Whooping Cranes Not Hatching

  • One of the goals of the Partnership is to get more cranes to raise young in the wild, but so far, only one crane chick has been successfully hatched and gone on to migrating. (Photo courtesy of the US Fish and Wildlife Service)

Wildlife experts are trying to bring back a flock of migrating whooping
cranes in the eastern United States. But there’s a problem. Scientists are
having trouble getting the whoopers to hatch chicks in the wild. Chuck
Quirmbach reports – researchers are taking a closer look at the ten-year-old
rehabilitation effort:

Transcript

Wildlife experts are trying to bring back a flock of migrating whooping
cranes in the eastern United States. But there’s a problem. Scientists are
having trouble getting the whoopers to hatch chicks in the wild. Chuck
Quirmbach reports – researchers are taking a closer look at the ten-year-old
rehabilitation effort:

It’s not easy to get whooping cranes to reproduce, but here in Baraboo,
Wisconsin, researchers have had success at getting captive cranes to produce
chicks.

For the last ten years, the Whooping Crane Eastern Partnership has created a
flock of more than 100 whoopers. Researchers hatched the birds
– and trained them to migrate by flying behind ultralight aircraft ….or to
follow adult cranes. The birds now fly between the upper Midwest and
southeastern U.S.

But one of the goals of the Partnership is to get more cranes to raise young
in the wild. So far, only one crane chick has been successfully hatched and
gone on to migrating.

Jeb Barzen is with the International Crane Foundation. He says they can’t
keep supplying the flock with chicks hatched in captivity:

“It’s expensive. it’s expensive in time, expensive in money…expensive in overall conservation effort, because what you put into whooping crane reintroduction you can’t put into other conservation projects at that time. so to be fully successful …you want that population to be
able to survive on it’s own.”

So far, about 16 million dollars has gone into re-introducing whoopers to
the eastern u.s. More than half of that money came from private donors.

The birds’ main summer home is here at the Necedah National Wildlife Refuge
in Wisconsin.

It’s not that the cranes don’t get close to each other. If you watch the cranes here, you can spot single cranes and the occasional couple.

Jeb Barzen pauses to watch two tall white cranes having a territorial dispute:

“Ooh! these birds are threatening each other. that’s a preen behind the wing
threat…that the second bird is doing…so these are not birds of the same
pair.”

Researchers don’t know why the birds are not raising more wild chicks. But
they do have some theories. Even when cranes do make nice and produce an
egg – the relatively young cranes may be too inexperienced to be patient
parents. Black flies may drive the birds off their nest. Or the parents
may be low on body fat and take off to find food.

The crane researchers are gathering data to find out what cranes need for a
successful nesting site. They’re using tracking radios to follow some of the
birds.

Anne Lacy is with the International Crane Foundation. Today she’s driving
around southern Wisconsin listening for the whoopers.

“it’s important to look at what choices they make as a young bird
before they breed…to know how they choose those areas….they need for
water for roosting at night…they need that eventually for nesting.”

This kind of research is being ramped up this spring. That’s because an
independent report raised some concerns about the crane recovery effort.
The report was done by consultants hired by the Whooping Crane Eastern
Partnership. It mentions problems with financial oversight, scientific
coordination, and whether the birds’ main summer home – at the Necedah
wildlife refuge – is the best place for them.

Louise Clemency is with the US Fish and Wildlife Service. And
she is a co-chair of the eastern partnership. She says the crane recovery
effort won’t make any big changes overnight.

“We’re trying to the time to draw the right conclusions so we can
take the right next step.”

Clemency says decisions on the whooping crane experiment could come next
year. In the meantime..she hopes that some crane eggs laid this spring at
the Necedah refuge will hatch.

For The Environment Report, I’m Chuck Quirmbach.

Related Links

Population Control for Cormorants

  • Biologists Jim Farquhar and Mike Smith inspect the cormorant nests in the treetops. (Photo by Karen Kelly)

The pesticide DDT almost wiped
out the double-crested cormorant.
Now, the bird is thriving, and it’s
blamed for devouring fish in lakes,
rivers, and fish farms in many parts
of the country. Karen Kelly reports
on the struggle to share resources
with this unpopular bird:

Transcript

The pesticide DDT almost wiped
out the double-crested cormorant.
Now, the bird is thriving, and it’s
blamed for devouring fish in lakes,
rivers, and fish farms in many parts
of the country. Karen Kelly reports
on the struggle to share resources
with this unpopular bird:

(sound of clanking and birds)

Mike Smith eases a boat into the shallow water just off Little Murphy Island. It’s a tiny patch of sand and trees in the middle of the St. Lawrence River. It straddles the New York border with Canada.

Smith is a wildlife technician with New York’s department of environmental conservation. He specializes in cormorant management. That means he knocks down nests, breaks eggs, and – very occasionally – shoots them.

Before he even jumps off the boat, he starts counting the birds that are poking out of nests in the treetops.

“I see a few. I’m looking at their nests. We tried to have a zero percent successful reproduction rate.”

Smith counts maybe ten nests. They started with 150 or so in the spring.

There are tens of thousands of these birds. They spend their summers in the north. And in the winter, they go south where they raid fish farms.

Biologists estimate each bird eats a pound of fish a day. That can make a dent in the local fish population. The birds also strip trees of their leaves to create nests. And their guano ends up killing the trees’ root systems. That ends up driving out other animals that need vegetation.

Some people feel the birds should be eradicated. One group of anglers was even arrested for killing hundreds of them on Lake Ontario.

There are others, like the group Cormorant Defenders International. They feel they should be protected.

It’s up to biologists like Jim Farquhar of New York’s Department of Environmental Conservation to find the balance between human needs and cormorants.

Farquhar: “We have needs too, as people.”

Karen: “And we’re competing with them.”

Farquhar: “And we’re competing with them in some cases. Hopefully, if we can inject good science, we make good decisions as a result.”

The biologists’ biggest effort has been on Lake Ontario. They’ve been destroying nests there — and killing some adults – for ten years. Farquhar says they’re finally seeing results.

They’ve reduced the cormorant population on the lake by about two-thirds, and the fishing’s improved.

Now, the biologists are trying to have the same success on the St. Lawrence River. But they’ve only seen a 13% decrease in the number of cormorant nests and they’ve been doing it for four years.

Part of the challenge is that most of the birds live on Canadian soil where management is left to the landowner.

Local anglers like Steve Sharland of Ogdensburg, New York, are frustrated with the slow progress.

“They should eliminate them. They’re not a Northern New York bird and what they’re doing to our fisheries is a sin.”

That’s a common misconception. Actually, the cormorant is native to the region but few people have seen them in such large numbers.

Sharland says some people are so frustrated, they’ve been shooting the birds illegally. But Jim Farquhar believes those are isolated incidents.

“Mike just mentioned that we’ve got some black-crowned night herons nesting out here. It’s another species we’re concerned about, and one we’ve been trying to actively protect from the cormorants. So that’s a good sign.”

A good sign. But it’s another species trying to live on this small patch of land. And the biologists’ balancing act has become even more delicate.

For The Environment Report, I’m Karen Kelly

Related Links

Swan Song of the Mute Swans

  • Wildlife officials want to eliminate the European mute swan so it doesn't compete with native birds. (Photo by Christina Shockley)

Controversy over what to do about a non-native swan has taken an
unusual turn. One state that was going to kill all of its mute swans
will now give some of them a short lease on life. It’s going to let
people “adopt” the wild birds. Christina Shockley has the story:

Transcript

Controversy over what to do about a non-native swan has taken an
unusual turn. One state that was going to kill all of its mute swans
will now give some of them a short lease on life. It’s going to let
people “adopt” the wild birds. Christina Shockley has the story:


Mute swans are large, gorgeous, white birds. They were brought to the
U.S. from Europe in the 1800s to beautify parks and estates. The swans
were meant to be kept in captivity, but they escaped, and since, the
numbers have skyrocketed along the Great Lakes and Eastern seaboard.


So, like in other areas, the Wisconsin Department of Natural Resources
has come up with a plan. The state wants to shoot all the mute swans,
but this doesn’t sit well with a lot of people.


Pat Kujawa is one of them. Kujawa is sitting in her home on Phantom
Lake. The area is home to about 85% of Wisconsin’s mute swans. Each
summer for several years, Kujawa’s family has bonded with the mute
swans. She sees the birds as neighbors on the lake.


She holds a photo album full of pictures of the swans and her kids as
they grew up:


“We have pictures of our son Kyle swimming with them, and he’s probably
about I would say 8 or 9 years old, and again other pictures like that,
showing the parents standing back, and all of the babies coming up and
taking bread right out of Kyle’s hands. Sort of suggests that perhaps
the DNR characterization of them being aggressive is somewhat
misguided, or at least it’s what they want people to hear.”


