Canada: Why giant human-sized beavers died out 10,000 years ago - - PressFrom - Canada
  •   
  •   
  •   

CanadaWhy giant human-sized beavers died out 10,000 years ago

19:56  30 may  2019
19:56  30 may  2019 Source:   msn.com

Scheer vows criminal crackdown on human trafficking in election pledge

Scheer vows criminal crackdown on human trafficking in election pledge Conservative Leader Andrew Scheer is promising funding for police, survivor services and public awareness to fight human trafficking. The previous Conservative government created a four-year plan to combat human trafficking in 2012, which expired in 2016 shortly after the Liberals took office. Scheer says the lack of a strategy has sent a message that fighting human trafficking is no longer a federal priority. Scheer is promising to revive the Harper-era plan. He also vows to make changes to the Criminal Code to make it easier to convict people accused of human trafficking .

The following essay is reprinted with permission from The Conversation, an online publication covering the latest research. Giant beavers the size of black bears once roamed the lakes and wetlands of North America.

Giant beavers the size of black bears once roamed the lakes and wetlands of North America. Fortunately for cottage-goers, these mega-rodents died The species suddenly became extinct 10 , 000 years ago . The disappearance of the giant beaver coincides with that of many other large-bodied ice

Why giant human-sized beavers died out 10,000 years ago © Getty A full frame view of a beaver through an aquarium tank, part submerged with just nose eyes and ears above water looking directly and left front leg out stretched ,paw up waving hello

This article was originally published on The Conversation, an independent and nonprofit source of news, analysis and commentary from academic experts. Disclosure information is available on the original site.

Author: Tessa Plint, PhD researcher, Heriot-Watt University, and former graduate student, Western University

Giant beavers the size of black bears once roamed the lakes and wetlands of North America. Fortunately for cottage-goers, these mega-rodents died out at the end of the last ice age.

Marineland says Apollo the walrus has died of a heart attack

Marineland says Apollo the walrus has died of a heart attack The Niagara Falls amusement park and zoo says an independent necropsy shows the marine mammal died of heart attack in late April.

Giant beavers the size of black bears once roamed the lakes and wetlands of North America. Fortunately for cottage-goers, these mega-rodents died out at the end of the last ice age. Now extinct, the giant beaver was once a highly successful species.

Giant beavers the size of black bears once roamed the lakes and wetlands of North America. Fortunately for cottage-goers, these mega-rodents died The species suddenly became extinct 10 , 000 years ago . The disappearance of the giant beaver coincides with that of many other large-bodied ice

Now extinct, the giant beaver was once a highly successful species. Scientists have found its fossil remains at sites from Florida to Alaska and the Yukon.

A super-sized version of the modern beaver in appearance, the giant beaver tipped the scales at 100 kilograms. But it had two crucial differences.

The giant beaver lacked the iconic paddle-shaped tail we see on today's modern beavers. Instead it had a long skinny tail like a muskrat.

The teeth also looked different. Modern beaver incisors (front teeth) are sharp and chisel-like; giant beaver incisors were bulkier and curved, and lacked a sharp cutting edge.

The species suddenly became extinct 10,000 years ago. The disappearance of the giant beaver coincides with that of many other large-bodied ice age animals, including the iconic woolly mammoth. But until now scientists didn't know for certain why the giant rodent had died out.

Winnipeg man stunned after beaver shot and killed outside his home

Winnipeg man stunned after beaver shot and killed outside his home A Winnipeg man is calling for change after a beaver was shot and killed by a city contractor right outside his living room window Monday night. James Malzahn was in his backyard at his St. James home Monday evening when he heard a loud noise coming from Truro creek nearby. "I heard a loud bang and first I thought maybe it was a car that backfired, then I was thinking possibly a firecracker or something," Malzahn said.

This article was originally published on The Conversation, an independent and nonprofit source of news, analysis and commentary from academic experts. Disclosure information is available on the original site. —

Giant beavers the size of black bears once roamed the lakes and wetlands of North America. Fortunately for cottage-goers, these mega-rodents died The species suddenly became extinct 10 , 000 years ago . The disappearance of the giant beaver coincides with that of many other large-bodied ice

You are what you eat

We need to understand how the giant beaver lived in order to explain how and why it died out. For example, did it run out of food? Did it get too cold or too hot for it to survive?

Other studies found the giant beaver thrived when the climate was warmer and wetter. They also noticed that giant beaver fossils were most commonly found in sediments that come from ancient wetlands. But no one knew if the giant beaver behaved like the modern beaver. Did it also cut down trees? Or did it eat something completely different?

