Humans Blamed for Extinction of Mammoths, Mastodons & Giant Sloths, in New Study
by Stephanie Pappas
The latest volley in a long-running debate over why woolly mammoths, giant sloths, mastodons and cave lions died out worldwide suggests that humans are to blame.

A new global look at the extinctions of large mammals over the past 130,000 years finds that the loss of species correlates more closely with the arrival of humans than with changes in climate, which some studies have cited as a possible culprit.
Nonetheless, the paper is unlikely to settle the debate over what really caused the Quaternary extinction, a die-off of large mammals worldwide at the end of the Pleistocene epoch about 12,000 years ago. It is, however, one of the first fine-grained, yet global, look at how and when species died.
"The evidence really strongly suggests that people were the defining factor," said study leader Chris Sandom, co-founder of the consulting firm Wild Business Ltd., who completed the work as a postdoctoral researcher at Aarhus University in Denmark…
(read more: Live Science)
image: Jonathan S. Blair/National Geo

Humans Blamed for Extinction of Mammoths, Mastodons & Giant Sloths, in New Study

by Stephanie Pappas

The latest volley in a long-running debate over why woolly mammoths, giant sloths, mastodons and cave lions died out worldwide suggests that humans are to blame.

A new global look at the extinctions of large mammals over the past 130,000 years finds that the loss of species correlates more closely with the arrival of humans than with changes in climate, which some studies have cited as a possible culprit.

Nonetheless, the paper is unlikely to settle the debate over what really caused the Quaternary extinction, a die-off of large mammals worldwide at the end of the Pleistocene epoch about 12,000 years ago. It is, however, one of the first fine-grained, yet global, look at how and when species died.

"The evidence really strongly suggests that people were the defining factor," said study leader Chris Sandom, co-founder of the consulting firm Wild Business Ltd., who completed the work as a postdoctoral researcher at Aarhus University in Denmark…

(read more: Live Science)

image: Jonathan S. Blair/National Geo

Climate Change Could Be the End for the Tuatara
by Olivia Wannan
Male tuatara can expect lonely love lives as the climate warms - before they eventually become extinct.

Males are already starting to outnumber females on Cook Strait’s North Brother Island, Victoria University researchers have found. The issue stems from how the gender of these reptiles is determined in the eggs.
Clutches exposed to warmer temperatures produce male hatchlings. Because of this, rising temperatures from climate change could lead to disastrous results for the island population, researcher Nicky Nelson said…
(read more: Stuff.co.nz)

Climate Change Could Be the End for the Tuatara

by Olivia Wannan

Male tuatara can expect lonely love lives as the climate warms - before they eventually become extinct.

Males are already starting to outnumber females on Cook Strait’s North Brother Island, Victoria University researchers have found. The issue stems from how the gender of these reptiles is determined in the eggs.

Clutches exposed to warmer temperatures produce male hatchlings. Because of this, rising temperatures from climate change could lead to disastrous results for the island population, researcher Nicky Nelson said…

(read more: Stuff.co.nz)

New Research Finds That Humans Are Responsible for Extinction of Giant Birds on New Zealand
by Jeremy Hance
Moas were a diverse group of flightless birds that ruled over New Zealand up to the arrival of humans, the biggest of these mega-birds stood around 3.5 meters (12 feet) with outstretched neck. While the whole moa family—comprised of nine species—vanished shortly after the arrival of people on New Zealand in the 13th Century, scientists have long debated why the big birds went extinct. Some theories contend that the birds were already in decline due to environmental changes or volcanic activity before humans first stepped on New Zealand’s beaches. But a study released today in the Proceedings of the National Academy of Sciences (PNAS) finds no evidence of said decline, instead pointing the finger squarely at us.  To find the moa’s smoking gun, scientists analyzed two different sets of DNA from 281 specimens made up of four species: the South Island giant moa (Dinornis robustus), the biggest of the family; the heavy-footed moa (Pachyornis elephantopus); the eastern moa (Emeus crassus); and the coastal moa (Euryapteryx curtus). Instead of showing a slow, genetic decline, the DNA told a different story: moas were thriving even as humans arrived…
(read more: MongaBay)
illustration by MIchael B.H./Wikimedia Commons

