Tag: migratory bird

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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Anglers Competing With Cormorants

  • The cormorant population is booming in the region, and some anglers say they're competing too hard with the birds for fish. (Photo courtesy of Steve Mortensen, Leech Lake Band of Ojibwe)

Anglers around the Great Lakes are eager for a summer of fishing. Everyone wants to catch the big one. But they’re getting some competition. It comes in the form of the double-crested cormorant. The big black birds with long necks are fish eaters. Cormorants were nearly wiped out by the now-banned pesticide, DDT, in the 1970’s. But now cormorants are back in big numbers. Some anglers feel there are too many cormorants now. And they say the birds are eating too many fish. The Great Lakes Radio Consortium’s Stephanie Hemphill reports on one experimental effort to control cormorants:

Transcript

Anglers around the Great Lakes are eager for a summer of fishing. Everyone wants to
catch the big one, but they’re getting some competition. It comes in the form of the
double-crested cormorant. The big black birds with long necks are fish eaters.
Cormorants were nearly wiped out by the now-banned pesticide, DDT, in the 1970’s. But
now cormorants are back in big numbers. Some anglers feel there are too many
cormorants now, and they say the birds are eating too many fish. The Great Lakes Radio
Consortium’s Stephanie Hemphill reports on one experimental effort to control
cormorants:


(sound of waves)


Robin Whaley often fishes here on Knife River. It’s the biggest spawning ground for
rainbow trout on the north shore of Lake Superior. But today she’s watching the
cormorants on Knife Island, a quarter-mile offshore.


The cormorant population is booming. About a hundred cormorants lived on the island
last year.


“I guess they’re just coming up into this area in the last few years and becoming a
problem, for degrading habitat and for eating little fish.”


Cormorants are native to this area, but they haven’t been around much in the last few
decades, because of poisoning from the pesticide DDT.


The Minnesota Department of Natural Resources stocks rainbow trout here. This year
they put 40,000 young fish into the river. Anglers like Robin Whaley hope the little fish
will grow big enough for them to catch someday.


The little fish face a lot of predators and hazards and the cormorants are one more threat.
Some people would like to reduce that threat. It’s illegal to kill cormorants. They’re
protected by law because they’re a migratory bird.


But a new federal rule says if they’re threatening a resource, people can fight back in a
different way.


Bill Paul runs the Agriculture Department’s Wildlife Services Program in Minnesota. He
sent workers onto Knife Island to try to keep the cormorants from nesting. Their methods
are experimental – but they’re pretty basic.


“We put up some flapping tarps in wind, a couple of yellow raincoat scarecrows, we also
put up ten flashing highway barricade lights, we also have a light siren device out there
that goes during the night.”


The workers also used special firecrackers shot by guns at passing birds to scare them
away.


They did this for two weeks during the cormorants’ nesting season. Bill Paul says even
with all that noise and commotion it wasn’t easy to scare them away.


“They seem to be fairly smart birds and real persistent at coming back to Knife Island.
So we’re uncertain yet whether our activities are actually going to keep them off there
long-term.”


As part of their study, researchers had permission to kill 25 cormorants to find out what
they’d been eating. They wanted to see how much of a threat the birds were to game fish
like the rainbow trout.


They found fish in the cormorants’ stomachs all right. But not the kind most people like
to catch and eat.


Don Schreiner supervises the Lake Superior fishery for the Minnesota DNR. He says
he’d need more than just a few samples to really know what the birds are eating.


“My guess is that cormorants are opportunists and if there’s a small silver fish out there
and he’s just hanging out and the cormorant has that available to eat, he’ll eat it. The
question becomes, is this a significant part of the population that they’re consuming, or
isn’t it?”


Despite the concerns of some anglers, researchers have been studying cormorants for
years, and so far they haven’t been able to prove the birds are harming wild fish
populations.


John Pastor is an ecologist at the University of Minnesota Duluth. He says the study at
Knife River won’t prove anything useful either.


He says it ignores the bigger picture. Pastor says you can’t just look at one predator and
come to any firm conclusions. There could be lots of reasons why there aren’t many
steelhead, or rainbow trout.


“Changes in land use. All the adult steelhead out there eating the young of the year
steelhead. Maybe it’s some pollutant in the lake. You never know. But it’s easy to fix on
the predator as the problem, because people see a cormorant dive down and come up with
a fish, and they say to themselves, I could have caught that fish.”


Pastor says even if the cormorants are eating lots of young rainbow trout, it doesn’t
necessarily mean the birds are hurting the overall trout population.


And even for an angler like Robin Whaley, the concern about the trout is mixed with a
feeling of respect for the cormorant.


“I admire the bird very much, but human beings, we’re in the business of controlling
habitats and populations, and this is just another case of that.”


For many anglers, the ultimate question in this competition between predators is simple.
It’s about who gets the trout – cormorants or humans.


For the Great Lakes Radio Consortium, I’m Stephanie Hemphill.

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A Look at the Western Whooping Crane Flock

  • The Eastern flock of whooping cranes train for migration by following an ultralight. Photo courtesy of Operation Migration, Inc.

Some of the three dozen whooping cranes that winter in Florida have begun their spring migration to the Great Lakes region. More cranes are expected to fly north within the next few weeks. Wildlife officials put together that experimental migrating flock for the Eastern U.S., in case something happens to the only other migrating flock of whoopers, which winters in Texas and spends summers in western Canada. Scientists say there are several potential threats to the western birds. The Great Lakes Radio Consortium’s Chuck Quirmbach reports from the Texas Gulf Coast:

Transcript

Some of the three dozen whooping cranes that winter in Florida have begun their spring
migration to the Great Lakes region. More cranes are expected to fly north within the next few
weeks. Wildlife officials put together that experimental migrating flock for the Eastern U.S. in
case something happens to the only other migrating flock of whoopers, which winters in Texas
and spends summers in western Canada. Scientists say there are several potential threats to the
western birds. The Great Lakes Radio Consortium’s Chuck Quirmbach reports from the Texas
Gulf Coast:

The sight of a five foot tall adult whooping crane is awe-inspiring to many people. A Minnesota
man named Gary, who lives in Texas during the winter, says he loves to see the brilliantly white
whoopers and their amazing wing span.

“They’re pretty – huge and beautiful, pretty bird. Something we don’t have in Minnesota.”

The birds winter here at the Aransas National Wildlife Refuge. It’s a fifteen mile long by seven
mile wide peninsula north of the city of Corpus Christi. Aransas was the wintertime home for the
whoopers when the population of the endangered cranes dwindled to just 15 birds in the 1940s.
Today there are 194 whooping cranes in the Western flock.

“There’s a family out there.”

Crane Researcher Colleen Satyshur crouches down in a remote area of the refuge. she points at
three cranes.

“They’re just on the other side of the waterway that runs on the far side of the levy there. Two
parents on the outside and one baby in the middle”

The birds come to within about 100 yards.

It seems like a perfect place for the cranes. But because there is such a small number of birds, the
flock is at risk.

U.S. Fish and Wildlife Service whooping crane Coordinator Tom Stehn says 194 whoopers in one
site is just not that many.

“That’s just not much genetics in the population and there’s big threats to the population whenever
there’s concentrated in such low numbers.”

And a small gene pool is just the beginning of problems for the western flock of whoopers.

A few miles south of the Aransas refuge an earth mover loads dirt and rock into dump trucks.
Development along the Gulf of Mexico is taking up land. The human population here is expected
to double within forty years. Tom Stehn says that’ll increase demand for freshwater. He says
Texas is looking at diverting river water that currently flows into the Aransas refuge, where it
sustains crabs, a major food source for the whooping cranes.

“The crabs need the fresh water coming down the rivers, so if we dam up those rivers, prevent those inflows, the cranes
are gonna suffer.”

The refuge managers also worry about maritime accidents.

(sound of boat)

Boats like this one that travel the Gulf Intracoastal Waterway on the border of the Aransas refuge
sometimes carry toxic chemicals that could wipe out the birds with one spill.

Stehn says the list of potential risks to cranes is extensive – it includes things such as flying into
power lines along the cranes 2,400 mile migration route. He says there are new concerns, such as
global warming and West Nile virus.

Barring any disasters from those threats, Stehn says he’s pretty confident that generations of
whooping cranes will continue to winter in Texas for another 50 to 100 years. But Stehn says
even the crane’s longevity is in some ways a weakness.

“It’s a long lived bird with slow reproductive potential, so it’s gonna struggle to adjust if change
happens too rapidly.”

Stehn says the wildlife agencies can’t protect the birds from everything. But researchers can learn
more about the whooping cranes’ habits and hopefully that will help figure out the best ways
to aid the birds.

(sound of whooping cranes)

Help may come by tracking the cranes. This winter, Colleen
Satyshur recorded some of the birds’ calls. Some scientists believe
every crane has its own unique voiceprint that can be measured
through soundwaves run through a computer. Satyshur says they
think they might be able to use the voiceprinting as a way to
see which cranes are doing what.

“Which pairs are bringing down chicks, how many years, might tell us something new we can use to help us conserve the birds.”

Many people see the whoopers comeback as an inspiring symbol of wildlife preservation.
Keeping an eye on the birds is not just about the safety of the whooping cranes. Even with the
eastern flock becoming established and flying between Florida and the Great Lakes. Losing the
western flock of whooping cranes for any reason would be a blow to the entire wildlife
preservation movement.

For the Great Lakes Radio Consortium, this is Chuck Quirmbach in Southeast Texas.

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