Wildlife officials say the mute swans ARE aggressive, especially during
the nesting and breeding season. They say the mutes push native birds
out of their habitat and upset aquatic life by uprooting vegetation
along the shore.


Officials also say the mute swan was posing a problem as the state
worked to re-introduce the native trumpeter swan. Their numbers have
just recovered.


But because of protests from people like Kujawa, the state government
says it will temporarily modify its mute swan eradication plan. What
they’re doing might seem a little unusual. The state is going to let
people in three counties “adopt,” or sponsor, as many mute swans as they
want.


Erin Celello is from the Department of Natural Resources. She says
people won’t have to bring the birds in the house to live like a cat or
dog, but she says they will have to get the swans fixed:


“They will be able to apply for a permit, to capture a swan from the
wild, and they will be required to neuter that swan, and re-release
that swan into the wild.”


Celello says that will keep the birds from breeding, and the state
won’t shoot the birds when they see them:


“We felt that this is kind of a win-win for everyone. As an agency, we
are still upholding our share of what has become a national mute swan
control policy, while at the same time, allowing for citizens who have
formed emotional attachments to these birds, to keep those birds
around, and keep them on their landscape.”


Celello says the state’s goal is still to kill all of the mute swans. She
says officials will shoot the mutes that aren’t wearing neck tags that
show the birds have been spayed or neutered. And obviously the swans
that have the surgery won’t be having babies. One vet says the spaying
or neutering procedure could cost between 150 and 250 dollars per bird,
and Grace Graham says that might be difficult for her to afford.
Graham is Pat Kujawa’s neighbor on Phantom Lake.


The 70-year-old retired school teacher has been swimming with, and
feeding, the mute swans for years. She says the mute swans should just
be left alone and that it’s wrong to eliminate a species. But she
knows, ultimately, if it’s impossible for the birds to reproduce, the
swans will be gone at some point:


“I don’t want to even think about our lake not having any mute swans on
it. All this summer, the last time I swam with them before the water
got cold I thought, Grace, this is the last time you’re going to get to
do this. Last time you fed them, last time you do all of these things.
It’s kind of like a death thing.”


For the Environment Report, I’m Christina Shockley.

Related Links

Little Fish, Big Fish: Which to Keep?

The common practice of throwing the little ones back could be harming future fish populations. The Great Lakes Radio Consortium’s Christina Shockley reports:

Transcript

The common practice of throwing the little ones back could be harming future fish populations. The Great Lakes Radio Consortium’s Christina Shockley reports:


Anglers and commercial fisheries are often only allowed to take fish that are larger than a certain size. So the smaller fish are left to reproduce. And researchers say that means their offspring will also be smaller, and not as healthy.


David Conover is a marine scientist at Stony Brook University. He says the larger fish are vital to the overall health of their species.


“The eggs that these big, old females produce tend to be of higher quality. The egg diameters may be a little larger, the yolk that is supplied to the eggs seems to be more rich, the larvae hatch at a larger size, they have a higher survival.”


Conover says fish populations can be harmed in as little as three or four generations. And it can take much longer for a population to rebound – if it can at all.


He says possible solutions could include different rules that protect larger fish, and new limits on where fish can be harvested.


For the GLRC, I’m Christina Shockley.

Related Links

Scientists Keep Tabs on Exotic Crab

  • Sightings of the Chinese mitten crab outside of its native habitat make some scientists uneasy that it will turn into an invasive species. (Photo courtesy of the California Department of Fish and Game)

Biologists are asking people to keep their eyes peeled for another potential invader into the Great Lakes. A Chinese mitten crab was found in the St. Lawrence River last fall. The Great Lakes Radio Consortium’s David Sommerstein reports:

Transcript

Biologists are asking people to keep their eyes peeled for
another potential invader into the Great Lakes. A Chinese mitten
crab was found in the St. Lawrence River last fall. The Great Lakes
Radio Consortium’s David Sommerstein reports:


Scientists aren’t sounding the alarm yet. One Chinese mitten crab found near Quebec City doesn’t constitute an invasion. But if they reproduce, the critters could spread quickly.


David MacNeill is a fisheries specialist with New York Sea Grant. He says one was found in Lake Erie in the 1970s, but didn’t proliferate. The mitten crabs spawn in salt water, so they don’t really threaten the upper Great Lakes. But the St. Lawrence River may be better habitat. Regardless, MacNeill says the discovery highlights problems with foreign ships exchanging ballast water before they enter the Great Lakes system.


“Inside ballast tanks on ships, they’re like giant tidal mud flats. When you empty all the water out, there’s this large mud layer. Some of these organisms can burrow into the sediment which is what the mitten crabs do.”


In January, the Coast Guard conceded its ballast discharge rules don’t always work. It said it must find new ways to keep foreign invaders out of the Great Lakes.


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

Related Links

Luring an Invasive Fish With Pheromones

A scientist has discovered a chemical compound that attracts
an invasive fish. The Great Lakes Radio Consortium’s Mike Simonson
reports that this could be a breakthrough in controlling harmful fish
populations:

Transcript

A scientist has discovered a chemical compound that attracts an invasive fish. The
Great Lakes
Radio Consortium’s Mike Simonson reports that this could be a break through in
controlling
harmful fish populations:


Eurasian ruffe were introduced in the Duluth-Superior harbor from ballast water of
ocean-going
ships in the 1990’s. Ruffe reproduced so quickly, they now make up 80 to
90-percent of the fish
population, squeezing out native fish. Now, they’re spreading eastward across Lake
Superior
toward the lower Great Lakes.


University of Minnesota Fisheries Professor Peter Sorenson says he’s isolated a
pheromone that
will cause the fish to cluster in great numbers of male ruffe who are tricked into
thinking it’s time
to mate.


“It causes a great deal of sexual arousal and excitement. So to help detect this
thing, I suppose
like a dog they get a little crazy and just start swimming around like crazy and
nudging and
inspecting the fish in the tank.”


Once they’re clustered, Sorenson says it may be possible to find a way to cut their
population.
Sorenson hopes to find a similar pheromone in carp and sea lamprey, other invasive
species
which threaten native fish in the Great Lakes.


For the Great Lakes Radio Consortium, I’m Mike Simonson.

Related Links

Saving Turtles From Traffic

  • Research assistant Molly Wright on the trail for radio-tagged turtles. (Photo by David Sommerstein)

Driving on country roads can sometimes be like navigating an obstacle course of wildlife – deer, skunks, raccoons, frogs, and throughout much of the summer – turtles. Turtles like to lay their eggs along roadsides and become easy candidates for road kill. They live and reproduce for decades, so when an adult is killed prematurely, it can have a big effect on turtle populations as a whole. Researchers are trying to find out how often turtles cross the road and how to help them get safely to the other side. The Great Lakes Radio Consortium’s David Sommerstein reports:

Transcript

Driving on country roads can sometimes be like navigating an obstacle course of wildlife – deer,
skunks, raccoons, frogs, and throughout much of the summer – turtles. Turtles like to lay their
eggs along roadsides and become easy candidates for roadkill. They live and reproduce for
decades, so when an adult is killed prematurely, it can have a big effect on turtle populations as a
whole. Researchers are trying to find out how often turtles cross the road and how to help them
get safely to the other side. The Great Lakes Radio Consortium’s David Sommerstein reports:


Tom Langen starts his day around 6 in the morning on the shoulder of a two-lane road in northern
New York State. He walks along and counts roadkill.


“We like to get out early before the traffic gets bad, but also before the crows and other animals
have drug everything away.”


When he finds a dead snapping turtle, he nudges it off the road and bends down to study it.


“So this is a female. It’s pretty mangled. Unfortunately I can’t see any of the banding on her
shell.”


Each morning, he’ll find two or three like this. Langen’s a biology professor at Clarkson
University. He specializes in animal behavior. He’s trying to figure out whether a few smooshed
turtles a day is a little problem or a big one for the species as a whole.


His hypothesis is that it is a big problem. Turtles can live more than 60 years. And they have a
higher reproduction rate the older they get.


“So the old individuals are very important, and the older they are, the more important they are.”


Turtles like to live in marshes or ponds. But they like to lay their eggs in drier places. In what
Langen describes as a cruel twist of ecological fate, road berms are perfect. They’re dry, sandy,
and often close to marshes.


“The turtles have evolved over millions of years certain cues of what makes a good nesting site.
And by chance the roads that we’ve built in the last 50 to 75 years have some of those features
that match that so they’re tricked into going to those places.”


To figure out how many turtles are tricked into playing chicken with cars, Langen and his
research assistants catch turtles in nets. They inject them with a tag that identifies each
individual. So when they find a dead one, they know who it is.


They also want to know how far the turtles range. So they attach tiny radio transmitters to turtles’
shells and track their movements. That job falls to research assistant Molly Wright.


“Umm, we’re going to go after a snapping turtle. It’s a snapping turtle that we found in a swamp
by the Grasse River.”


(sound of sloshing water)


It’s known only as “Turtle #6”. Wright slogs waist deep through a marsh just off the highway.
She slings a radio receiver over her shoulder and holds an antenna like the one you’d put atop
your house.


“Yeah. That’s the noise that the radio antenna telemetry device makes for the turtle, so it’s a
pretty distinctive sound. It’s straight in front of us somewhere, the turtle is.”


We trudge slowly past green lilypads into the middle of the marsh. We clutch long grasses to
keep our footing among the muck and submerged logs. Wright sweep the antenna left and right.
She looks like a radio statue of liberty.


“People see us pretty regularly on like their drives to and from work and people bicycle. There’s
one man who pulled over and he’s like, “what’s up with that girl with the antenna on her head?”


“You see that moving right there?” “Yeah.” “That’s the turtle. It’s moving in the lilies.”
“Right there?” “Yup.” “That’s him right there. Turtle #6 has been found.”


Wright jots down the GPS coordinates, water temperature, and other observations in a notebook.
She notices we’re only several feet from the road. Of the 15 turtles she’s tracking, about a third
have crossed.


“I can’t make any conclusions from it because I haven’t done the stats yet, but you see a lot of
dead turtles on the road.”


The team of researchers will compile data over the next three years. They hope to get a sense of
how many turtles live in the area and what percentage of them get run over. Lead scientist Tom
Langen says, ironically, some of these turtles are older than the roads they’re getting killed on.


“It would be a terrible tragedy to remove these animals from our environment and over a brief
period of fifty years because of our traffic activities. I’d like to see those populations preserved
and maintained in good numbers. My daughter likes to see them, and I want her to see them as
well.”


Langen says his research could give road engineers a mandate to design fences, baffles, and
passageways that could keep turtles and other animals out of harm’s way. He cautions drivers to
be careful near wetlands, and if they see a dead turtle, odds are more turtles are trying to cross the
road nearby.


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

Related Links

SAVING TURTLES FROM TRAFFIC (Short Version)

  • Research assistant Molly Wright on the trail for radio-tagged turtles. (Photo by David Sommerstein)

Turtles like to live in wet, marshy areas. But they make their nests in dry areas, like in the gravel on the side of roads. Researchers are trying to determine how many turtles are becoming road kill and what effect that’s having on their populations. The Great Lakes Radio Consortium’s David Sommerstein reports:

Transcript

Turtles like to live in wet, marshy areas. But they make their nests in dry areas, like in the gravel
on the side of roads. Researchers are trying to determine how many turtles are becoming roadkill
and what effect that’s having on their populations. The Great Lakes Radio Consortium’s David
Sommerstein reports:


Biologist Tom Langen spends a lot of time walking along roads in northern New York State. A
professor at Clarkson University, he and his team of researchers catch turtles and put an
identifying tag on each one. So when they find one that’s been run over, they know who it is.


“…and by looking at the number that we find that are hit, and the number that are hit that have
been caught before, we can estimate the population size and what percentage are being hit.”


Langen says killing adult turtles has a big effect on the population because they reproduce for
decades. He says the project could persuade road engineers to build tunnels and other passages.
That way turtles and other animals will be able to cross the road and get to the other side safely.


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

Related Links

Study Reveals Coots Can Count

A new study in the journal Nature reveals that some birds can count. Researchers have found that they’re able to identify and tally their eggs in order to improve their reproductive success. The Great Lakes Radio Consortium’s Sarah Hulett explains:

Transcript

A new study in the journal Nature reveals that some birds can count. Researchers have found that
they’re able to identify and tally their eggs in order to improve their reproductive success. The
Great Lakes Consortium’s Sarah Hulett explains:


Bruce Lyon is a biologist at the University of California Santa Cruz. He made the discovery while
doing research on the reproductive behavior of American Coots. Coots are dark gray, duck-like
waterbirds that live in the northern U-S and southern Canada. They’re parasitic birds. That means
they lay some of their eggs in other coots’ nests – tricking the host birds into incubating eggs that
aren’t theirs.


But Lyon found that some females are able to recognize the foreign eggs by counting and ignoring
the imposters. Lyon says taking care of other birds’ eggs means a slimmer chance of their own
chicks surviving.


“There’s not enough food to go around, and if you end up raising somebody else’s chick, it
probably means you’ve lost one of your own.”


Lyon says a female coot will protect her babies by identifying eggs that aren’t her own, and burying
them or pushing them to the edge of the nest.


For the Great Lakes Radio Consortium, I’m Sarah Hulett.

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.