Jellyfish Taking Over Oceans?

  • A jellyfish under the Ross Sea ice, on October 14, 2005 (Photo by Henry Kaiser, courtesy of the National Science Foundation)

Some scientists are warning
that as overfishing and climate
change affect the world’s oceans,
jellyfish will take over the
ecosystem. That could mean that
eventually, if you cast a net
into the ocean all you’d haul
in would be jelly blobs. But
as Ann Dornfeld reports, such
warnings may be premature:

Transcript

Some scientists are warning
that as overfishing and climate
change affect the world’s oceans,
jellyfish will take over the
ecosystem. That could mean that
eventually, if you cast a net
into the ocean all you’d haul
in would be jelly blobs. But
as Ann Dornfeld reports, such
warnings may be premature:

The theory goes like this. Overfishing is removing the main jellyfish predators from the oceans. And warming oceans could be more hospitable to jellies.

A new report published in the journal Trends in Ecology and Evolution says jellyfish are already taking over. Its authors point to recent big jellyfish blooms as evidence.

But not everyone’s convinced.

“I think there’s a set of people that are sensationalizing the jellyfish bloom issue.”

University of Washington researcher Claudia Mills has been studying jellies for 30 years.

“I do think that probably jellyfish blooms are on the increase. But the problem is, we have so little baseline data that it’s almost impossible to really, honestly know that.”

Mills says there’s hardly any historical data on jellyfish populations, and not even much recent data.

She says it could be that the future of the world’s oceans is gelatinous and tentacled… or the blooms could just be cyclical.

For The Environment Report, I’m Ann Dornfeld.

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Osprey Nest Near Fish Hatchery

  • The osprey is a bird that scoops fish out of rivers and lakes (Photo courtesy of the National Parks Service)

Ospreys are birds of prey that eat fish. Todd Melby tells us about a pair of osprey that tried to nest near a fish hatchery:

Transcript

Ospreys are birds of prey that eat fish. Todd Melby tells us
about a pair of osprey that tried to nest near a fish hatchery:

The osprey is a raptor that scoops fish out of rivers and lakes.

So when a pair of osprey decided to mate near a DNR fish hatchery south of
Minneapolis, biologists were delighted and worried.

Ospreys rarely nest so far south. So that was good news. What worried biologists was
whether the birds would eat the fish. Biologists decided these fish were too small.

Another worry was the ospreys’ choice of a nesting site. In this case, the birds picked an
electrical power pole.

Lisa Gelvin-Innvaer is with the Minnesota DNR.

“They like high areas. Places that have room for them to put their nest. Transmission
poles often provide that.”

Biologists decided that was a bad idea, so they’ve built a tall nesting platform near the
power pole.

“We’re hopeful with the new nesting platform, that they’ll come back and attempt to nest
again.”

For The Environment Report, I’m Todd Melby.

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Usda Kills Wildlife

  • USDA Wildlife Services Killed 90,000 Coyotes in 2007 (Photo courtesy of Michigan Department of Natural Resources)

More than a hundred environmental
organizations want the incoming head of
the US Department of Agriculture to stop
killing wildlife. The agency has an office
that kills wild animals to save livestock.
Jennifer Szweda Jordan has more:

Transcript

More than a hundred environmental
organizations want the incoming head of
the US Department of Agriculture to stop
killing wildlife. The agency has an office
that kills wild animals to save livestock.
Jennifer Szweda Jordan has more:

The Center for Biological Diversity, the Sierra Club, and dozens of other groups signed on to a letter to Tom Vilsack. Vilsack is President-elect Obama’s pick for Agriculture Secretary. The environmental coalition is upset about the department’s Wildlife Services Agency. That agency removes or kills animals that threaten crops, farm animals, or cause other nuisances. Wildlife Services agents reported in 2007 that they killed more than two million animals, including 90-thousand coyotes, sometimes through poisoning.

Tom Vilsack did not return a call seeking comment about the letter.

The environmental groups say the poisonings and killings disrupt the balance of nature, and can leave persistent chemicals behind.

For The Environment Report, I’m Jennifer Szweda Jordan.

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Species Avoids Being Prey

A new study in the journal Ecology finds that in the animal world,
there are worse things than being eaten alive. Rebecca Williams
reports:

Transcript

A new study in the journal Ecology finds that in the animal world,
there are worse things than being eaten alive. Rebecca Williams
reports:


Getting eaten by a predator might be bad, but it might be just the
beginning of the bad news for prey.


Scientists looked at the effects of an invasive species in the Great
Lakes called the spiny water flea. The water fleas eat tiny creatures
called daphnia. In the study, daphnia swam to deeper, colder water to
get away from the predator.


Scott Peacor is a fisheries scientist with Michigan State University
and the Great Lakes Environmental Research Lab:


“Prey of course do all sorts of things to avoid becoming a meal. In this case,
the daphnia swimming down to colder waters means they reproduce at much
slower rates. So that’s a major cost in this case.”


So instead of one daphnia getting eaten, the entire population is at
greater risk of dying off. And that’s bad because daphnia are a key
food source at the bottom of the Great Lakes food web.


For the Environment Report, I’m Rebecca Williams.

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Firewood Fuels Ash Borer Problem

  • A live adult emerald ash borer. (Photo by Jodie Ellis, Purdue University)

If you’re packing up the car for a camping trip, you can’t
leave without the marshmallows and duct tape and bug spray, but
in more and more places, you can’t take firewood with you. That’s because government officials are worried about a destructive beetle
that people are spreading by moving firewood. The GLRC’s
Rebecca Williams reports:

Transcript

If you’re packing up the car for a camping trip, you can’t leave without the
marshmallows and duct tape and bug spray, but in more and more places, you
can’t take firewood with you. That’s because government officials are
worried about a destructive beetle that people are spreading by moving
firewood. The GLRC’s Rebecca Williams reports:


(Sound of RV humming)


Butch Sloan can’t imagine camping without a fire:


“Sitting back and watching the wood burn and kinda dreaming about old times
or whatever, you know? That’s part of your camping. Yeah, you gotta have
your camp fire!”


Sloan’s been coming to this Michigan campground from his home in Ohio for 20
years now. For the past few years, it’s been illegal for anyone to move
hardwood firewood over the state line. There can be steep fines if you’re
caught.


That’s because of the emerald ash borer. It’s an invader from Asia that’s
killing millions of ash trees in the upper Midwest. Moving just one piece
of infested firewood can start a new outbreak. Beetles can emerge from the
wood and fly to healthy ash trees.


Butch Sloan says he brings wood from construction sites or buys firewood at
the campground instead:


“As far as trying to bring regular firewood across the state lines, the fines
are just too high. I don’t want to take a chance on it, you know? We bring
the two by fours and stuff like that, and that’s good fire, good cooking, you
know!”


But there are plenty of campers who ignore the laws and bring firewood with
them. That’s why states such as Michigan and Ohio are setting up
checkpoints along highways. They’re trying to catch people sneaking
firewood out of infested areas.


(Sound of traffic)


Here on a two lane country road in Northwest Ohio, every car and truck is
being stopped. State workers ask the drivers if they’ve got firewood.


“If we do find someone that has brought firewood with them, we ask them to
pull into a parking lot and at that point we begin to interview them to find
out where the firewood came from.”


Stephanie Jaqua is a crew leader with the Ohio Department of Agriculture.
She says a lot of the people they catch don’t understand the quarantine
laws. But she says others don’t think they’re part of the problem:


“We have had people in the past say there’s no ash in the back of my truck, you know,
there’s no way I’m transporting emerald ash borer, and then you get to the
bottom and there are four pieces of ash in the bottom.”


Jaqua says that’s why the laws are written the way they are. It’s illegal
to move any hardwood firewood out of quarantined areas, not just ash wood.
Jaqua says the best thing campers can do is buy firewood where they camp and
burn it all up at the site.


A lot of campers say the firewood rules are annoying, but the rules have
changed everything for some people.


Jim Albring owns Lumber Jacks Quality Firewood. His business is in
Michigan, just a mile and a half from Ohio. He says before the ash borer
arrived, most of his customers were in Ohio. Then, suddenly, he couldn’t
move firewood across the state line.


“It was profitable and we were increasing by 25-30% a year until the ash
borer hit. And now we’ve dropped uh, boy, I don’t even know. I don’t really
look at the figures too much any more because it’s disheartening.”


Albring says at first, he could only sell to people a few miles away in
Michigan, so his customer base totally dropped out. He says these days,
people from Ohio still drive up and try to buy firewood from him.


“If we know or we’re suspicious it’s going back to Ohio, we tell them how
heavy the fines are and then they usually back off right away and they don’t
try to get it.”


That’s the problem with trying to stop the destructive insect from spreading
across the country. Even government officials admit there’s no way to stop
every single person from moving firewood.


Patricia Lockwood directs ash borer policy for Michigan:


“I think it’s going to be extremely difficult and we’ve known that from day
one, to stop it. What we have always agreed on is we’re buying ourselves
time. What we’re looking for is time so that the science can catch up.”


And researchers are scrambling to find something that will stop the ash
borer, a natural predator or a perfect pesticide. But scientists say
states have to contain the infestations in the meantime.


That means there’s a lot of pressure on campers and hunters to change their
habits. Tossing some wood in the back of the truck on the way up north used
to be pretty harmless. Now it’s changing entire landscapes, as millions of
trees get wiped out by the beetle.


For the GLRC, I’m Rebecca Williams.

Related Links

High Hopes for Whooping Crane Eggs

  • A baby whooping crane walks toward the camera. (Photo courtesy of the USGS)

Wildlife experts hope an experimental flock of whooping
cranes will lay more eggs this spring. The first egg produced during the experiment was recently found damaged. The Great Lakes Radio Consortium’s Chuck Quirmbach reports:

Transcript

Wildlife experts hope an experimental flock of whooping cranes
will lay more eggs this spring. The first egg produced during the
experiment was recently found damaged. The Great Lakes
Radio Consortium’s Chuck Quirmbach reports:


Scientists working on the project to develop 25 nesting pairs of
migrating whooping cranes in the eastern U.S. hope this is the year the
young cranes start to produce offspring.


But Michael Putnam of the
International Crane Foundation says one obstacle to the hatching of
crane eggs may be inexperienced parents.


“Once they do produce a fertile egg, then the birds have to exhibit the
right behaviors to tend the nest, incubate… and we’ve found some of
our birds- The females might be very good incubators at the
beginning, but it may take the male a year or two to catch on that’s
supposed to take a turn sittin’ on the egg.”


Putnam says other difficulties may include predators eating the eggs.
if the birds are successful, it’ll be the first whooping crane egg to
hatch in this part of North America in more than a century.


For the GLRC, I’m Chuck Quirmbach.

Related Links

Migrating Monarchs Face Obstacles

  • Each year, monarch butterflies make a perilous migration from Mexico up to the Midwest. (Photo by Deb Walker)

Monarch butterflies are on their way north once again. The Great
Lakes Radio Consortium’s Chris Lehman has an update on the threats facing
the monarchs on their long journey from Mexico:

Transcript

Monarch butterflies are on their way north once again. The Great Lakes Radio Consortium’s Chris Lehman has an update on the threats facing the monarchs on their long journey from Mexico:


The annual migration from Mexico to the upper Midwest takes several months. The butterflies that ultimately arrive here are the second and third generation of those that spend the winter in Mexico.


Matt Douglas is a professor of zoology at Grand Rapids Community College in Michigan. He’s studied monarchs for more than 25 years and has visited their wintering grounds in Mexico several times. He says monarchs so far have been able to withstand threats from nearby logging operations there. But he says the butterflies are far from invincible.


“You never know what’s going to hit you or when. If you have multiple bad experiences with weather or with parasites and predators, you’re not going to have many monarchs.”


Douglas says if all goes well, people in the Midwest should begin to see monarch butterflies starting in late May.


For the GLRC, I’m Chris Lehman.

Related Links

Cities Take Aim at Roosting Crows

  • Crows are roosting in huge groups in cities all over the country. The USDA is trying to find ways to get them to go back to their natural habitat. (Photo by Paige Foster)

Flocks of crows are nothing new in most cities. In the fall and winter months, crows forage for food during the day and roost in city trees at night. The birds like cities because they’re safe and comfortable. The residents generally don’t like the crows, though. The Great Lakes Radio Consortium’s Skye Rohde
reports:

Transcript

Flocks of crows are nothing new in most cities. In the fall and winter months, crows forage for food during the day and roost in city trees at night. The birds like cities because they’re safe and comfortable. The residents generally don’t like the crows, though. The Great Lakes Radio Consortium’s Skye Rohde reports:


(sound of crows)


There are a lot of crows here. About 63,000 of them are in the city. The trees are thick with them. At dawn and dusk, so is the sky. Bird feces coats city sidewalks and parked cars. Amy Emedon lives in town. She’s used to the crows.


“They make a lot of noise at night, or in the morning they kind of wake you up. But other than that, they don’t really bother me that much. They’re kind of gross, because their poop’s all over the place and they’re so loud and there’s so many of them. Like sometimes you can’t even see, like, the sky. It reminds me of that movie ‘The Birds.'”


Crows have been wintering in Auburn, New York for more than 100 years. Written records from as early as 1911 describe a very large roost downtown. Auburn has the largest crow roost in the state. This winter, city officials hired the U.S. Department of Agriculture to haze the crows.


(sound of distress calls and pyrotechnics)


Hazing means the eight USDA scientists drive around town using recorded crow distress calls, pyrotechnics and laser pointers – anything that will upset the birds and drive them out. Sometimes this includes shooting the birds, but not in New York state. Richard Chipman is the New York state director of the USDA’s wildlife services project. He says the idea is to move the birds to a more “natural” habitat.


“The goal is not to just relocate these birds and cause somebody else problems. The goal is to try to relocate them to a low-impact area to improve the quality of life of folks here in the city.”


The only problem with this plan is that the crows really like being in cities. The birds are smart. They’re communal. They recognize that they’re safer downtown than out-of-town. Kevin Mcgowan is an ornithologist at Cornell University who has studied crows for 16 years. He’s heard of large crow roosts in cities across the nation, ranging from 100 birds to two million. Mcgowan says it’s usually warmer in cities. Crows like that. And they like the big trees and streetlights.


“I think the lights is a big deal. Crows are scared of things that go bump in the night because those things eat them. And that’s pretty much great horned owls, okay? Great horned owl is probably the single scariest thing to a crow, because they come in at night when crows can’t see and owls can. And owls eat a lot of crows.”


Mcgowan says crows started settling in U.S. cities in much larger numbers in the 1970s and 1980s, after a change to the Federal Migratory Bird Treaty Act.


“In – I believe it was 1972 – there was an amendment to the act that afforded crows protection for the first time. What that meant was now you couldn’t just shoot crows anytime you wanted to. You had to do it under the direction of a state hunting season, which had regulations.”


As a result, people changed their behavior. They didn’t shoot crows as much, so the crows became less scared of them and moved closer. In other words, crows have realized that cities are safer habitats than their “natural” environment. Mcgowan says he’s seen it before.


“You have a big predator that scares away the smaller predator that’s the one that really bothers you, then it behooves you to hang around the big predator. Happens all the time around people. There are lots of things that come in to be around people because they’re relatively safe there.”


Whether the USDA can break that pattern in cities like Auburn remains to be seen. Scientists have surveyed this city and harrassed the remaining crows. But they might have to return next winter to do the same thing again. And Auburn officials, like those in other crow-filled cities, might need to consider changing those things that attract crows in the first place, rather than just focusing on scaring the birds away.


For the Great Lakes Radio Consortium, this is Skye Rohde.

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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.

Related Links

Non-Toxic Alternatives for Waterfowl Hunters

The federal government is getting ready to approve new types of non-toxic ammunition for shooting ducks and geese… but the government isn’t even thinking about tackling a related issue. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

The federal government is getting ready to approve new types of non-toxic ammunition for
shooting ducks and geese… but the government isn’t even thinking about tackling a related issue.
The Great Lakes Radio Consortium’s Lester Graham reports:


The U.S. Fish and Wildlife Service is in the process of approving three new types of non-toxic
shot for waterfowl hunting. Shotgun shell pellets used to be made of lead. But years of lead
pellets dropping into the wetlands found foraging waterfowl eating the lead and dying. So, lead
shot was banned in 1991. Since then, manufacturers have been looking for new shot formulations
that work well for hunters, but are non-toxic.


Nicholas Throckmorton is with the Fish and Wildlife Service and he says new kinds of shot give
hunters some options.


“Hopefully, late spring, early summer the three companies will be allowed to sell their new shot
formulations.”


While lead shot is banned, the government isn’t doing anything about lead bullets. Rifles still
use lead slugs. Game that is shot, but gets away is usually eaten by predators or scavengers.
Some of the animals, such as the endangered condor, have died from lead poisoning.


For the Great Lakes Radio Consortium, this is Lester Graham.