Tag: biologists

Ten Threats: Saving Wetland Remnants

  • Winous Point Marsh Conservancy and Duck Hunting Club's Roy Kroll collects millet. (Photo by Julie Grant)

Among the Ten Threats to the Great Lakes is the loss of thousands of square miles of wetlands along the lakes. From Superior to Ontario and on up the St. Lawrence Seaway, we’ve lost some of the most important wildlife habitat along the edges of the lakes. For example, 200 years ago, much of the southern shore of Lake Erie was a huge swamp. Most of those wetlands have been drained and filled since European settlement. Julie Grant reports on efforts to maintain the little bit that remains:

Transcript

In our next report in the series, Ten Threats to the Great Lakes, we’re going to hear about changes to a large area that drains into the lakes. Our guide through the series is the Great Lakes Radio Consortium’s Lester Graham:


Among the Ten Threats to the Great Lakes is the loss of thousands of square miles of wetlands along the lakes. From Superior to Ontario and on up the St. Lawrence Seaway, we’ve lost some of the most important wildlife habitat along the edges of the lakes. For example, 200 years ago, much of the southern shore of Lake Erie was a huge swamp. Most of those wetlands have been drained and filled since European settlement. Julie Grant reports on efforts to maintain the little bit that remains:


Researchers from the Cleveland area park district have been driving hours to get here to this bit of swamp nearly every day since last spring. Biologist Rick Spence and his partner wade through two feet of boot-sucking mud. They’re looking for turtles. Blanding’s turtles, to be exact. With a distinctive bright yellow chin and throat, it’s designated as a ‘species of special concern’ in Ohio…


“The Blanding’s originally were found in this area in the southern portion of Lake Erie, along this basin area. And so there’s a lot of the Blanding’s in here. It doesn’t get any better than this. We have nothing like this really around the Cleveland area that I know of.”


This area is the 150 year-old Winous Point Marsh Conservancy and Duck Hunting Club. It’s the largest privately owned coastal wetland in Ohio. It’s a thin strip of marsh that runs eight and a half miles along the shore.


Roy Kroll has been Executive Director of the Duck Hunting Club for more than twenty years. He keeps busy balancing the needs of researchers, biology classes, and reporters.


Kroll takes me onto the marsh in a wooden boat. He uses an old-fashioned pole to push us through water that’s only a couple of inches deep. It’s slow and quiet. He stops and uses the pole to slap the water for a call and response with migratory birds. (slap) He can hear who’s hiding in the cattails, arrowhead, and other emergent wetland plants…


(Kroll slaps water twice, birds respond)


“Well, looks like the teal have left and the rail are here.”


Kroll says the 4,500 acre marsh harbors over 100,000 waterfowl, mostly ducks, during November’s peak migration. There aren’t many places like this left on the Lake Erie coastline. More than 90 percent of the region’s wetlands have been drained. Most of that was done in the mid-1800s.


The area was once known as the Great Black Swamp. It stretched from Lake Erie all the way to Indiana. Much of it was under a dense canopy of hardwood trees. Kroll says it was a great system to filter river waters entering the lake. But European settlers and land speculators cut down most of the trees, dug ditches and straightened stream channels to move water quickly off the land. They built roads and transformed the swamp into rich, productive farm fields.


“You have to put yourself in the time period. Rightfully so, that was considered progress. And now we have to look back and say, well, yeah, it was progress and now it looks like it’s not progress. And if we’re not going to eliminate all these wetlands, we’re going to have to take some proactive measures to do it.”


Even at Winous Point, some of the wetlands are in poor condition. Standing on a man-made dike we look one way and see all kinds of plants: cattails, duckweed, and lily pads. But look to the side that’s not protected by the dike, and there’s no vegetation. Hand-drawn maps from the 1800s show a diversity of plants here, but now it looks like an open bay…


“What we’re looking at now is an open water wetland. And again, with no plants, we don’t have the structure for fish, invertebrates, and even plankton and algae to colonize on plant stems. It’s nowhere near as productive.”


Kroll says it’s not nearly as productive as the protected area. He says high lake levels, invasive carp, and pollution running off the land and into the rivers that drain into the lake have all made it tough for marsh vegetation to survive. Without plants, Kroll says the wetland can’t clean water running off the land…into the lake. He says it’s unrealistic to expect a short band of remnant wetlands to do the job of a hundreds of square miles of swamp forest.


“The key is to start at the upstream far upstream head of the watershed and begin restoring wetlands from there down to here.”


There are some efforts to re-store small parts of the Great Black Swamp. But Kroll says it’s also important to protect the little bit of the original coastal wetlands that are still left.


For the GLRC, I’m Julie Grant.

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Wolf Hunting Shouldn’t Be Taboo

  • As wolf populations are increasing, an old question arises: whether or not to allow wolf hunting. (Photo courtesy of the USGS)

In 2003, federal protections for the gray wolf in many parts of the country were downgraded. But last January, a federal district court in Oregon struck down that decision. In this region, the court ruling meant that wildlife officials lost the legal authority to kill problem wolves. Great Lakes Radio Consortium commentator Bob Butz thinks these courtroom battles are delaying the inevitable… and that hunters should have a hand in managing wolves:

Transcript

In 2003, federal protections for the gray wolf in many parts
of the country were downgraded. But last January, a federal district
court in Oregon struck down that decision. In this region, the court
ruling meant that wildlife officials lost the legal authority to kill
problem wolves. Great Lakes Radio Consortium commentator Bob Butz thinks these courtroom battles are delaying the inevitable… and that hunters should have a hand in managing wolves:


Today over half the entire wolf population of the continental United States can be found right here in the Upper Midwest. Around 3,000 in Minnesota. Roughly 800 more split evenly between Michigan and Wisconsin.


Some biologists think that Michigan’s wolf population might actually double within the next decade.
So why are so many people acting as if wolves in these parts are still teetering on the brink of extinction? Why this push for stronger federal protection when is seems what we really should start thinking about is how we plan to keep wolf populations responsibly in check?


With every new courtroom delay, I’m beginning to understand that for some people no amount of wolves will ever be enough. But very soon some judge is also going to figure that out, and finally wolves will be taken completely off the federal list of endangered animals. Then it will be up to the states to manage them.


Yet right now no one is talking about how we’re going to do that. Or where the money to sustain a healthy management program will come from – all because of a dirty little word – hunting.


Wolves… hunting. Remember in public to duck and cover when you say that.


But for the sake of the wolf, somebody needs to start talking about managing them as a big game species. Up until the latest court ruling, some government trappers had a fulltime job killing an increasingly number of nuisance wolves.


Minnesota officials are killing an average of a hundred and fifty wolves every year. In Wisconsin and Michigan each they kill a couple dozen more. Why are these wolves dying for nothing? If biologists used hunters to control the population, each wolf taken out of the system could result in money,lots of it, necessary for managing the species.


While most state biologists sit on the sidelines apparently without a plan, some people are taking matters into their own hands… killing the wolves illegally. In the Upper Midwest, poaching has reached levels unheard of a decade ago.


The reasons for this are simple: As one biologist told me, when an animal becomes too prolific it becomes devalued. As wolves make more and more trouble for farmers, ranchers, and locals, people are starting to wonder where all this is headed.


If brought into the management loop, hunters could easily outshine courtroom environmentalists as the wolf’s biggest hero and financial benefactor. Think of the giant Canada goose, believed to be extinct in North America until their rediscovery in 1965.


And how about all those shrub-eating, bumper bending whitetail deer? Call it tough love, but if anything when hunters get behind an animal recent history proves that the species will flourish.


But first biologists need to come up with a plan that gives the public a stake in helping with the long-term survival of the wolf. Wolves might be endangered elsewhere in the U.S., but not here. It’s time for leadership, time for a vision. Time for game managers to actually get out there and manage. It’s time for biologists to stop playing wait-and-see and, in the spirit of the wolf—for the sake of the wolf—get out in front of this issue and start leading the pack.


Host tag: Bob Butz is a hunter and author of the book “Beast of Never, Cat
of God: The Search for the Eastern Puma.” He lives in northern Michigan.

Related Links

Birders’ Passion Helps Scientists

  • The costs of hiring biologists to do a bird count across the U.S. would be astronomical. (photo by Deo Koe)

Every year, tens of thousands of avid birdwatchers wander through frozen fields and marshy swamps. Their job is to record as many birds as they can find in a given area. For birders, it’s a day to enjoy the outdoors while doing what they love most. But as the Great Lakes Radio Consortium’s Karen Kelly reports, that passion serves another purpose – it helps scientists:

Transcript

Every year, tens of thousands of avid birdwatchers wander through
frozen fields and marshy swamps. Their job is to record as many birds
as they can find in a given area. For birders, it’s a day to enjoy the outdoors
while doing what they love most. But as the Great Lakes Radio Consortium’s
Karen Kelly reports, that passion serves another purpose – it helps scientists:


(sound of footsteps)


Georgina Doe: “There’s five robins right there and there’s three common mergansers,
males…”


Georgina Doe scans the shoreline with her binoculars. Within seconds,
she spots a tiny glimpse of a bird and names it.


She knows them by the way they dive in the air, and the way they thrust
their chests out.


Doe has been scanning the treetops of Carleton Place, Ontario for
more than 30 years. She says she loves the chase and the element of surprise.
And over the years, birding has also been her escape.


She remembers watching a robin build its nest when her grandson
was seriously ill.


“So I used to count the birds every morning before I went off to
the hospital. And then after that, you come back to reality. Somehow a
little bird can just make you feel better.”


Birds have been a part of all of our lives. We might not know their names.
But we can remember holding a baby chick. Or hearing a cardinal on a crisp cold day. But now, many bird species are dwindling. And scientists are
counting on birders like Georgina Doe to help them find out why.


Doe is one of many birders in North America who collects
information for scientists. Jeff Wells works with that information
at Cornell University’s Lab of Ornithology.


“There’s no way that we could ever pay the tens of thousands of
trained biologists that would be necessary to gather this kind of
information. It’s only possible when we can engage volunteers like
we do in citizen science projects.”


Cornell runs at least a dozen programs that rely on information
from average birders.


There’s the Christmas Bird Count. About 50 thousand people participate.
Another 50 thousand track species during the Great Backyard Bird
Count in February.


The volunteers reported that wood thrushes are disappearing in
many areas. And they’re tracking the effect of the West Nile Virus
on bird populations.


“If a little bird dies, usually it just disappears quickly
and no one ever sees it. So we don’t really know the impact.
And so looking at the differences in the numbers and distribution
might give us some sense of when the disease was rampant in the summer,
whether it killed off enough birds to make a noticeable
difference in our count.”


(sound of quiet footsteps)


Robert Cermak: “You can see it’s about 10 inches high. It’s all fluffed
up right now…”


Birder Robert Cermak tiptoes closer to a barred owl sitting in the
crook of a tree. We’re in Ottawa, Canada’s capital and a city of about a million
people. When it comes to bird counts, this is Cermak’s territory.


“It’s not often that you see a barred owl, any owl, during
the day. They’re usually more secretive. This one is not too
afraid to be out so it’s probably more accustomed to having people
around it, since this is the center of the city.”


Like Georgina Doe, Cermak has been birding for years. But even with
veterans, there’s always concern about their accuracy. Cermak
discovered this firsthand when he reported seeing a rare
harlequin duck last year.


“I sent it in and a few hours later, someone from Cornell –
very politely because it’s a delicate subject to question
someone’s sighting of a rare bird – but they very delicately
indicated that a harlequin duck is extremely unusual in Ontario and
could I please provide a few extra details.”


Cermak sent them a published account of the sighting. He also
gave them the number of a local expert.


Jeff Wells says researchers check their facts carefully. They look
for reports that don’t match others in the surrounding area. Sometimes
an investigation turns up a trained ornithologist… and sometimes not.
But overall, Wells says the information has formed the basis for
hundreds of published studies.


That’s something that makes birders like Robert Cermak and
Georgina Doe feel proud.


“It’s nice because you’re contributing. You’re doing a
lot of hours, it uses a lot of gas, you go around a lot of blocks
but we just think it’s important.”


(sound of Georgina Doe walking)


Georgina Doe says she doesn’t really think of herself as a
scientist. But she’s out there every day, with her ear to the wind. And that’s
what the scientists are counting on.


For the Great Lakes Radio Consortium, I’m Karen Kelly.

Related Links

More Warming Warnings for Wildlife

A new report on global warming forecasts more uncertainty
for North American wildlife. The Great Lakes Radio Consortium’s Chuck Quirmbach reports:

Transcript

A new report on global warming forecasts more uncertainty for North American wildlife. The
Great Lakes Radio Consortium’s Chuck Quirmbach reports:


The Wildlife Society is a group of biologists, habitat managers and educators. The society has
looked over hundreds of peer-reviewed studies from the last few years on global warming and
wildlife. The report says the one degree Fahrenheit increase in average global temperatures over
the past century is already having some effect on species like songbirds.


The Wildlife Society also says a predicted larger increase in global warming will generally push
wildlife and habitats northward. Douglas Inkley of the National Wildlife Federation says this
northward push means migration corridors will need to be expanded.


“Generally on a North-South axis, would be the best direction to put those in, so that the wildlife
are able to move as the climate changes.”


The report also urges more measures to reduce emissions of pollutants that contribute to global
warming. The Wildlife Society will take up formal policy recommendations at its meeting in
March.


For the Great Lakes Radio Consortium, I’m Chuck Quirmbach.

Related Links

Moose Population Gets a Checkup

  • Researchers collect as much information as they can to take advantage of the rare opportunity of being close to a tranquilized moose. (Photo by Stephanie Hemphill)

Many wildlife lovers consider moose to have a special mystique. Adult moose are bigger than horses, and they seem fearless. But biologists don’t know much about many moose populations. A team of researchers is just beginning to learn about one herd of 4,000 moose in the Northwoods. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:

Transcript

Many wildlife lovers consider moose to have a special mystique. Adult moose are bigger than
horses, and they seem fearless. But biologists don’t know much about many moose populations.
A team of researchers is just beginning to learn about one herd of 4,000 moose in the
northwoods. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:


Half a dozen big four-wheel-drive pickups are parked at a boat landing on MacDougal Lake. It’s
about 30 miles west of the Lake Superior shore, in the heart of the Superior National Forest in
Northeastern Minnesota. The forest is twice the size of Delaware.


It’s 25 degrees. At the edge of the frozen lake, men in conservation officer uniforms are standing
around a small fire. They’re waiting to hear from the helicopter. The crew on the helicopter is
shooting moose with a tranquilizer gun. They need to get up close to the animals to learn more
about them.


Scientists think more moose could be living in this area. Mike Shrage is a biologist with the
Fond du Lac band of Chippewa. He says they’d like to know why there aren’t more moose here.
There are several possible reasons.


“Wolves, bears, lack of habitat, hunting and other kinds of human-related mortality, automobile
accidents.”


Shrage is listening to a radio cradled in a canvas holster on his shoulder. He cocks his head to
catch every word.


“There’s three of them there.”


The helicopter crew has spotted some moose.


“Yeah, I think they’re bulls.”


“These are three bulls. It’s not uncommon this time of year, you’ll get small groups of them
hanging together for awhile. Little bachelor groups.”


Shrage says the helicopter crew will try to chase one of the moose into an open area, like a frozen
lake, where they can get an easy shot.


“And if it lays down right in the lake, then they can sit down on the ice next to it. It makes
everything a lot easier.”


“Yeah, he’s gonna hopefully drop in the spot where they can get right to him.”


“I think they must already have a dart in him and they’re just waiting for it to take effect.”


The helicopter drops off a crew member to stay with the moose, and comes back to the boat
landing to pick up a radio collar.


(sound of helicopter)


Counting moose is a challenge. A recent survey in this area showed a drop from 5,000 to 4,000
animals in one year. But researchers admit there could be a 25% margin of error in those figures.
That’s because it’s hard to find the moose in heavily wooded areas. The collaring project will
make counts more accurate.


Three biologists are gathered around the latest moose to be fitted with a collar. He’s a mature
bull. He’s lying on his side in the middle of a huge frozen swamp.


He’s blindfolded to make the process less stressful. He seems to snore, while the biologists poke
and prod.


(sound of moose)
“Sounds pretty peaceful, doesn’t it? Pretty nice looking animal.”


