Tag: predator

Turtle Numbers Down; Trapping Banned

  • Joanna Schmidt, a student at Minnesota State University-Moorhead, is part of a long-term turtle research project. She's trying to find out why turtle populations are declining in the Midwest. For her research, she catches turtles and gives them an identifying mark, then weighs and measures them before putting them back in the water. (Photo by Dan Gunderson.)

Many Great Lakes states are taking steps to protect turtles. There’s a big demand for turtles in Asia and Europe. But too much trapping can damage wild turtle populations. As a result, states are placing bans or restrictions on turtle trapping. The Great Lakes Radio Consortium’s Dan Gunderson reports:

Transcript

Many Great Lakes states are taking steps to protect turtles. There’s a big demand for turtles in
Asia and Europe. But too much trapping can damage wild turtle populations. As a result, states
are placing bans or restrictions on turtle trapping. The Great Lakes Radio Consortium’s
Dan Gunderson reports:


(sound of paddling)


Joanna Schmidt pushes a canoe into a small slough in northern Minnesota. She paddles toward a
floating rectangle of plastic pipe. The simple device is a turtle trap. It’s about four feet long with
net in the bottom and a board attached to the side.


“We put a plank on the side and they crawl up to sun themselves and they
just fall in. It’s pretty simple. No mechanics to it. They do all the work for us.”


Joanna Schmidt is a student at Minnesota State University Moorhead. She’s
part of a long-term turtle research project. Researchers want to learn
more about turtle habitat, and why there’s been a recent decline in turtle
populations.


This slough is about a quarter mile across. It lies in a hollow surrounded
by farm fields. Chest high grass and reeds line the water’s edge. Along one end, dead,
sunbleached trees stick out of the water. It’s perfect turtle habitat.


“It’s warm, a lot of food for them, not very many predators, so they like it,
especially having the dead trees with a place to hang out and sun themselves. So this is
very typical.”


Gunderson: “Any estimate of how many turtles might live in a slough this size?”


“Not just yet. That’s what we’re hoping to get to. And that’s what the DNR would
like to know.”


There are several turtles in the trap. Most have been caught before.
They’re identified by small notches in their shells. Schmidt weighs and measures
each turtle before gently setting them back in the water.


Minnesota State University Moorhead Biology professor Donna Stockrahm is
directing this research project. She says it takes years of research to get meaningful data about
turtles. They grow very slowly and they live a long time.


Stockrahm is hoping to learn about rates of turtle mortality, growth rates,
and the optimum habitat for turtles.


She’s seen a puzzling decline in turtle numbers.


“We started this in 2001 and they marked over 250 turtles. Then in 2002
the number just dropped drastically. And there seemed to be fewer turtles
around, even turtles that you see out sunning themselves on rocks and limbs and
dead tree trunks and things like that.”


Stockrahm says she doesn’t have an explanation for the decline. She’s
waiting to see if the trend continues this year.


Turtles are in demand in Europe for pets, and in Asia for
traditional medicines. More than seven million turtles are
exported from the United States each year.


Minnesota Department of Natural Resources researcher Rich Baker says
trapping is one reason turtle populations are down.


“What we’ve learned relatively recently is that especially in northern
latitudes commercial harvest really isn’t sustainable. These populations
of slowly maturing species just can’t sustain harvest of adults from the
population.”


Rich Baker says demand for turtles is driven largely by Asian and European
markets. Baker says many Asian turtle species are endangered because of
overharvest.


Those markets are turning to North America which is a particularly turtle-rich
part of the world and the upper Midwest which is a particularly
turtle-rich part of North America. Many of the states in the upper Midwest
have actually closed commercial turtle harvest completely.”


Most Great Lakes states now ban or restrict turtle trapping. Rich Baker
says Minnesota decided to phase out commercial harvest. He says about a dozen
people make a living trapping turtles. They’ll be allowed to continue.


People who like to eat turtle can still get a license to trap for personal
use. But there will be no new commercial turtle trapping licenses.
Minnesota will allow turtle farms as an alternative to harvesting wild turtles.


For the Great Lakes Radio Consortium, I’m Dan Gunderson in Moorhead, Minnesota.

Small Forest Patches Breed Disease

Chopping down trees for subdivisions and farm fields isn’t just bad for forests. It can also hurt people. According to new research, small patches of woodlands breed more ticks with Lyme disease. The Great Lakes Radio Consortium’s David Sommerstein reports:

Transcript

Chopping down trees for subdivisions and farm fields isn’t just bad for
forests. It can also hurt people. According to new research, small
patches of woodlands breed more ticks with Lyme disease. The
Great Lakes Radio Consortium’s David Sommerstein reports:


Felicia Keesing, a biology professor at Bard College, wanted to know
where people ran the greatest risk of getting Lyme disease, an illness
spread by ticks. She knew Lyme disease-bearing ticks are carried mostly
by the white footed mouse. And she knew that kind of mouse thrives in
small chunks of forest.


That’s because its predators need larger woods to live and have
moved away. So Keesing compared forest chunks of different sizes for
tick populations. She found a lot more ticks with Lyme disease in small
forests boxed in by houses or farmland.


“On average about seven times as likely to encounter an infected tick in a patch of woods
smaller than five acres.”


Keesing says the results send a clear message to town and village zoning boards
weighing development issues. They should do everything they can to prevent the
fragmentation of forests.


Keesing says her research doesn’t suggest small lots should be cut down altogether. But
new development could be better planned to reduce the risk of Lyme disease.


For the Great Lakes Radio Consortium, I’m David Sommerstein.

Related Links

Cougars Still Stalking the Region?

For many years, state and federal wildlife officials have considered the cougar extinct in the Great Lakes region. However, many people claim to have seen the large predatory cat long after it supposedly disappeared. Conservationists debate whether these sightings are real and if they are, they wonder whether the cougars are wild or merely escaped pets. Investigations are underway in many states, including Minnesota, Wisconsin and Pennsylvania, and in Canada. Now, a wildlife biologist in Michigan says he has proof that a breeding population of wild cougars is living in the Upper Peninsula. The Great Lakes Radio Consortium’s Gretchen Millich reports:

Foreign Wasp Flying Westward

A foreign wasp from Europe has made its way to several Great Lakes states this summer. The European Paper Wasp was first detected on the Eastern seaboard in 1980. But as the Great Lakes Radio Consortium’s Gina Carrier reports, it’s now being sighted in greater numbers in the Midwest:

Transcript

A foreign wasp from Europe has made its way to several Great Lakes states this summer. The European Paper Wasp was first detected on the Eastern seaboard in 1980. Now it is being sited in greater numbers in the Midwest. The Great Lakes Radio Consortium’s Gina Carrier reports.


The European Paper Wasp looks very similar to our native yellow jacket. But it’s not as aggressive and can actually help Midwest gardeners because it likes to feed on certain pesky caterpillars. Tom Ellis is an entomologist at Michigan State University. He says the European paper wasp can be found in central and southeastern Michigan, Indiana, and Ohio and the Chicago area.


“The things that it became accustom to and fed on the eastern seaboard are pretty much similar if not the same to what we have in Michigan and throughout the Great Lakes states certainly.”


He says it’s unknown whether the wasp will continue to move westward. There’s no effort to stop its spread because Ellis says the wasp isn’t destroying crops or foliage. For the Great Lakes Radio Consortium, I’m Gina Carrier.

Cats’ Role in Public Health

Humans first domesticated cats in about 2000 B-C. Since then,
our view of felines has ranged from loving to loathing …depending on
the
time and culture. Now, a new book traces the history of cats …and
makes
some connections about their impact on human health. The Great Lakes
Radio Consortium’s Wendy Nelson reports:

Wolf Killed by Government Order

A timber wolf has been shot by a federal officer in Wisconsin. For the
past twenty-five years the wolf has been listed on the federal
endangered species list. But now the wolf’s status is being changed from
endangered to threatened making it easier to use lethal force on problem
wolves. The Great Lakes Radio Consortium’s Nick Van Der Puy has more: