Cormorant-Killing Policy Ruffles Feathers

  • Cormorant populations have risen exponentially from their previously dismal numbers. (Photo courtesy of the NOAA)

Across the Great Lakes region, the recovery of the cormorant
is booming. But some anglers and resort owners think the cormorants are eating too many of the fish that people like to eat. In some areas, wildlife managers have resorted to killing cormorants on popular fishing lakes. In one case, critics say there’s not enough evidence to justify the killing. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:

Transcript

Across the Great Lakes region the recovery of the cormorant is booming. But some anglers and resort owners think the cormorants are eating too many of the fish that people like to eat. In some areas, wildlife managers have resorted to killing cormorants on popular fishing lakes. In one case, critics say there’s not enough evidence to justify the killing. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:


Larry Jacobson is the third generation in his family to run the Hiawatha Beach Resort on Leech Lake, about two hundred miles north of Minneapolis. Three years ago, on fishing opener weekend, all of his twenty-one cabins were full. This year, he had no guests. Jacobson says the word has spread that fishing is down on Leech Lake. He blames the cormorants. The birds nest on a small island in the south end of the lake. Eight years ago, there were fifty nests; last year, there were two thousand five hundred.


“The cormorants eat about a pound fish a day. The way the population was just exploding out there, you could see writing was on the wall, that this was really going to make dramatic impact.”


Jacobson says his guests are still catching big walleye, but the smaller, pan-sized walleye are getting hard to find.


There are several reasons why the walleye population might be down, but Jacobson and other business owners blame it on the cormorants, and they’ve asked the Department of Natural Resources to do something about the birds.


“Leech needs to be maintained as high quality fishery. There’s such an economic impact to the area from walleyes, that if you don’t maintain it that way, everyone’s going to be suffering.”


(Sound of boat motor)


Resource officials are responding to the resort owners’ concerns. The Leech Lake Band of Ojibwe owns the island. John Ringle is wildlife manager for the tribe.


“Okay we’re headed right at Little Pelican Island right now.”


Little Pelican Island is about three acres of sand and scruffy shrubs. Hundreds of cormorants cover the shore. Ringle says they fish out here in the open waters of Leech Lake.


“They’re omnivorous so they’re eating all sorts of different varieties of fish. Right now they’re probably eating large numbers of perch.”


Ringle is working with state and federal agencies to reduce the number of cormorants nesting here, eating fish, and crowding out other birds, such as the endangered common tern.


Normally, cormorants are a federally protected bird, just like eagles. That’s because they were almost wiped out by the insecticide DDT before it was banned in 1973. But a new rule allows resource officials to harass and even kill cormorants where they’re damaging other wildlife.


This summer, workers are sitting in hunting blinds on Little Pelican Island, shooting cormorants. They use air rifles to make as little noise as possible, so the other cormorants aren’t spooked away.


So far, they’ve killed more than two thousand birds. They plan to leave about five hundred nesting pairs alive. Ringle says nobody’s happy about shooting cormorants, but he says he thinks it’s necessary.


RINGLE: “My philosophy is that as mankind utilizes the resource, we have to manage them, we’re not in finite supply.”


HEMPHILL: “Do you think we know enough to manage them?”


RINGLE: “Not really. I think the public is demanding action prior to any conclusive study being conducted.”


And that’s a big problem for Francie Cuthbert. She’s a professor and cormorant researcher at the University of Minnesota. Cuthbert says the agencies that want to cut down the cormorant population skipped an important part of the management process: finding out what’s actually happening on Leech Lake.


“They’re really being driven by complaints from citizens and resort owners who are concerned about local economics, and who just don’t like the birds; they’re afraid of the numbers. If we responded to all natural resources conflicts this way, we’d be in a state of chaos.”


Cuthbert says even with the cormorants’ dramatic comeback since the days of DDT, there still aren’t as many as there were a hundred years ago. She says rather than kill cormorants, wildlife officials should try to boost the number of fish.


The state of Minnesota is working on that. It’s stocking Leech Lake with walleye for the first time this year. Conservation officials are studying some of the birds they killed to find out what they’re eating. And the state is also limiting what size of walleye anglers can catch so the fish can recover.


That makes resort owners like Larry Jacobson nervous, because he says a lot of anglers don’t like the limits. But at least he’s glad someone’s doing something.


“The fishery is a business, there’s no question about that. If you want to sustain our economy in this area, you’ve got to manage the lake.”


Workers will continue shooting cormorants occasionally through the summer. And the control effort could continue. Experts say it’ll take several years for the fish to recover enough to draw anglers back to the lake.


For the GLRC, I’m Stephanie Hemphill.