They take blood samples to check on hormones and blood chemistry, and to look for disease.
They also pull a tooth to send to a lab. They can get an exact age by measuring the rings on the
tooth.


Glenn Delgiudice takes notes on the animal’s fat reserves. That’s a good indication of its overall
health.


Delgiudice even uses an ultrasound machine to measure the fat in the moose’s rear end.


“Rump fat is one of the main fat depots of these animals, and also one of the first to go. They
mobilize their fat depots generally in a sequence. So we measure the depth of the fat with
ultrasound.”


Another key indicator of the animal’s health is the condition of its hair. This moose has most of
its hair. They aren’t all so lucky. Some of them have scratched a lot their hair off.


<"Rick yesterday saw a calf of one of our cows that was what'd you say Rick, only 25% hair. So that one's been rubbing and scratching for a long time. And, of course, when they're doing that rubbing and scratching and biting, they're not foraging, and it can drain them over time."


The collar has to fit just right. If it’s too loose, a moose can get a foot caught in it. If it’s too
tight, it can bind, especially in the fall mating season when the bulls’ necks get thicker.


“Yep, that looks good.”


(clicking)


Finally the moose is given an antidote to the tranquilizer, pain-killer, and sedative that have kept
him immobile for about half an hour.


“You know, you’ll see his ears twitch, and he’ll start to lift his head,” Delgiudice says. “The
moose are better at getting up than deer typically. They just get up, loosen up a little bit, and
then lope away.”


The moose struggles up, stands for a minute, and then saunters off toward the trees.


That’s moose number five for the day. The team is planning to track 60 moose for five years.


It’ll tell them what kills these moose and what’s keeping the population from growing.


For the Great Lakes Radio Consortium, I’m Stephanie Hemphill, in the Superior National Forest.

Related Links

BIOLOGISTS TRACK LYNX’S RETURN

  • Canada lynx are rare in the U.S. Their populations fluctuate following the population cycles of snowshoe hare, their main prey. Photo courtesy of the Gov't of NW Territories.

Some areas of the Great Lakes are again home to an elusive wild cat. Canada Lynx disappeared from the region about twenty years ago. Now, considered threatened, lynx are turning up in the Superior National Forest for the first time in decades. Biologists are trying to figure out why they’ve come back, and whether they’ll stay. The Great Lakes Radio Consortium’s Bob Kelleher reports:

Transcript

Some areas of the Great Lakes are again home to an elusive wild cat. Canada Lynx disappeared
from Minnesota about twenty years ago. Now, considered threatened lynx are turning up in the
Superior National Forest for the first time in decades. Biologists are trying to figure out why
they’ve come back, and whether they’ll stay. The Great Lakes Radio Consortium’s Bob Kelleher
reports:


Lynx have tufted ears, a stubby tail, and big snowshoe feet. They’re a northern forest cat,
about the size of a cocker spaniel. Lynx range across much of Canada and Alaska, but
historically they were found in the Great Lakes region as well. Lynx are loners and range a huge
territory. They seem to follow their favorite prey, snowshoe hare, and recently, Minnesota’s
Superior National Forest has been jumping with hares.


“It doesn’t matter where snowshoe hares are. If they’re there, that’s where cats are going to be.”


University of Minnesota Researcher, Chris Burdette, has one possible explanation for the return
of Canada Lynx.


“There’s a lot of snowshoe hares in this part of the area, and up to 90% of a lynx’s diet is
snowshoe hares.”


Hare populations boom and bust in about seven-year cycles. But in recent population booms, the
lynx were missing. By the mid-1990s, lynx were considered gone from Minnesota, until now.
Three years ago, the cats were spotted again in the region.


Burdette has just begun to count and track northeast Minnesota’s lynx. Two cats have been fitted
with radio collars. It’s not yet clear how many others are wandering the forest. And Burdette
says, lynx do wander.


“It’s very likely that the majority of these animals migrated from Canada. These animals innately
want to disperse long distances.”


Burdette was checking his traps recently, marching through dense balsam fir and the last
remnants of spring snow.


(walking through snow)


His lynx traps are chicken wire boxes, the size of a big dog house, with a bit of hare or beaver in
the back and a door on the front poised to slap shut. But on this day, there were no lynx to be
found.


“It seems like it’s been in there. We cover it up with some balsam, spruce, pine
boughs – whatever we have to sort of make it look more natural. So this one looks clear.”


Lynx were added to the list of threatened species three years ago. An environmental group sued
the U.S. Fish and Wildlife service, saying the agency’s recovery plans overlooked lynx
populations in the Western Great Lakes, Maine and the Southern Rockies.


Mike Leahy, Counsel for Defenders of Wildlife, says it’s clear there are lynx in the Great Lakes
Region.


“The Minnesota Department of Natural Resources had for a long time vehemently denied that
there could possibly be more than one or two lynx in the entire state, and, they found indeed,
there’s a resident population of lynx in Minnesota.”


Lynx aren’t entirely welcomed. Some residents worry that rules protecting the threatened species
might stop timber sales, or close roads and recreation trails. They remember the Pacific
Northwest, where logging was stopped for spotted owls. But that won’t happen for lynx,
according to Superior National Forest Biologist, Ed Lindquist.


“It’s certainly not a four-legged spotted owl. It really likes regenerating forest – dense
regenerating forest – that provides good snowshoe hare habitat.”


And regenerating forest is what you get after harvesting timber. New aspen growth attracts hares.
Lynx also need older growth nearby for shelter.


Chris Burdette’s study will help create a lynx recovery plan. But he says recovery – actually
getting the cat off federal protection – isn’t even on the horizon.


“No where near it. Very preliminary stages. We’re just in the data collection stage right now, so we
can put some kind of scientific thoughts into the process of managing this species.


There’s little known about the elusive cat or it’s prey. Understanding snowshoe hares will help
researchers understand the lynx.


“Are they going to be here in three years? Are they going to be here in five years, or whatever?
That’s a very open question.”


Burdette will trap lynx until bears begin raiding the bait in his box traps. Then he’ll radio track
collared lynx and monitor hare feeding areas for signs of lynx. The lynx study is funded for three
years, but it might take ten to begin understanding this rare cat.


For The Great Lakes Radio Consortium, I’m Bob Kelleher.

Moose Population Gets a Checkup

  • Researchers collect as much information as they can to take advantage of the rare opportunity of being close to a tranquilized moose. Photo by Stephanie Hemphill.

Many wildlife lovers consider moose to have a special mystique. Adult moose are bigger than horses, and they seem fearless. But biologists don’t know much about many moose populations. A team of researchers is just beginning to learn about one herd of 4,000 moose in the Northwoods. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:

Transcript

Many wildlife lovers consider moose to have a special mystique. Adult moose are bigger than
horses, and they seem fearless. But biologists don’t know much about many moose populations.
A team of researchers is just beginning to learn about one herd of 4,000 moose in the
northwoods. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:


Half a dozen big four-wheel-drive pickups are parked at a boat landing on MacDougal Lake. It’s
about 30 miles west of the Lake Superior shore, in the heart of the Superior National Forest in
Northeastern Minnesota. The forest is twice the size of Delaware.


It’s 25 degrees. At the edge of the frozen lake, men in conservation officer uniforms are standing
around a small fire. They’re waiting to hear from the helicopter. The crew on the helicopter is
shooting moose with a tranquilizer gun. They need to get up close to the animals to learn more
about them.


Scientists think more moose could be living in this area. Mike Shrage is a biologist with the
Fond du Lac band of Chippewa. He says they’d like to know why there aren’t more moose here.
There are several possible reasons.


“Wolves, bears, lack of habitat, hunting and other kinds of human-related mortality, automobile
accidents.”


Shrage is listening to a radio cradled in a canvas holster on his shoulder. He cocks his head to
catch every word.


“There’s three of them there.”


The helicopter crew has spotted some moose.


“Yeah, I think they’re bulls.”


“These are three bulls. It’s not uncommon this time of year, you’ll get small groups of them
hanging together for awhile. Little bachelor groups.”


Shrage says the helicopter crew will try to chase one of the moose into an open area, like a frozen
lake, where they can get an easy shot.


“And if it lays down right in the lake, then they can sit down on the ice next to it. It makes
everything a lot easier.”


“Yeah, he’s gonna hopefully drop in the spot where they can get right to him.”


“I think they must already have a dart in him and they’re just waiting for it to take effect.”


The helicopter drops off a crew member to stay with the moose, and comes back to the boat
landing to pick up a radio collar.


(sound of helicopter)


Counting moose is a challenge. A recent survey in this area showed a drop from 5,000 to 4,000
animals in one year. But researchers admit there could be a 25% margin of error in those figures.
That’s because it’s hard to find the moose in heavily wooded areas. The collaring project will
make counts more accurate.


Three biologists are gathered around the latest moose to be fitted with a collar. He’s a mature
bull. He’s lying on his side in the middle of a huge frozen swamp.


He’s blindfolded to make the process less stressful. He seems to snore, while the biologists poke
and prod.


(sound of moose)
“Sounds pretty peaceful, doesn’t it? Pretty nice looking animal.”


They take blood samples to check on hormones and blood chemistry, and to look for disease.
They also pull a tooth to send to a lab. They can get an exact age by measuring the rings on the
tooth.


Glenn Delgiudice takes notes on the animal’s fat reserves. That’s a good indication of its overall
health.


Delgiudice even uses an ultrasound machine to measure the fat in the moose’s rear end.


“Rump fat is one of the main fat depots of these animals, and also one of the first to go. They
mobilize their fat depots generally in a sequence. So we measure the depth of the fat with
ultrasound.”


Another key indicator of the animal’s health is the condition of its hair. This moose has most of
its hair. They aren’t all so lucky. Some of them have scratched a lot their hair off.


“Rick yesterday saw a calf of one of our cows that was, ‘what’d you say Rick, only 25% hair?’ So
that one’s been rubbing and scratching for a long time. And, of course, when they’re doing that
rubbing and scratching and biting, they’re not foraging, and it can drain them over time.”


The collar has to fit just right. If it’s too loose, a moose can get a foot caught in it. If it’s too
tight, it can bind, especially in the fall mating season when the bulls’ necks get thicker.


“Yep, that looks good.”


(clicking)


Finally the moose is given an antidote to the tranquilizer, pain-killer, and sedative that have kept
him immobile for about half an hour.


“You know, you’ll see his ears twitch, and he’ll start to lift his head,” Delgiudice says. “The
moose are better at getting up than deer typically. They just get up, loosen up a little bit, and
then lope away.”


The moose struggles up, stands for a minute, and then saunters off toward the trees.


That’s moose number five for the day. The team is planning to track 60 moose for five years.


It’ll tell them what kills these moose and what’s keeping the population from growing.


For the Great Lakes Radio Consortium, I’m Stephanie Hemphill, in the Superior National Forest.

Biologists Launch Society to Save Sturgeon

Biologists from seven countries are banding together to protect a large, ancient fish. Earlier this month, scientists launched what they call the “World Sturgeon Conservation Society.” The Great Lakes Radio Consortium’s Patty Murray has more:

Transcript

Biologists from seven countries are banding together to protect a large,
ancient fish. Earlier this month/last month (March) scientists launched what they
call the “World Sturgeon Conservation Society.” The Great Lakes Radio
Consortium’s Patty Murray has more:


Sturgeon are among the oldest fishes in the world. They’ve been around
since the pre-historic era.


But modern pressures are testing the fish. That’s why sturgeon biologists
recently formed the “World Sturgeon Conservation Society.”


Ron Bruch is a sturgeon biologist with the Wisconsin Department of Natural
Resources.


He says North American sturgeon stocks are fairly healthy. But Bruch says
that’s not the case in the Caspian and Black seas where the fish often wind
up on the illegal caviar market.


“The stocks there are on track to collapse in the next 15-20 years because
of poaching, problems with habitat and pollution. There’s a real need in
the sturgeon community for international help to pull that situation out
before it’s beyond repair.”


Bruch says members of the World Sturgeon Conservation Society will share
research that can help reduce illegal sturgeon harvest. One idea is to
raise sturgeon on aquaculture farms to offset the need for black market
caviar.


For the Great Lakes Radio Consortium, I’m Patty Murray.

Virgin Shark Birth Sets Researchers in Motion

  • Biologists are looking at how a shark in a Great Lakes region aquarium gave "virgin birth" last year. Photo courtesy of Belle Isle Aquarium, Detroit.

A female shark in an aquarium in the Great Lakes region has apparently given virgin birth. Four shark eggs hatched last year and three of those babies are now growing normally. As the Great Lakes Radio Consortium’s Celeste Headlee reports, it may be some time before the cause can be determined, but the event is still a surprise for biologists:

Transcript

A female shark in an aquarium in the Great Lakes region has apparently given virgin birth. Four
shark eggs hatched last year and three of those babies are now growing normally. As the Great
Lakes Radio Consortium’s Celeste Headlee reports, it may be some time before the cause can be
determined, but the event is still a surprise for biologists:

Biologists have a technical term for virgin birth. It’s called parthenogenesis. Doug Sweet is the
Curator of Fishes at the Belle Isle Aquarium in Detroit. He says parthenogenesis is common in
invertebrates and some amphibians.

“Most vertebrate animals, the females will produce eggs even if the male is not around. And it’s
just a matter of… it’s a chemical trick, basically, to get that egg to develop into an individual
without a sperm activating it.”

But parthenogenesis has been totally unheard of for sharks, until now. Last year, the Henry
Doorly Zoo in Omaha, Nebraska, announced they thought a Bonnethead shark there had
reproduced by parthenogenesis. The baby lived less than 12 hours, though, and genetic tests were
inconclusive.

But when Doug Sweet saw the press release from the Henry Doorly Zoo about a possible virgin
birth, he thought he’d try an experiment. Sweet decided to incubate the eggs of his two female
bamboo sharks. Four of the eggs developed. Sweet says the sharks were acquired by the
aquarium before they had reached sexual maturity, and they have never been exposed to a male.
He says the likely conclusion is that these sharks are reproducing by parthenogenesis.

Two other explanations, though highly unlikely, are that the shark has both testicular and ovarian
tissue, and fertilized its own eggs or that sharks are capable of storing sperm for years and even
passing it down to their offspring. Sweet has sent small clippings from the sharks’ fins to the
Henry Doorly Genetics Lab. Testing has already begun, but Sweet says it could take more than a
year to get the results. In the meantime, Sweet says the facts remain the same: a female shark
has given virgin birth. If it is parthenogenesis, he says, it will have important implications for
biologists around the world.

“Parthenogenesis just hasn’t been considered to happen in sharks; it’s never been recorded. It may
be happening all the time out there, so this is kind of breaking news in the shark world.”

The two adult bamboo sharks and the offspring are currently on exhibit at the Belle Isle
Aquarium in Detroit.

For the Great Lakes Radio Consortium, I’m Celeste Headlee.

Killing River to Stall Spread of Invasives?

Biologists are trying to prevent invasive species such as the Asian carp, from traveling between the Great Lakes and the Mississippi River basin. The latest plan proposed by some scientists is to remove all the oxygen from a section of the Chicago River. The Great Lakes Radio Consortium’s Annie MacDowell has more:

Transcript

Biologists are trying to prevent invasive species such as the Asian carp from traveling between
the Great Lakes and the Mississippi river basin. The latest plan proposed by some scientists is to
remove all the oxygen from a section of the Chicago river. The Great Lakes Radio Consortium’s
Annie Macdowell has more:


Scientists say killing part of the river would create a barrier no fish could swim through and live.
Removing the oxygen is against the Clean Water Act, but biologists think it might be worth it.


Jerry Rasmussen is a river biologist with the U.S. Fish and Wildlife Service. He says the
potential economic and ecological disaster from the invasive species justifies creating this dead
zone.


“The real problem has been reluctance of everyone, including myself, to take a measure like this
because of the implications of it and the precedents it sets, but the concern is significant enough
with these Asian Carp that a significant problem may require significant measures to stop it.”


Rasmussen says killing a section of the river buys engineers time to work on a long-term solution
to the invasives problem, such as building a second electric barrier. He says the river would be
shut down for a minimum of two years and then re-oxygenated so that living things could return.


For the Great Lakes Radio Consortium, I’m Annie MacDowell.