New Research Finds That Humans Are Responsible for Extinction of Giant Birds on New Zealand

by Jeremy Hance

Moas were a diverse group of flightless birds that ruled over New Zealand up to the arrival of humans, the biggest of these mega-birds stood around 3.5 meters (12 feet) with outstretched neck. While the whole moa family—comprised of nine species—vanished shortly after the arrival of people on New Zealand in the 13th Century, scientists have long debated why the big birds went extinct. Some theories contend that the birds were already in decline due to environmental changes or volcanic activity before humans first stepped on New Zealand’s beaches. But a study released today in the Proceedings of the National Academy of Sciences (PNAS) finds no evidence of said decline, instead pointing the finger squarely at us.

To find the moa’s smoking gun, scientists analyzed two different sets of DNA from 281 specimens made up of four species: the South Island giant moa (Dinornis robustus), the biggest of the family; the heavy-footed moa (Pachyornis elephantopus); the eastern moa (Emeus crassus); and the coastal moa (Euryapteryx curtus). Instead of showing a slow, genetic decline, the DNA told a different story: moas were thriving even as humans arrived…

(read more: MongaBay)

illustration by MIchael B.H./Wikimedia Commons

From the lynx to the lion-tailed macaque, these animals have survived outrageous odds.

Take a look at the state of wildlife welfare, and you will see that the biggest threats to animals’ existence are us. Between poaching and the destruction of habitats by industry and climate change, humans are drastically reducing important habitats and the creatures that dwell in them. The species in this gallery have had dangerous brushes with extinction, but because of the tireless work of conservation groups and recovery programs, they are still among us. Here we celebrate their survival!

Seeking a Break in a 252 Million-Year-Old Mass Killing

A Geologist Investigates a Mass Extinction at the End of the Permian Period

by Carl Zimmer

Sam Bowring is officially a geologist at M.I.T. Unofficially, he’s a homicide detective trying to solve the ultimate cold case. Dr. Bowring wants to understand how an estimated 96 percent of all species on Earth became extinct at the end of the Permian Period 252 million years ago. It was the biggest of the five mass extinctions recorded in the fossil record. But because this killing happened so long ago, the culprit has evaded discovery for decades.

Dr. Bowring and his colleagues have now gotten an important break in the case. They’ve made the most precise measurement yet of how long it took for all those species to become extinct. Writing in the Proceedings of the National Academy of Sciences, they report that the extinction took less than about 60,000 years. That’s a geological blink of an eye — a fact that will help scientists evaluate different hypotheses for what triggered the mass extinction.

For now, however, the new result has Dr. Bowring puzzled. “I just think there’s probably something really fundamental that we don’t understand,” he said…

(read more: NY Times)

Images:

T - Skull of Dinogorgon in South Africa. Many such mammal-like species became extinct 252 million years ago. Photo by Jonathan Blair/National Geographic

B -  Fossils of extinct squidlike creatures called ammonites located in a rock layer very close to the boundary between the Permian and Triassic periods. Credit: Seth Burgess

Bringing the Millerbird Back to Laysan Island
A project to reintroduce these little brown birds helps protect them from extinction.
by Emma Bryce
In 2011 a rescue mission more than 30 years in the making began to unfold in the Pacific Islands. Scientists were embarking on an expedition to reintroduce the Millerbird to a northwest Hawaiian atoll called Laysan Island. The nondescript little brown bird was last seen there in 1923, after having its habitat destroyed by introduced rabbits and livestock.
The biologists planned to capture birds from a nearby rocky outcrop called Nihoa Island—the Millers’ last stronghold—and transport them nearly 650 miles by boat to Laysan’s shore. The stakes were high: There were only about 800 Millers left, and moving even a small number of them seemed risky. But it was worth it, they decided.
"We believed that if the birds survived the trip, they would flourish," says Sheldon Plentovich, a U.S. Fish and Wildlife Service restoration ecologist, who planned the translocation.
The expedition made the three-day voyage twice, carrying a total of 50 birds, which appeared “unflappable,” says Plentovich. “Even in the boat, they were eating the whole time.” In the end, they all survived, and Laysan now supports more than 125 individuals…
(read more: Smithsonian Magazine)
illustration by John Gerard Keulemans

Bringing the Millerbird Back to Laysan Island

A project to reintroduce these little brown birds helps protect them from extinction.

by Emma Bryce

In 2011 a rescue mission more than 30 years in the making began to unfold in the Pacific Islands. Scientists were embarking on an expedition to reintroduce the Millerbird to a northwest Hawaiian atoll called Laysan Island. The nondescript little brown bird was last seen there in 1923, after having its habitat destroyed by introduced rabbits and livestock.

The biologists planned to capture birds from a nearby rocky outcrop called Nihoa Island—the Millers’ last stronghold—and transport them nearly 650 miles by boat to Laysan’s shore. The stakes were high: There were only about 800 Millers left, and moving even a small number of them seemed risky. But it was worth it, they decided.

"We believed that if the birds survived the trip, they would flourish," says Sheldon Plentovich, a U.S. Fish and Wildlife Service restoration ecologist, who planned the translocation.

The expedition made the three-day voyage twice, carrying a total of 50 birds, which appeared “unflappable,” says Plentovich. “Even in the boat, they were eating the whole time.” In the end, they all survived, and Laysan now supports more than 125 individuals…

(read more: Smithsonian Magazine)

illustration by John Gerard Keulemans

End-Permian extinction happened in 60,000 years—much faster than earlier estimates, MIT study says The largest mass extinction in the history of animal life occurred some 252 million years ago, wiping out more than 96 percent of marine species and 70 percent of life on land—including the largest insects known to have inhabited the Earth. Multiple theories have aimed to explain the cause of what’s now known as the end-Permian extinction, including an asteroid impact, massive volcanic eruptions, or a cataclysmic cascade of environmental events. But pinpointing the cause of the extinction requires better measurements of how long the extinction period lasted.
Now researchers at MIT have determined that the end-Permian extinction occurred over 60,000 years, give or take 48,000 years—practically instantaneous, from a geologic perspective. The new timescale is based on more precise dating techniques, and indicates that the most severe extinction in history may have happened more than 10 times faster than scientists had previously thought…
(read more: PhysOrg) (Image: © John Sibbick / Natural History Museum)

End-Permian extinction happened in 60,000 years—much faster than earlier estimates, MIT study says

The largest mass extinction in the history of animal life occurred some 252 million years ago, wiping out more than 96 percent of marine species and 70 percent of life on land—including the largest insects known to have inhabited the Earth. Multiple theories have aimed to explain the cause of what’s now known as the end-Permian extinction, including an asteroid impact, massive volcanic eruptions, or a cataclysmic cascade of environmental events. But pinpointing the cause of the extinction requires better measurements of how long the extinction period lasted.

Now researchers at MIT have determined that the end-Permian extinction occurred over 60,000 years, give or take 48,000 years—practically instantaneous, from a geologic perspective. The new timescale is based on more precise dating techniques, and indicates that the most severe extinction in history may have happened more than 10 times faster than scientists had previously thought…

(read more: PhysOrg)

(Image: © John Sibbick / Natural History Museum)

Excerpt from The Sixth Extinction: An Unnatural History
Writer Elizabeth Kolbert travels the globe investigating evidence that a mass extinction is underway.
The Icelandic Institute of Natural History occupies a new building on a lonely hillside outside Reykjavik. The building has a tilted roof and tilted glass walls and looks a bit like the prow of a ship. It was designed as a research facility, with no public access, which means that a special appointment is needed to see any of the specimens in the institute’s collection. These specimens, as I learned on the day of my own appointment, include: a stuffed tiger, a stuffed kangaroo, and a cabinet full of stuffed birds of paradise.
The reason I’d arranged to visit the institute was to see its great auk. Iceland enjoys the dubious distinction of being the bird’s last known home, and the specimen I’d come to look at was killed somewhere in the country—no one is sure of the exact spot—in the summer of 1821…
(read more: Audubon Magazine)
image of Great Auks by John James Audubon

Excerpt from The Sixth Extinction: An Unnatural History

Writer Elizabeth Kolbert travels the globe investigating evidence that a mass extinction is underway.

The Icelandic Institute of Natural History occupies a new building on a lonely hillside outside Reykjavik. The building has a tilted roof and tilted glass walls and looks a bit like the prow of a ship. It was designed as a research facility, with no public access, which means that a special appointment is needed to see any of the specimens in the institute’s collection. These specimens, as I learned on the day of my own appointment, include: a stuffed tiger, a stuffed kangaroo, and a cabinet full of stuffed birds of paradise.

The reason I’d arranged to visit the institute was to see its great auk. Iceland enjoys the dubious distinction of being the bird’s last known home, and the specimen I’d come to look at was killed somewhere in the country—no one is sure of the exact spot—in the summer of 1821…

(read more: Audubon Magazine)

image of Great Auks by John James Audubon

Woolly Mammoths Wiped Out by Grass Invasion?
Tundra and steppe turning to less-nutritious grasses may have contributed to extinction of ancient Arctic beasts.
by Dan Vergano
Grasslands suddenly spreading across the Arctic about 10,000 years ago helped killed off the woolly mammoth and other prehistoric mammals, suggests a study of ancient Arctic vegetation.
Climate warming after the Ice Age, prehistoric hunters, and even a comet impact have been proposed as reasons for the extinction of the mammoth, woolly rhinoceros, and other oversized “megafauna” that once inhabited Siberia and North America’s far northern plains.
The new DNA analysis of Arctic vegetation over the past 50,000 years, published in Nature by a team led by Eske Willerslev of the University of Copenhagen, offers a new wrinkle on the climate-warming theory: The great beasts vanished because they weren’t getting enough of the right food…
(read more: click above image)

Woolly Mammoths Wiped Out by Grass Invasion?

Tundra and steppe turning to less-nutritious grasses may have contributed to extinction of ancient Arctic beasts.

by Dan Vergano

Grasslands suddenly spreading across the Arctic about 10,000 years ago helped killed off the woolly mammoth and other prehistoric mammals, suggests a study of ancient Arctic vegetation.

Climate warming after the Ice Age, prehistoric hunters, and even a comet impact have been proposed as reasons for the extinction of the mammoth, woolly rhinoceros, and other oversized “megafauna” that once inhabited Siberia and North America’s far northern plains.

The new DNA analysis of Arctic vegetation over the past 50,000 years, published in Nature by a team led by Eske Willerslev of the University of Copenhagen, offers a new wrinkle on the climate-warming theory: The great beasts vanished because they weren’t getting enough of the right food…

(read more: click above image)

Maybe Dingoes Don’t Deserve Their Bad Rap
Studies show that Australia’s “favorite scapegoat” most likely didn’t kill the Tasmanian tiger
By Helen Thompson
ingoes are Australian icons for all the wrong reasons. Maligned as baby snatchers and sheep killers, the outback’s free-ranging dogs are viewed by many as pests. Until recently, they have also taken the blame for the extinction of two of the Australian mainland’s former inhabitants: the Tasmanian tiger and its relative, the Tasmanian devil.
Bert Roberts, a field ecologist at the University of Wollongong in Australia, argues for “a pardon for the dingo” in last week’s issue of Scienceand points to recent evidence placing the blame for those extinctions squarely on humans, instead.
For thousands of years, the Tasmanian tiger (Thylacinus cynocephalus), a wolf-like marsupial with tiger-esque stripes, dominated mainland Australia’s food chain, along with the Tasmanian devil (Sarcophilus harrisii). Hitching a ride with humans from Asia, the wild dogs showed up about 4600 years ago, and tigers and devils disappeared from the Australian mainland roughly 2000 years ago…
(read more: Smithsonian Magazine)
photo: Jarrod Amoore

Maybe Dingoes Don’t Deserve Their Bad Rap

Studies show that Australia’s “favorite scapegoat” most likely didn’t kill the Tasmanian tiger

By Helen Thompson

ingoes are Australian icons for all the wrong reasons. Maligned as baby snatchers and sheep killers, the outback’s free-ranging dogs are viewed by many as pests. Until recently, they have also taken the blame for the extinction of two of the Australian mainland’s former inhabitants: the Tasmanian tiger and its relative, the Tasmanian devil.

Bert Roberts, a field ecologist at the University of Wollongong in Australia, argues for “a pardon for the dingo” in last week’s issue of Scienceand points to recent evidence placing the blame for those extinctions squarely on humans, instead.

For thousands of years, the Tasmanian tiger (Thylacinus cynocephalus), a wolf-like marsupial with tiger-esque stripes, dominated mainland Australia’s food chain, along with the Tasmanian devil (Sarcophilus harrisii). Hitching a ride with humans from Asia, the wild dogs showed up about 4600 years ago, and tigers and devils disappeared from the Australian mainland roughly 2000 years ago…

(read more: Smithsonian Magazine)

photo: Jarrod Amoore

Reversing local extinction: scientists bring the northern bald ibis back to Europe after 300 years
by Federica Di Leonardo
The northern bald ibis (Geronticus eremita), also called the hermit ibis or waldrapp, is a migratory bird. Once, the bald ibis lived in the Middle East, northern Africa and southern and central Europe, but due to hunting, loss of habitat and pesticide-use, the birds disappeared from most of these areas and is currently considered Critically Endangered.

It became extinct in Europe 300 years ago; the bird is almost gone in Syria, with only a single individual recorded at the country’s lone breeding site in 2013; and the only stronghold left is a small population of around 500 birds in Morocco. But now, a team of scientists from Austria is working to reestablish a self-sustaining, migratory population of bald ibis in Europe.  In 2002 Johannes Fritz, who had been a doctoral student in biology at the Konrad Lorenz Research Station in Austria, came up with the idea of taking northern bald ibises from zoos and imprinting them, in effect becoming their foster parent to teach them a new migratory route to Italy…
(read more: MongaBay)
photograph by Waldrappteam

Reversing local extinction: scientists bring the northern bald ibis back to Europe after 300 years

by Federica Di Leonardo

The northern bald ibis (Geronticus eremita), also called the hermit ibis or waldrapp, is a migratory bird. Once, the bald ibis lived in the Middle East, northern Africa and southern and central Europe, but due to hunting, loss of habitat and pesticide-use, the birds disappeared from most of these areas and is currently considered Critically Endangered.
It became extinct in Europe 300 years ago; the bird is almost gone in Syria, with only a single individual recorded at the country’s lone breeding site in 2013; and the only stronghold left is a small population of around 500 birds in Morocco. But now, a team of scientists from Austria is working to reestablish a self-sustaining, migratory population of bald ibis in Europe.

In 2002 Johannes Fritz, who had been a doctoral student in biology at the Konrad Lorenz Research Station in Austria, came up with the idea of taking northern bald ibises from zoos and imprinting them, in effect becoming their foster parent to teach them a new migratory route to Italy…

(read more: MongaBay)

photograph by Waldrappteam

Testing De-extinction:

Research groups around the world are attempting to resurrect extinct species.

by Abby Olena

The only ever successful de-extinction was the birth of a baby bucardo (Capra pyrenaica pyrenaica)—a type of ibex specifically adapted to the Pyrenees Mountains in Europe—in 2003, though the young animal died soon after birth because its lungs did not function properly, according to BBC News. The clone was generated using frozen cells harvested in 1999 from the last bucardo, an old female that died in 2000. Now, the BBC reports that the Centre for Research and Food Technology of Aragon (CITA) in Zaragoza, Spain, will begin a new project to examine the burcado frozen cells to determine whether de-extinction efforts ought to be resurrected.

“At this moment, we are not initiating a bucardo recovery plan,” Alberto Fernandez-Arias, the head of the Service of Hunting, Fishing and Wetlands in the Aragon government, told the BBC. “We only want to know if Celia’s cells are still alive after having been maintained frozen during 14 years in liquid nitrogen.” Fernandez-Arias told the story of the 2003 bucardo de-extinction experiment in one of 25 talks at the TEDxDeExtinction meeting held this spring (March 15) in Washington, D.C…

(read more: The Scientist)