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Duck Decline Blamed on Fragmented Habitat

  • A mallard duck hen sitting on her eggs in a strip mall tree planter in Ann Arbor, Michigan. Ducks Unlimited researchers have found that recent declines in duck populations are partly due to a lack of corridors between grasslands where ducks nest and wetlands where they thrive. (Photo by Rebecca Williams)

Researchers with the hunters’ conservation group Ducks Unlimited are reporting they’ve found some of the reasons the duck reproduction rate is falling in the Great Lakes region. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

Researchers with the hunters’ conservation group Ducks Unlimited are reporting they’ve
found some of the reasons the duck reproduction rate is falling. The Great Lakes Radio
Consortium’s Lester Graham reports:


(sound of birds, a duck quacking and a truck door slamming)


YERKES: “Load in.”


Two years ago, we went out in the field with biologist Tina Yerkes and other Ducks
Unlimited researchers.


YERKES: “Every day these guys go out and they track the birds and that’s basically how
we figure out what they’re doing. ”


(sound of newly hatched ducklings peeping with hen hissing)


At the time, they were tracking mallard hens, watching them nest, and watching them as
they moved their ducklings from the nests in the grass to nearby wetlands and lakes.
After three years of study, they found some of the reasons duck reproduction rates are
down. We recently had a chance to sit down and talk with Tina Yerkes about the study.
She says, surprisingly, they found that egg production and nesting are good, despite nests
being destroyed by mowers and predators eating the eggs.


TY: “The problem is duckling survival. We have very poor duckling survival in this
area. And, that leads us to believe that we need to alter habitat programs to actually start
doing more wetlands work.”


LG: “So, what’s happening is the ducks are able to nest, they’re able to hatch out the
ducklings, but then when they move from the grasslands where the nesting is to the
wetlands where the ducks feed, they grow, they’re not surviving. What’s killing them?”


TY: “What we’re seeing is that hens, once they hatch their young, they move right after
the first day into the first wetland and it’s a dangerous journey. Basically, because our
habitat is so fragmented that they’re moving these ducklings through non-grassed areas,
across parking lots, roads. It’s dangerous. And, a lot of the ducklings either die from
exhaustion or predators kill them on the way. A lot of avian predators get them at that
point.”


LG: “So, we’re talking about hawks and not so much domestic animals like cats and
dogs.”


TY: “Ah, cats are a problem, yeah. It’s hard to document exactly what is getting them,
but feral cats and domestic cats are a problem. Hawks and jays, sometimes…”


LG: “Blue jays?”


TY: “Blue jays can be mean, yeah. But, it’s interesting to note that if you put those
corridors back between nesting sites and wetlands, it’ll be a much safer journey for
them.”


LG: “So, what are you proposing?”


TY: “I would look more away from urban areas where those infrastructures are already
intact. We would not certainly expect anybody to tear that type of stuff up. But, outside
the cities and urban areas there are lots of opportunities to look at areas where there is
grass existing or wetlands existing and then piece the habitat back together where we
can.”


LG: “There are places, for instance in Chicago, where they’re working to do exactly that.
Do you see that kind of effort in most of the states you studied?”


TY: “Yes, actually we do. Some states like – Chicago’s a very good example. A very
strong park system not only throughout the city, but out in the suburbs as well and we do
see that in a lot of different places. That’s a positive thing.”


LG: “Where are the worst places for duckling survival?”


TY: “The worst duckling survival was the site that you were at two years ago in Port
Clinton, Ohio. And, if you think about what that habitat looks like, what you have is a
few patches of grass and an area that’s heavily agriculturally based, but all the wetlands
have been ditched and drained so that when a bird has to move from an area where it
nested to get to a nice, safe wetland habitat, they have to make a substantial move across
a lot of open fields that don’t have a lot of cover on them. So, here you’re looking at
maybe piecing cover back between the wetland areas and still being able to maintain farm
operations at the same time.”


LG: “What can farmers do to help duck survival?”


TY: “Oh, let’s see. Leave some patches of grass along the fields, especially if they have
wetlands in their fields. Leave a nice margin around the wetland, a nice vegetative
margin around the wetland because the ducks will nest right in that edge as well. Then
they don’t have to move very far to take the ducklings to a nice food source and a nice
wetland.”


LG: “Now, this is not just about making sure that mallard ducks reproduce. What’s this
going to mean for the ecosystem as a whole?”


TY: “Every time we replace a wetland or replace grass on the landscape, we’re
improving the water quality because those types of habitats remove nutrients and
sedimentation from runoff. So, there’s all kinds of benefits. There are benefits to any
other species that depends on grasslands to nest in or wetlands to either nest in or even
for migratory birds. So there’s just a suite of benefits beyond ducks.”


Tina Yerkes is a biologist with Ducks Unlimited. She says the group will be working
with states to develop programs to encourage development of corridors between the
grasslands where the ducks nest and the wetlands where they thrive.


For the Great Lakes Radio Consortium, I’m Lester Graham.

