. Until now, evidence of these amazing burials has largely consisted of staining in the ground from decayed wood, but archaeologists have been able to properly excavate these rare and fascinating coffins, graves and skeletons because they have been brilliantly preserved in the ground in a combination of acidic sand and alkaline water.

The 81 dug-out coffins discovered comprise oak trees split in two length-ways and hollowed out. This type of coffin is first seen in Europe in the Early Bronze Age and reappears in the early medieval period. From Britain they are mentioned in antiquarian records from the late 19th century, but this is the very first time they have been properly excavated and recorded by modern archaeologists.

We know that the burials, in hollowed out logs, were positioned in the lower half and the upper half rested on top to form a lid. Although they aren’t decorative, it would have taken considerable effort to hollow a single coffin, an estimated four man days. The fact that evidence for similar burial rites is also found in earlier cemeteries may signify the blending of pagan and Christian traditions.

The six plank-lined graves are very rare in in this country and these are believed to be the earliest known examples from Britain. The graves were cut into the ground, lined with expertly hewn timber planks, the body placed inside and planks positioned on top to form a cover.

The relationship between the two burial types is not fully understood, but may denote an evolution in burial practices. Tree-ring dating is being undertaken to date the timber. The discovery is shedding light on a previously unknown religious site and the fascinating lives of this early Christian rural community.

Middle Saxon burial with wooden coffin by MOLA on Sketchfab
Continued research and scientific testing, in the form of ancient DNA, stable isotope and dental calculus analysis, will help to develop biographies for the people buried and paint a picture of the people who lived here.

Archaeologists hope to be able to say more about where these people came from, whether they were related, and what their diet and health were like, once research is complete.

Source: Museum of London Archaeology [November 16, 2016]

Photosynthesis is the process by which plants, algae and cyanobacteria use the energy from the Sun to make sugar from water and carbon dioxide, releasing oxygen as a waste product. But a few groups of bacteria carry out a simpler form of photosynthesis that does not produce oxygen, which evolved first.

A new study by an Imperial researcher suggests that this more primitive form of photosynthesis evolved in much more ancient bacteria than scientists had imagined, more than 3.5 billion years ago.

Photosynthesis sustains life on Earth today by releasing oxygen into the atmosphere and providing energy for food chains. The rise of oxygen-producing photosynthesis allowed the evolution of complex life forms like animals and land plants around 2.4 billion years ago.

However, the first type of photosynthesis that evolved did not produce oxygen. It was known to have first evolved around 3.5-3.8 billion years ago, but until now, scientists thought that one of the groups of bacteria alive today that still uses this more primate photosynthesis was the first to evolve the ability.

But the new research reveals that a more ancient bacteria, that probably no longer exists today, was actually the first to evolve the simpler form of photosynthesis, and that this bacteria was an ancestor to most bacteria alive today.

"The picture that is starting to emerge is that during the first half of Earth's history the majority of life forms were probably capable of photosynthesis," said study author Dr Tanai Cardona, from the Department of Life Sciences at Imperial College London.

The more primitive form of photosynthesis is known as anoxygenic photosynthesis, which uses molecules such as hydrogen, hydrogen sulfide, or iron as fuel -- instead of water.

Traditionally, scientists had assumed that one of the groups of bacteria that still use anoxygenic photosynthesis today evolved the ability and then passed it on to other bacteria using horizontal gene transfer -- the process of donating an entire set of genes, in this case those required for photosynthesis, to unrelated organisms.

However, Dr Cardona created an evolutionary tree for the bacteria by analyzing the history of a protein essential for anoxygenic photosynthesis. Through this, he was able to uncover a much more ancient origin for photosynthesis.

Instead of one group of bacteria evolving the ability and transferring it to others, Dr Cardona's analysis reveals that anoxygenic photosynthesis evolved before most of the groups of bacteria alive today branched off and diversified. The results are published in the journal PLOS ONE.

"Pretty much every group of photosynthetic bacteria we know of has been suggested, at some point or another, to be the first innovators of photosynthesis," said Dr Cardona. "But this means that all these groups of bacteria would have to have branched off from each other before anoxygenic photosynthesis evolved, around 3.5 billion years ago.

"My analysis has instead shown that anoxygenic photosynthesis predates the diversification of bacteria into modern groups, so that they all should have been able to do it. In fact, the evolution of oxygneic photosynthesis probably led to the extinction of many groups of bacteria capable of anoxygenic photosynthesis, triggering the diversification of modern groups."

To find the origin of anoxygenic photosynthesis, Dr Cardona traced the evolution of BchF, a protein that is key in the biosynthesis of bacteriochlorophyll a, the main pigment employed in anoxygenic photosynthesis. The special characteristic of this protein is that it is exclusively found in anoxygenic photosynthetic bacteria and without it bacteriochlorophyll a cannot be made.

By comparing sequences of proteins and reconstructing an evolutionary tree for BchF, he discovered that it originated before most described groups of bacteria alive today.

Author: Hayley Dunning | Source: Imperial College London [March 15, 2016]

An international research partnership is revealing the first mosasaur fossil of its kind to be discovered in Japan. Not only does the 72-million-year-old marine reptile fossil fill a biogeographical gap between the Middle East and the eastern Pacific, but also it holds new revelations because of its superior preservation. This unique swimming lizard, now believed to have hunted on glowing fish and squids at night, is detailed in an article led by Takuya Konishi, a University of Cincinnati assistant professor of biological sciences. The article is published in the Journal of Systematic Palaeontology, a publication of the Natural History Museum in London.

The fossil marine reptile, Phosphorosaurus ponpetelegans (a phosphorus lizard from an elegant creek), existed during the Late Cretaceous Period just before the last of the dinosaurs such as Tyrannosaurus and Triceratops. Compared with some of their mosasaur cousins that could grow as large as 40 feet, this species is relatively small, about 3 meters, or 10 feet long. This unique discovery in a creek in the town of Mukawa in northern Japan reveals that they were able to colonize throughout the northern hemisphere.

"Previous discoveries of this particular rare mosasaur have occurred along the East Coast of North America, the Pacific Coast of North America, Europe and North Africa, but this is the first to fill the gap between the Middle East and the Eastern Pacific," explains Konishi, a member of the research team that also was represented by the Royal Tyrrell Museum of Palaeontology (Canada), University of Alberta, Brandon University, Hobetsu Museum (Japan), Fukuoka University and the town of Mukawa.

Because the fossil was so well preserved, the creature revealed it had binocular vision -- its eyes were on the front of the face, providing depth perception. This was a new discovery for this fossil species. The discovery reveals that the eye structure of these smaller mosasaurs was different from their larger cousins, whose eyes were on either side of their large heads, such as the eye structure of a horse. The eyes and heads of the larger mosasaurs were shaped to enhance streamlined swimming after prey that included fish, turtles and even small mosasaurs.

"The forward-facing eyes on Phosphorosaurus provide depth perception to vision, and it's common in birds of prey and other predatory mammals that dwell among us today," says Konishi. "But we knew already that most mosasaurs were pursuit predators based on what we know they preyed upon -- swimming animals. Paradoxically, these small mosasaurs like Phosphorosaurus were not as adept swimmers as their larger contemporaries because their flippers and tailfins weren't as well developed."

As a result, Konishi says it's believed these smaller marine reptiles hunted at night, much like the owl does compared with the daytime birds of prey such as eagles. The binocular vision in nocturnal animals doubles the number of photoreceptors to detect light. And, much like owls with their very large eyes to power those light receptors, the smaller mosasaur revealed very large eye sockets.

Also, because fossils of lantern fish and squid-like animals have been found from the Late Cretaceous Period in northern Japan, and because their modern counterparts are bioluminescent, the researchers believe that Phosphorosaurus may have specifically targeted those glowing fish and squids at night while their larger underwater cousins hunted in daytime.

"If this new mosasaur was a sit-and-wait hunter in the darkness of the sea and able to detect the light of these other animals, that would have been the perfect niche to coexist with the more established mosasaurs," says Konishi.

Painstaking Preservation

The fossil, enclosed in a rock matrix, was first discovered in 2009, in a small creek in northern Japan. Revealing what was inside the matrix while protecting the fossil was a painstaking process that took place at the Hobetsu Museum in Mukawa. The calcareous nodule would be dipped at night in a special acid wash, and then carefully rinsed the next day, as the two-year process freed the bones from the matrix. To further protect the fossil, special casts were made of the bones so that the researchers could piece together the remains without damaging the fossil.

"It's so unusually well-preserved that, upon separating jumbled skull bones from one another, we were able to build a perfect skull with the exception of the anterior third of the snout," says Konishi. "This is not a virtual reality reconstruction using computer software. It's a physical reconstruction that came back to life to show astounding detail and beautiful, undistorted condition."

Future Research

Konishi says future research will examine how this new mosasaur fits in the evolutionary family tree of mosasaurs.

Author: Dawn Fuller | Source: University of Cincinnati [December 08, 2015]

With “Jurassic World” hitting theaters next weekend, it seems like everyone’s got “dino fever” these days. This includes the folks at the National Geographic Channel, who are cashing in on the craze with “T. rex Autopsy,” which features a dissection of the world’s first anatomically correct synthetic Tyrannosaurus Rex. Performing the autopsy are a veterinary surgeon and three leading paleontologists, including University of Edinburgh Chancellor’s Fellow Stephen Brusatte.

“I've been studying T. rex for a decade, but all we really have to go by are bones,” Brusatte told FoxNews.com. “Up until now, my mental image of T. rex has been that of a skeleton, of the bones I study. Now my image is of the incredible model that we built for the program.”

To create the 46–foot long, 880–pound model (the real dinosaurs weighed over 7 tons), England–based special effects house Crawley Creatures consulted some of the world’s leading dinosaur experts, including Brusatte.

“I think the life-sized model that we built for the show is the single most realistic and accurate dinosaur that has ever been assembled,” he said. “It is based on everything we know about T. rex from fossils, with the unknowns filled in by reasonable inference to living crocs (close dinosaur cousins) and birds (living dinosaurs).”

The team used latex rubber, polyurethane foam, silicone rubber, polystyrene, and glass reinforced plastic to create the model, along with 34 gallons of fake blood. They had to get a bit more creative when it came to some of the other details. For example, the feces were made from oatmeal, coffee, and synthetic “badger poo.” In total, it took 1,000 man–hours for the effects house to complete the project.

The four participants weren’t allowed to see the finished product until cameras were rolling at Pinewood Studios in London. Brusatte said that their shocked reactions were completely genuine.

“I consulted on the model-making process, but I never actually saw the physical model as it was being constructed,” he recalled. “There was a fog machine, and the door opened and we walked through the fog to go face–to–face with this life–sized T. rex corpse. I was speechless. The model is beautiful, accurate, and really nails what I think T. rex looked like in the flesh.”

Once over the initial shock, the four had to figure out the synthetic creature’s age, sex and cause of death. For the dissection, they were given a variety of instruments, including a chainsaw. This came in handy when a leg had to be removed to figure out the dino’s age. Fun fact — like a tree, the age of a tyrannosaur can be told from the rings in its bones.

Later, the team had to slice open the belly and through the rib cage to get to the innards inside — a bloody, smelly, and (according to Brusatte) fun process.

“I would have to say my favorite part was when I was literally able to crawl into the belly of the beast and help remove some of the organs, and then poke around to try to figure out whether it was a boy or girl dinosaur. A ‘he rex’ or a ‘she rex,’ ” he said. “Being inside the belly really drove home how enormous T. rex was.”

While performing an autopsy on a life-like synthetic Tyrannosaur makes for entertaining and informative television for the viewers at home, what can the researchers get out of it themselves in terms of their research? Can these kinds of autopsies help scientists gain knowledge about dinosaurs in any way?

“Not really,” Brusatte said, but added that this wasn’t the point of the project.

“I've spent years of my life studying bones — observing, measuring, photographing, [and] describing them,” he explained. “Bones tell you a lot, but there can be a disconnect between bones and a living animal. Taking part in “T. rex Autopsy,” and cutting up the life-sized model, helped me visualize how a real T. rex all fit together– not only the bones, but the muscles, skin, feathers, internal organs.

“The gut was a little bigger than I thought, the teeth even more menacing on a fleshed-out skull, the internal organs much more massive than I imagined before. I will carry this image with me forever,” he added.

“We'll never be able to observe a real T. rex, or ever bring one back through DNA cloning, so I think this model is the closest we're ever going to get,” Brusatte said. “And it's great.”

T. Rex Autopsy premiered on Sunday 7 June, 8pm on National Geographic Channel.

Author: Walt Bonner | Source: FoxNews [June 08, 2015]

When the Black Death swept through Europe in 1347, it was one of the deadliest disease outbreaks in human history, eventually killing between a third and half of Europeans.

Prior work by investigators has traced the cause to plague-carrying fleas borne by rats that jumped ship in trading ports. In addition, historical researchers believe that famine in northern Europe before the plague came ashore may have weakened the population there and set the stage for its devastation.

Now, new research using a unique combination of ice-core data and written historical records indicates that the cool, wet weather blamed for the northern European famine actually affected a much wider area over a much longer period. The work, which researchers say is preliminary, paints a picture of a deep, prolonged food shortage in the years leading to the Black Death.

“The evidence indicates that the famine was a broader phenomenon, geographically and chronologically,” said Alexander More, a postdoctoral fellow in the Harvard History Department and a lecturer in the History of Science Department.

A widespread famine that weakened the population over decades could help explain the Black Death’s particularly high mortality. Over four or five years after arriving in Europe in 1347, the pandemic surged through the continent in waves that killed millions.

The ice-core data is part of a unique program linking traditional historical research with scientific data-collecting techniques. The program, called the Initiative for the Science of the Human Past at Harvard (SoHP), is headed by Michael McCormick, the Francis Goelet Professor of Medieval History. SoHP’s ice-core project is being conducted in collaboration with the University of Maine’s Climate Change Institute and researchers at Heidelberg University. The project’s approach puts it at the juncture of environmental science, archaeology, and history. It is supported by the Arcadia Fund of London.

More presented his findings at a conference in November arranged to discuss the project. Joining him was Harvard junior Matthew Luongo, an Earth sciences and environmental engineering concentrator from Dunster House, who discussed the discovery of volcanic tephra in the ice core. Tephra, microscopic airborne volcanic particles, are generally believed absent from cores in European glaciers, make Luongo’s assumption-puncturing discovery potentially significant.

Luongo spent several days at the Climate Change Institute last summer performing chemical analyses and examining the volcanic bits through a scanning electron microscope. Each volcanic eruption has a slightly different chemical fingerprint, so he was able to trace the tephra to the 1875 Askja eruption in Iceland, one of the largest eruptions there in history.

Since many eruptions were written about contemporaneously, the ice core’s volcanic traces can be used to align ice-core data with written records, providing greater certainty in dating other chemical traces in the ice, such as those from human activities like lead from Roman-era smelting.

“I think it was a really important project,” Luongo said.

McCormick said that the advanced technologies scientists used to understand areas like the human genome and climate change are increasingly being applied to the humanities, and opening new avenues of investigation.

McCormick was part of a team that in 2011 used tree-ring data to reconstruct European climate over the last 2,500 years, showing that the period before the fall of the Roman Empire was marked by wide climactic variability. In November, McCormick summed up the use of climate data in historical research as reading history “from the environment itself.”

“All these things are happening in the sciences and spilling over into the humanities,” McCormick said. “Twenty years ago, if you’d have told me that climate could have caused the collapse of the Roman Empire and that we would have the means to test that, I wouldn’t have believed you.”

The new data emerging from the ice core could be the first of a flood of information about the last millennium and beyond. McCormick’s University of Maine colleagues, led by Paul Mayewski, have developed a laser-based method of ice analysis. It requires far smaller samples of ice and can take 50,000 samples in a one-meter ice core, compared with just 100 in the previous method. The new technology allows much higher resolution analysis of even very thin ice layers — to the specific year and potentially to individual storms — and can go back farther than the 1500 A.D. limit of this glacier with previous techniques.

The ice core was the first ever taken specifically for historical research, McCormick said, and was drilled in 2013 from the Colle Gnifetti glacier, high in the Alps near the Swiss-Italian border. It was divided between partner organizations, with the portion allocated to the Initiative for the Science of the Human Past and the Climate Change Institute being held at the University of Maine.

The findings about the period preceding the Black Death described by More continue to fill in an emerging and newly complex picture of a key period in human history. Recent research has traced the genesis of the European plague to animal groups in Asia and climate-related outbreaks that traveled along Silk Road trade routes.

McCormick said this application of scientific methods opens new avenues of inquiry, akin to discovering colossal collections of historical records, whether read directly from the DNA of ancient people, from the trees that grew at the time, or from the ice deposited in ancient storms.

“It’s a gigantic set of archives that document the least-documented part of [history],” McCormick said. “It’s kind of a renaissance of history.”

Author: Alvin Powell | Source: Harvard University [January 07, 2016]

When members of the BaYaka Pygmies living in the northern Republic of Congo get sick, they don't just go to the doctor for a prescription. Instead, they rely on their shared knowledge of medicinal plants to help them get well. Now, researchers reporting in the Cell Press >journal Current Biology on September 8 have examined shared uses of those plants to understand how Pygmies have passed their extensive plant knowledge along from one person to the next.

The findings show the important role of marital bonds in passing information to otherwise distant families. There were some surprises, too.

"I wasn't expecting that plant uses would be so diverse," says Gul Deniz Salali (@DenizSalali) of University College London. She hadn't expected to find that plants would play an important role in executing social norms, either. "But many Pygmies told me that they used particular plants to detect and punish cheaters."

Salali was interested in exploring how hunter-gatherers accumulated the vast repertoire of plant uses that have helped them to survive in tropical rainforests. To find out, she and her colleagues examined the reported co-occurrence of plant uses between pairs of BaYaka Pygmy individuals based on extensively conducted interviews. Their study included reported uses of 33 different plants by 219 individuals living in four camps.

"We found that long-term pair bonds between men and women allowed otherwise distant families to combine information on medicinal uses of plants," Salali says. "Living in multi-family camps, on the other hand, enabled Pygmies to exchange and accumulate plant knowledge related to cooperative foraging and social beliefs."

The most commonly reported medicinal uses of plants were for treating digestive and respiratory disorders. The BaYaka also use some plants for collecting caterpillars or honey and as a poison for killing monkeys or fish. Other plants were used to regulate social life, including matters concerning lying or sexual taboos.

As an example, Salali says, some Pygmies use the juice extracted from a particular type of tree bark to detect and punish cheaters. "If someone cheated their partner, camp members would squeeze the poisonous juice into the person's eyes which could affect his or her vision. If his or her vision was affected, then people thought the person was guilty. I found that the knowledge on this type of plant use was widely shared among the campmates."

Knowledge of medicinal plants is mainly shared between spouses and other relatives, they found. But plant uses associated with foraging and social norms were often shared more widely among campmates, regardless of relatedness, playing an important role in camp-wide activities that require cooperation.

The researchers also found that BaYaka mothers who used more plants for treating certain diseases had healthier children.

Salali says her next step is to compare plant knowledge and use in hunter-gatherers living in varying proximity to market towns in Congo. "I have lived in some Pygmy camps that were located in the forest, and some larger ones that were located in a logging town," she says. "I am interested in exploring the biological and cultural adaptations of groups in transition from a nomadic hunter-gatherer lifestyle to a more sedentary farming way of life."

Source: Cell Press [September 08, 2016]

A team of researchers has discovered the fossil of a 305-million-year-old arachnid, which will help scientists to understand more about the early origins of modern-day spiders.

The new species, named Idmonarachne brasieri in honour of Professor Martin Brasier, University of Oxford, who passed away in December 2014, was found in Montceau-les-Mines, France, and researchers from The University of Manchester, Berlin's Museum fur Naturkunde, the University of Kansas and Imperial College London have worked with the Natural History Museum and the UK's Diamond Light Source to scan and examine the fossil in detail.

Details of the origins of spiders remain limited, with little knowledge of their predecessors and no insights into character acquisition early in their evolution. This fossil was preserved in 3D, which enabled the researchers to investigate its minute anatomical details.

We have known since 2008 that a group called the uraraneids were a sister group to true spiders -- they could make silk, but probably laid it down in sheets, rather than spinning it as modern spiders do. They also had a tail-like structure at the end called a flagellum.

Analysis of Idmonarachne brasieri suggests that as the spider lineage evolved, the animals lost their tail-like structure, and developed spider-like fangs and limbs. Whilst they could likely make silk, the ancestors lacked the ability to spin it using specialised appendages called spinnerets. These are the features that define true spiders, and give them more control over the use and distribution of silk.

Lead author Russell Garwood, of The University of Manchester's School of Earth, Atmospheric & Environmental Sciences, said, "Our new fossil occupies a key position in the evolution of spiders. It isn't a true spider, but has given us new information regarding the order in which the bits of the anatomy we associate with spiders appeared as the group evolved."

This is part of an ongoing effort to look at early arachnids, and see what this can tell us about the early evolution of the group, how they came onto land and what their evolutionary tree looks like. Arachnids as a whole are a very diverse group, but working out how they are all related to each other has proved a challenge. The authors hope that by better understanding these fossils, they can help fill in some of the blanks.

The discovery is published in the Proceedings of the Royal Society B.

Source: University of Manchester [March 31, 2016]

They came from every parish of London, and from all walks of life, and ended up in a burial ground called Bedlam. Now scientists hope their centuries-old skeletons can reveal new information about how long-ago Londoners lived - and about the bubonic plague that often killed them.

Archaeologists announced Monday that they have begun excavating the bones of some 3,000 people interred in the 16th and 17th centuries, who now lie in the path of the Crossrail transit line. They will be pored over by scientists before being reburied elsewhere.

One recent workday, just meters (yards) from teeming Liverpool Street railway station, researchers in orange overalls scraped, sifted and gently removed skeletons embedded in the dark earth. In one corner of the site, the skeleton of an adult lay beside the fragile remains of a baby, the wooden outline of its coffin still visible. Most were less intact, a jumble of bones and skulls.

"Part of the skill of it is actually working out which bones go with which," said Alison Telfer, a project officer with Museum of London Archaeology, which is overseeing the dig.

Due to open in 2018, the 118-kilometer (73-mile) trans-London Crossrail line is Britain's biggest construction project, and its largest archaeological dig for decades. The central 21-kilometer (13-mile) section runs underground, which has meant tunneling beneath some of the oldest and most densely populated parts of the city.

For Londoners, that has brought years of noise and disruption, but for archaeologists it's like Christmas. Almost every shovelful of earth has uncovered a piece of history, or prehistory: bison and mammoth bones; Roman horseshoes; medieval ice skates; the remains of a moated Tudor manor house.

Chief archaeologist Jay Carver says the Bedlam dig could be the most revealing yet.

"It's going to be archaeologically the most important sample we have of the population of London from the 16th and 17th centuries," Carver said.

Bedlam cemetery opened in 1569 to take the overspill as the city's churchyard burial grounds filled up. It is the final resting place of prosperous citizens and paupers, religious dissenters including the 17th-century revolutionary Robert Lockyer and patients from Bedlam Hospital, the world's first asylum for the mentally ill. The hospital's name, a corruption of Bethlehem, became a synonym for chaos.

Tests on the bones by osteologists may reveal where these Londoners came from, what they ate and what ailed them - which in many cases was the plague. There were four outbreaks of the deadly disease over the two centuries the cemetery was in use, including the "Great Plague" that killed 100,000 people in 1665.

Carver says researchers will analyze DNA taken from pulp in the skeletons' teeth to help fill in the "evolutionary tree of the plague bacteria."

The technique was used to discover the plague bacterium, Yersinia pestis, in 14th-century skeletons excavated at another Crossrail site, identifying them as victims of the Black Death that wiped out half the city's population in 1348.

Scientists should be able to compare the bacterium found in Bedlam's plague victims with the 14th-century samples, helping to understand whether the disease - which still infects several thousand people a year - has evolved over the centuries.

Sixty archaeologists working in shifts - 16 hours a day, six days a week - will spend about a month removing the remains. After scientific study, they will be reburied on Canvey Island in the Thames Estuary - the latest in a long line of Londoners to move east out of the congested city.

The old burial ground will be the site of a new train station, whose users will probably give little thought to the history beneath their feet.

But Telfer says she never forgets that these fragile bones were once living, breathing individuals.

"When you are doing something like this, you do feel a connection with them," she said. "I think you have a responsibility to treat them with great respect. It's quite a special process."

Bedlam burial register: http://www.crossrail.co.uk/sustainability/archaeology/bedlam-burial-ground-register

Author: Jill Lawess | Source: The Associated Press [March 09, 2015]

While searching through historical archives to find out more about the 15th-century climate of what is now Belgium, northern France, Luxembourg, and the Netherlands, Chantal Camenisch noticed something odd. "I realised that there was something extraordinary going on regarding the climate during the 1430s," says the historian from the University of Bern in Switzerland.

Compared with other decades of the last millennium, many of the 1430s' winters and some springs were extremely cold in the Low Countries, as well as in other parts of Europe. In the winter of 1432-33, people in Scotland had to use fire to melt wine in bottles before drinking it. In central Europe, many rivers and lakes froze over. In the usually mild regions of southern France, northern and central Italy, some winters lasted until April, often with late frosts. This affected food production and food prices in many parts of Europe. "For the people, it meant that they were suffering from hunger, they were sick and many of them died," says Camenisch.

She joined forces with Kathrin Keller, a climate modeller at the Oeschger Centre for Climate Change Research in Bern, and other researchers, to find out more about the 1430s climate and how it impacted societies in northwestern and central Europe. Their results are published in >Climate of the Past, a journal of the European Geosciences Union.

They looked into climate archives, data such as tree rings, ice cores, lake sediments and historical documents, to reconstruct the climate of the time. "The reconstructions show that the climatic conditions during the 1430s were very special. With its very cold winters and normal to warm summers, this decade is a one of a kind in the 400 years of data we were investigating, from 1300 to 1700 CE," says Keller. "What cannot be answered by the reconstructions alone, however, is its origin -- was the anomalous climate forced by external influences, such as volcanism or changes in solar activity, or was it simply the random result of natural variability inherent to the climate system?"

There have been other cold periods in Europe's history. In 1815, the volcano Mount Tambora spewed large quantities of ash and particles into the atmosphere, blocking enough sunlight to significantly reduce temperatures in Europe and other parts of the world. But the 1430s were different, not only in what caused the cooling but also because they hadn't been studied in detail until now.

The climate simulations ran by Keller and her team showed that, while there were some volcanic eruptions and changes in solar activity around that time, these could not explain the climate pattern of the 1430s. The climate models showed instead that these conditions were due to natural variations in the climate system, a combination of natural factors that occurred by chance and meant Europe had very cold winters and normal to warm summers.

Regardless of the underlying causes of the odd climate, the 1430s were "a cruel period" for those who lived through those years, says Camenisch. "Due to this cluster of extremely cold winters with low temperatures lasting until April and May, the growing grain was damaged, as well as the vineyards and other agricultural production. Therefore, there were considerable harvest failures in many places in northwestern and central Europe. These harvest failures led to rising food prices and consequently subsistence crisis and famine.

Furthermore, epidemic diseases raged in many places. Famine and epidemics led to an increase of the mortality rate." In the paper, the authors also mention other impacts: "In the context of the crisis, minorities were blamed for harsh climatic conditions, rising food prices, famine and plague." However, in some cities, such as Basel, Strasbourg, Cologne or London, societies adapted more constructively to the crisis by building communal granaries that made them more resilient to future food shortages.

Keller says another decade of very cold winters could happen again. "However, such temperature variations have to be seen in the context of the state of the climate system. Compared to the 15th century we live in a distinctly warmer world. As a consequence, we are affected by climate extremes in a different way -- cold extremes are less cold, hot extremes are even hotter."

The team says their Climate of the Past study could help people today by showing how societies can be affected by extreme climate conditions, and how they should take precautions to make themselves less vulnerable to them. In the 1430s, people had not been exposed to such extreme conditions before and were unprepared to deal with the consequences.

"Our example of a climate-induced challenge to society shows the need to prepare for extreme climate conditions that might be coming sooner or later," says Camenisch. "It also shows that, to avoid similar or even larger crises to that of the 1430s, societies today need to take measures to avoid dangerous anthropogenic climate interference."

Source: European Geosciences Union [December 01, 2016]

Clues to what became of North Carolina's fabled Lost Colony could lie in a waterfront tract where developers once wanted to build thousands of condos - and now, one of those would-be developers is seeking millions of dollars to preserve the property.

The effort to save the 1,000 acres in rural Bertie County is in an early stage. Even the environmental group that developer Michael Flannelly hopes will help hasn't seen the property yet. But Flannelly said he's optimistic that his vision will eventually become a reality.

"I want to see the site preserved," said Flannelly, who lives on a boat that's usually docked in Norfolk, Virginia, or near his land in Bertie County. "I think it would make a fantastic place for people to come."

The mystery of the Lost Colony - England's first settlement in North America - has intrigued historians and the popular imagination for centuries.

In 1587, 116 English settlers landed on Roanoke Island, led by explorer John White. He left them there when he sailed back to England that same year for more supplies. Delayed by war between England and Spain, he didn't return until 1590 - and when he did, he discovered the entire colony had simply vanished.

White knew the majority had planned to move "50 miles into the maine," as he wrote, referring to the mainland. The only clues he found about the fate of the other two dozen were the word "CROATOAN" carved into a post and "CRO" lettered on a tree trunk, leading historians to believe they moved south to live with American Indians on what's now Hatteras Island.

But some archaeologists now suspect that at least some of the Roanoke colonists found their way to the inland site south of the Chowan River bridge, roughly 50 miles from Roanoke. It first came to light in 2012, when researchers at the British Museum in London announced they had found a drawing of a fort that had been obscured under a patch on a map of Virginia and North Carolina drawn by White in the 1580s.

The drawing placed the fort in an area of Bertie County where archaeologists had found colonial-era English pottery and signs of a Native American village several years earlier during a dig that the state required before Flannelly and his partners could get permits for the subdivision that was never built. Archaeologists have since found further evidence on the tract, dubbed Site X, including bale seals used to verify cloth quality and 16th-century nails.

Before the site can be preserved, Flannelly must buy out his former development partners.

Flannelly estimates it will take $4 million to $5 million, along with a conservation group willing to help raise the money and preserve the land. To any cynics who suspect Flannelly is doing this only for the money, he says he would get 8 percent of any sale, plus a tax credit. And the proposed buyout is far less than the $10 million Flannelly says the developers paid for the property.

A spokesman for the company, Forest City, said in an email that officials know about the archaeological finds but have no other updates about the status of the property. Forest City no longer works in land development, spokesman Jeff Linton said.

Flannelly said that when archaeologists uncovered the property's historical significance, he insisted that those areas be cordoned off as green space and not developed.

Flannelly personally owns 15 acres that include the possible Lost Colony site, but said he didn't know about the artifacts when he chose that land for his own home. "They felt the same I did," he said of the settlers. "That's the best piece of property on the whole tract."

He has turned to North Carolina's Coastal Land Trust, a nonprofit that has preserved more than 65,000 undeveloped acres in 31 counties since 1992. Lee Leidy, attorney and northeast regional director for the trust, said officials there hope to view the property later this month.

"It's fascinating," she said. "It's one that we're very excited to take a look at and learn more about."

But raising funds to preserve the land presents a challenge, since limited conservation dollars must cover many projects, she said.

"If it's done properly, I think it could be tremendous," said Arwin Smallwood, who wrote "Bertie County: An Eastern North Carolina History" and chairs the history department at N.C. A&T State University in Greensboro. "Right now in Bertie County, you can have a true sense of history and what the landscape was like."

Tourists travel by the thousands to Dare County, home of the outdoor performance of "The Lost Colony" at an outdoor amphitheater on Roanoke Island. Now Bertie County residents have adopted the settlers as their own as well. More than 300 people attended the town of Windsor's first Lost Colony Festival in April, said Billy Smithwick, the town fire chief and tourism manager. In addition, the county is acquiring 137 acres for a nearby park.

"I think it would be quite a tourist attraction," said Smithwick. "The Lost Colony is the greatest mystery in history that there is."

Author: Martha Waggoner | Source: Associated Press [July 22, 2016]

In the summer of 430 B.C., a mass outbreak of disease hit the city of Athens, ravaging the city’s population over the next five years. In his History of the Peloponnesian War, the historian Thucydides, who witnessed the epidemic, described victims’ “violent heats in the head,” “redness and inflammation in the eyes,” and tongues and throats “becoming bloody and emitting an unnatural and fetid breath.” Patients would experience hot flashes so extreme, he wrote, that they “could not bear to have on [them] clothing or linen even of the very lightest description.” In the later stages of infection, the disease would end with “violent ulceration” and diarrhea that left most too weak to survive.

More than 2,000 years later, the Plague of Athens remains a scientific mystery. Thucydides’ account—the only surviving description of the epidemic—has been the basis for dozens of modern-day theories about its cause, including bubonic plague, cholera, typhoid fever, influenza, and measles. And in June, an article in the journal Clinical Infectious Disease suggested another answer: Ebola.

The article, written by the infectious-disease specialist Powel Kazanjian, is the latest in a string of papers arguing that Athens was once the site of an Ebola outbreak. The surgeon Gayle Scarrow first raised the suggestion in The Ancient History Bulletin in 1988. Eight years later, the epidemiologist Patrick Olson published a letter in Emerging Infectious Diseases, a journal of the Centers for Disease Control and Prevention, comparing the symptoms of the Athens plague to those of Ebola, which had broken out in the Democratic Republic of Congo (then Zaire) and Sudan in 1976. “The profile of the ancient disease,” he concluded, “is remarkably similar.”

But not everyone was on board with Olson’s theory. In a 1996 interview with the The New York Times, the epidemiologist David Morens argued that Thucydides wasn’t the most reliable source: Unlike his contemporary, Hippocrates, he wasn’t a physician, and many of the terms he used to describe the disease’s symptoms were ambiguous. For example, the ancient Greek phlyktainai could refer to either blisters or callouses. Noting Thucydides’ claim that the epidemic had originated “in the parts of Ethiopia above Egypt” (today’s sub-Saharan Africa), Morens also questioned how people with Ebola, a highly contagious and deadly disease, could make it all the way to Greece without dying along the way.

The duration of the Athens epidemic also presented another problem: At five years, it was much longer than any known Ebola outbreaks, the majority of which lasted less than a year. And finally, Morens asked, if Ebola had made it out of Africa millennia ago, why were there no other accounts of the disease re-appearing anywhere on Earth until 1976?

Unfortunately for both Olson and Morens, however, neither had a more concrete way to back up their arguments. Their efforts to identify the Plague of Athens, like all the other efforts before them, could only rely on the written record left by Thucydides, which made confirmation more or less impossible.

This, in a nutshell, is the challenge of ancient pathology: With DNA testing, it’s often possible to identify the cause of an epidemic that took place centuries or even millennia ago. Finding remains of those victims to test, though, is another story.

Sometimes, scientists get lucky. In 2001, for example, a mass grave was uncovered at a construction site in Vilnus, Lithuania. Based on uniform fragments found in the grave, the bodies were identified as belonging to soldiers in Napoleon’s army—somewhere between 2,000 and 3,000 of them, hurriedly buried during the retreat from Moscow. When a team of anthropologists examined dental pulp taken from the bodies, they found that around one-third of them had died of typhus, a finding confirmed by tests of dead lice found at the site (the disease is transmitted through lice). Researchers had long suspected that typhus had contributed to Napoleon’s eventual defeat, but because knowledge of the disease was scant during his lifetime, historical accounts alone had never been enough to confirm it.

For the Plague of Athens, it seemed like a similar turning point had arrived in 1994, when during excavations for a planned Athens metro station at Kerameikos, an ancient graveyard used from the early Bronze age through Roman times. The excavators uncovered thousands of previously undiscovered tombs—including a set of seemingly hurried, unceremonious mass burials dating to 430 B.C., the year of the Plague of Athens.

Control of the site was turned over from the construction company to the Greek Ministry of Culture, which handles the discoveries of ancient ruins. In 2000, archaeologists turned over three teeth found at the site to a University of Athens team led by Manolis Papagrigorakis, an orthodontist and professor of dentistry, for DNA testing. Examining the dental pulp found in the teeth, Papagrigorakis’ team ran tests for seven diseases that had previously been suggested by other scholars: plague, typhus, anthrax, tuberculosis, cowpox, cat-scratch disease, and typhoid fever. The only match they identified on all three teeth was with the pathogen for typhoid fever. The researchers published the findings from their analysis in the International Journal of Infectious Diseases in 2006.

Far from solving the mystery, though, Papagrigorakis’s team only muddled it further. In a letter to the editor in the same journal, zoologists from Oxford University and the University of Copenhagen argued that Papagrigorakis’s methodology was flawed because he failed to do a phylogenetic analysis (a way of examining evolutionary relationships) on the teeth. Using the DNA data published in Papagrigorakis’s study, they conducted their own phylogenetic analysis, concluding that the DNA of the tooth bacteria was related to, but not the same as, that of the pathogen for typhoid fever. “The Athens [DNA] sequence and typhoid would have shared a common ancestor in the order of millions of years ago,” they wrote.

The authors also suggested another possibility: that the DNA found in the teeth wasn’t from the Plague of Athens pathogen at all. “While we cannot exclude the possibility that the Athens sequence is a previously unidentified infectious agent,” they concluded, “it is quite reasonable to assume that the sequence is actually that of a modern, free-living soil bacterium, a possibility that could have been explored by extracting DNA from surrounding soil samples as additional negative controls.”

Papagrigorakis currently has a new study underway, using more modern techniques and a greater number of tooth samples, that he hopes will help to settle the debate. In the decade since he published his Athens study, advancements in DNA-sequencing technology have enabled scientists to answer a number of lingering questions about ancient epidemics, making new discoveries from very old tooth samples. In 2011, for example, scientists used teeth taken from bodies in one of London’s so-called “plague pits” to sequence the genome of the bacterium y. pestis, the source of the Black Death epidemic that had swept Europe in the 14th century. By comparing the old genome to modern-day strains, the researchers were able to reconstruct the bacterium’s evolutionary path over the centuries, finding support for the idea that the 14th-century pathogen was likely the root of the evolutionary tree leading to more recent outbreaks.

And in a 2014 study published in the Lancet Infectious Diseases, scientists were able to prove for the first time that the Plague of Justinian—which killed about 50 million people in Europe and the Byzantine Empire between 600 and 800 A.D.—was actually a strain of y. pestis, making it the first known outbreak. The team made its discovery by sequencing DNA from teeth taken from human remains that had been found in a German graveyard and dated to the time of the epidemic.

Even when ancient specimens are available, though, they may not be enough to identify a disease. Bacteria, like typhoid and plague, can be identified through DNA sampling, but this isn’t always the case with viruses. Many of them, including the viruses for Ebola, influenza, and measles, require an RNA sample for positive identification—and thus far, the oldest preserved RNA viral genome belongs to a 700-year-old specimen of caribou feces, much more recent than the Athens samples from in the 5th century B.C. The structure of RNA makes it much more unstable—and therefore more prone to degradation—than DNA, meaning that if the Plague of Athens was viral rather than bacterial, its source may remain a mystery.

“If Ebola virus was there, we will never know,” said Vinent Racaniello, a professor of microbiology at Columbia University professor and the host of the podcast This Week in Virology. “For that, we’ll need a time machine to bring us back to get samples.”

Partially due to these limitations, Kazanjian’s recent study doesn’t delve into dental-pulp analysis data. His argument is based on the similarity between the symptoms of the Plague of Athens and those of Ebola, an argument that he believes is strengthened by observations from the latest Ebola outbreak. The paper ends with a chart of the symptoms described by Thucydides, listed side-by-side against the symptoms of eight modern diseases that had previously been floated as possible explanations; of all of them, the symptoms for Ebola have the most overlap.

Even so, Kazanjian cautioned against referring to Ebola as a “probable” or even a “likely” cause. “The most accurate statement is that the cause remains unknown, and there are several possibilities,” he said, including that the Plague of Athens may have been a now-extinct disease with Ebola-like symptoms.

He also acknowledges the difficulty of making rigorous comparisons between Thucydides’s descriptions and modern-day medical knowledge: “I try not to get into the trap of saying what the most likely thing is,” he said.

But for Kazanjian—also a historian—solving the puzzle of the Plague of Athens is less compelling than exploring all the possibilities. The inquiry is “clearly fun to do,” he said, “no matter what your background is.”

Author: Simon Davis | Source: The Atlantic [September 16, 2015]