From an chemical perspective, you are what you eat! The food an animal consumes contains chemical signatures called stable isotopes that are incorporated into body tissues such as bone.

These isotopic signatures remain stable over time, for tens of thousands of years, and provide a window into the past. No other studies have used stable isotopes to figure out the giant beaver's diet.

Homeless found living with human feces, piles of garbage inside vacant building

Homeless found living with human feces, piles of garbage inside vacant building Moncton firefighters discovered two people living in nearly one metre of garbage and hundreds of needles inside a vacant apartment building this week.

Giant beavers the size of black bears once roamed the lakes and wetlands of North America. Fortunately for cottage-goers, these mega-rodents died The species suddenly became extinct 10 , 000 years ago . The disappearance of the giant beaver coincides with that of many other large-bodied ice

These prehistoric beasts died out 10 , 000 years ago , along with the other Pleistocene mega-fauna of New Only humans outmatch beavers in their ability to 2 Giant Hutia. Over 100, 000 years ago , the Caribbean island of Anguilla was ruled by monsters: rats twice the size of men. © Getty A full frame

We studied fossil bones from giant beavers that lived in the Yukon and Ohio between 50,000 and 10,000 years ago. We looked at the stable isotope signatures of the ancient bone tissues.

The isotopic signatures linked to woody plants are different from those associated with aquatic plants. We discovered that the giant beaver was not cutting down and eating trees. Instead, it was eating aquatic plants.

This strongly suggests that the giant beaver was not an "ecosystem engineer" like the modern beaver. It was not cutting down trees for food or building giant lodges and dams across the ice age landscape.

Instead, this diet of aquatic plants made the giant beaver highly dependent on wetland habitat for both food and shelter from predators. It also made it vulnerable to climate change.

Warm and dry climate

Towards the end of the last ice age 10,000 years ago, the climate became increasingly warm and dry and wetland habitats began to dry up. Although the modern beavers and the giant beaver co-existed on the landscape for tens of thousands of years, only one species survived.

Toronto police arrest two men in separate human trafficking cases

Toronto police arrest two men in separate human trafficking cases Toronto police announced arrests of two men for human trafficking-related charges, Saturday morning. The unrelated cases saw 27 charges laid against both Simon Ho-On, 23, and Patrick Raphael Duchard, 29. Human trafficking involves the recruitment, transportation, harbouring and/or exercising control, direction or influence over the movements of a person in order to exploit that person, typically through sexual exploitation or forced labour. Ho-On, from Toronto, was charged with 17 human trafficking-related offences on May 29, in addition to nine other offences that he was charged with in February.

They suddenly became extinct 10 , 000 years ago , while small modern beavers survived. Now scientists know why . A side-by-side comparison of a modern beaver , a human male (in this case, Justin Bieber) and a giant bear- sized beaver from 10 , 000 years ago .

About 10 , 000 years ago , giant beavers that roamed across North America went extinct. In a new study, a team of researchers found that the mega-rodents died out because of climate change.

The ability to build dams and lodges may have given the modern beaver a competitive advantage over the giant beaver. With its sharp teeth, the modern beaver could alter the landscape to create suitable wetland habitat where it needed it. The giant beaver couldn't.

This all fits into the puzzle that many research groups have been working on for decades: we all want to know what caused the global megafauna extinction event that occurred at the end of the last ice age and why so many species of large-bodied animals — woolly mammoths, mastodons and giant ground sloths — disappeared at roughly the same time.

Current evidence indicates that a combination of climate change and human impact were the driving causes behind these extinctions.

Studying the ecological vulnerabilities of long-extinct animals certainly poses its own unique challenges, but it is important to understand the impact of climate change on all species, past or present.

___

This article is republished from The Conversation under a Creative Commons license. Disclosure information is available on the original site. Read the original article:

https://theconversation.com/why-giant-human-sized-beavers-died-out-10-000-years-ago-117234

Tessa Plint, PhD researcher, Heriot-Watt University, and former graduate student, Western University , The Canadian Press

Read more

Brampton man gets four years for human trafficking.
A Brampton man has been sentenced to four years in prison after he was found guilty of numerous offences related to an ongoing human trafficking investigation, Peel police said. Jason Scott, 36, was sentenced Friday after he was found guilty by a Brampton court of human trafficking, receiving material benefit from human trafficking and assault earlier this year. In early 2014, Scott met a 22-year-old woman through social media and convinced her to travel to Toronto from Northern Ontario, police said. Shortly after arriving, Scott began posting ads for sexual services on the internet and arranged for clients to attend various hotels in the GTA.

—   Share news in the SOC. Networks

Topical videos:

usr: 6
This is interesting!