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A Good Turn for Terns

  • Researcher Lee Harper bands a common tern. Photo by David Sommerstein.

The common tern is a bird best known for its graceful flight and dramatic dives. Over the past 50 years, its best nesting habitat in the Great Lakes has been taken over by more aggressive birds, like gulls, cormorants, and osprey. Today, common terns are a threatened species in New York and Minnesota, and monitored carefully in other states. A couple years ago, a biologist and some volunteers used gravel and navigational buoys on the St. Lawrence River to create artificial nesting habitats for the terns. The Great Lakes Radio Consortium’s David Sommerstein reports on the experiment’s progress:

Transcript

The Common Tern is a bird best known for its graceful flight and dramatic dives. Over the
past 50 years, its best nesting habitat in the Great Lakes has been taken over by more
aggressive birds, like gulls, cormorants, and osprey. Today, common terns are a
threatened species in New York and Minnesota, and monitored carefully in other states. A
couple years ago, a biologist and some volunteers used gravel and navigational buoys on
the St. Lawrence River to create artificial nesting habitats for the terns. The Great Lakes
Radio Consortium’s David Sommerstein reports on the experiment’s progress:


The St. Lawrence isn’t just a river – it’s a seaway – an aquatic interstate for ocean freighters rumbling into the Great Lakes. So it’s not strange.


I’m in a boat floating just upstream from one of the river’s highway signs, a seaway
navigation marker.


We’re not talking about a plastic buoy – it’s a fixed concrete column rising 8 feet above the
water. Its platform is big enough that you can walk around on it. On top, a tall steel tower holds a red light and signs that serve as channel markers for the seaway traffic. But for the conservationists I’m tagging along with, this is bird habitat. We sit in silence and listen to the call of the Common Tern.


(tern squawking in the clear)


Dozens of small white birds with pointy wings and black caps swoop above our heads.
They soar, suspended, then suddenly dive into the water. Their orange beaks snap at
minnows just below the surface, then they shoot back up into the air.


(more squawks)


This particular colony was formerly the largest and most productive Common Tern
colony on the entire lower Great Lakes.


Biologist Lee Harper is known as “the tern guy” in this part of the Great Lakes. He’s
tagged thousands of them and recorded them as far away as Brazil. He documented the
common tern’s dramatic decline over the past twenty years. Gull and osprey populations
exploded, displacing the more sensitive terns from their nesting sites. But today Harper
peers through binoculars and grins.


“The terns we’re seeing here today represent the first nests on this site in almost ten
years.”


Terns don’t need much to nest, just a dry, isolated spot near water. Harper noticed the
refugee terns were retreating to navigation markers like this one. They’d lay eggs on its
concrete platform. The problem was the eggs would roll around and the birds would abandon
them. So Harper enlisted volunteers to lug 5 tons of gravel out here. They spread it on the
platform so the terns would lay their eggs on top of the gravel and the eggs wouldn’t roll.
Suzie Wood was among them.


“The first time I saw it, it was a piece of concrete and I frankly thought that Lee was a
little bit cracked when I heard about it.”


That was two summers ago. Today’s the first day the volunteers have returned. They’re
going to count nests and eggs to see how the gravel is working.


(motor sound, then clanking and action sound as we tie up)


We inch the boat up to the marker and huddle under the canvas top in case the birds dive-
bomb our approach. Then we tie up to an iron ladder that leads up to the concrete
platform. One by one, we climb the ladder and peer over the platform’s rim.


“Wow, this is a beautiful nest right here.”


Lee Harper is right behind and he’s beaming.


“After ten years of no terns here, this is really a wonderful sound!”


Almost invisible amongst the gravel and weeds are clusters of brown spotted eggs. We
walk on tip toe, look before every step, careful not to crush a nest. Harper works quickly
to minimize the disturbance. He calls out the number of eggs he sees. A volunteer takes
notes on a clipboard.


(counting)


Harper was here two weeks ago and counted 18 nests. Today there are 40 common tern
nests. Volunteer David Duff is impressed.


“It was just such a simple thing to do. I mean, a hundred twenty dollars worth of gravel
and a two or three hours and half a dozen people helping with five gallon buckets of gravel
and I think we have a victory, at least a preliminary victory.”


The gravel nests are starting to catch on. The St. Lawrence Seaway Development
Corporation is spreading gravel on navigation markers all along the Seaway. Groups in
Michigan are planning similar restoration efforts, using dredging spoils from the St. Mary’s
River. They’re man-made solutions, but ones that just might restore the Common Tern
population to health in the Great Lakes.


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

Utility Workers Build Osprey Nests

A threatened species of raptor is getting extraordinarycooperation from Wisconsin power companies this year. The Great LakesRadio Consortium’s Mike Simonson reports on how powerline workers arebuilding nests for osprey: