Tag: adapt

Wily Coyotes in the City

  • Coyotes have started to lose their wildlife habitat, and now they are adapting to cities and suburbs. (Photo courtesy of Michigan Department of Natural Resources)

As wildlife habitat is displaced by subdivisions, some animals are adapting to their new surroundings. That’s created new food for some kinds of predators, such as coyotes. The GLRC’s Lester Graham reports on how their range is expanding:

Transcript

As wildlife habitat is displaced by subdivisions, some animals are
adapting to their new surroundings. That’s created new food for some
kinds of predators, such as coyotes. The GLRC’s Lester Graham reports
on how their range is expanding:


Wile E. Coyote hasn’t always had the greatest life out in the wild.


(Sound of Roadrunner)


So… some coyotes are moving into the city, and why not? There’s a
smorgasbord for coyotes in the city.


(Sounds of ducks and geese)


We’re in Lincoln Park in downtown Chicago. Coyotes are occasionally
sighted around here. Rob Curtis has seen one in his neighborhood a few
miles north of here, but the wildlife photographer had a close encounter
with a coyote here in Lincoln Park.


“Well, I knew that it was living there because people had seen it before,
but I hadn’t seen it. And then, I was trying to photograph a rare bird that
was in front of the fence there and I was camouflaged and it came up
right in front on the other side of the fence without it noticing me, and
then it just walked on.”


The coyotes eat just about anything they can get a hold of: rats, young
geese, squirrels… and… sometimes pets. In the Chicago suburb,
Arlington Heights, coyotes have been a problem.


Police Sergeant Nick Pecora says sometimes coyotes are pretty brazen.


“In the last 18 months Arlington Heights has lost one Yorkshire Terrier,
taken off the patio in the owners presence, and in one case the dog had an
electronic collar on and when the coyote took it, it received a shock and
dropped the animal and ran away.”


Pecora says some Arlington Heights residents haven’t been too keen on
what some see as an intruding predator.


“Coyotes are indigenous to the area and – maybe it’s the perception that
this is a large animal and the bunnies, the skunks, the squirrels, that’s
what Arlington Heights is used to, and a 35-pound animal walking
through your yard, I think they’re perceived as the big, bad wolf, if you
will.”


And… although there hasn’t been a documented case of a coyote
attacking a human… some worry that they might.


Not too far away researchers are putting radio collars on coyotes to see
where they’re going and what they’re doing.


(Sound of tires on gravel)


Justin Brown is with a research project out of Ohio State University.
He’s just located the spot where a coyote is hiding. We can’t see him,
but we know he’s there because of the signal his collar is emitting.


“We very rarely see them, especially during the day. At the night —
during the night, occasionally we’ll get good visuals, but for the most
part during the day times you never see them.”


Brown and his colleagues are trying to figure out why there are more
coyotes in the suburbs and cities. One of the reasons is car and deer
accidents. Coyotes feed on the carcasses. The huge increase in Canada
geese is another reason.


“Food ranges from deer to geese to even just dog food people leave out.
There’s definitely a high variety of foods available to them. For habitat,
it can be anything, any little wood lot, anywhere that they can find a little
hiding spot for the daytime and then during the evenings they run (in) a
lot of areas you wouldn’t expect such as residential areas and
commercial parking lots. They pretty much run it all, anywhere that they
might come across a meal.”


You’d think there wouldn’t be that many places for a coyote to hide in
the city and suburbs. But, Brown says they hide in parks, golf courses, in
wood lots, graveyards… anyplace with a little cover. Brown’s research team
leader, Stan Gehrt, estimates there are something like two-thousand coyotes
in the Chicago metro area.Justin Brown says the truly amazing thing is that
coyotes have learned to adapt so well… and even survive a lot of automobile
traffic.


“We’ve actually seen animals where they’re actually figuring out traffic
patterns. They know which roads are going which ways. We’ll see them
cross roads where they’ll actually look only the direction traffic should
be coming and then go and then stop in the middle and look in the other
direction for traffic and then go. So, they’ve definitely figured out how
the road systems work. It’s just amazing to see how they survive in this
environment.”


And, the experts say, the coyotes are probably here to stay. Most
residents don’t want the police to shoot the animals. So some
municipalities tried to trap and relocate the animals to a more rural area,
but coyotes are very territorial, and they immediately head back to the
place where they were trapped. Often they’re hit by cars on the journey
back, but sometimes they make it home, and the predator in the suburbs
is back and hungry.


For the GLRC, I’m Lester Graham.

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Ten Threats: Predicting New Invaders

  • Some say it's only a matter of time before the Asian Carp enters the Great Lakes. (Photo courtesy of the USFWS)

More than 160 kinds of foreign creatures are in the Great Lakes right now, and every few months, a new one finds its way into the Lakes. Those invasive species are considered the number one problem by the experts we surveyed. The outsiders crowd out native species and disrupt the natural food chain, and it’s likely more will be coming. Zach Peterson reports scientists are putting a lot of time and effort into figuring out which new foreign creatures might next invade the Great Lakes:

Transcript

There are new problems for the Great Lakes on the horizon. The Great Lakes Radio Consortium’s Lester Graham is our guide in a series that explains that new invasive species are one of the Ten
Threats to the Great Lakes:


More than 160 kinds of foreign creatures are in the Great Lakes right now, and every few months, a new one finds its way into the Lakes. Those invasive species are considered the number one problem by the experts we surveyed. The outsiders crowd out native species and disrupt the natural food chain, and it’s likely more will be coming. Zach Peterson reports scientists are putting a lot of time and effort into figuring out which new foreign creatures might next invade the Great Lakes:


(Sound of boat motor)


Jim Barta is a charter boat captain just above Lake Erie on the Detroit River. He says over the last decade, zebra mussels and other foreign species have altered the habitat of the walleye he fishes for.


Water that once had a brownish hue is now clear. That’s because Zebra mussels have eaten the algae and plankton that used to cloud the water, and that means Barta’s boat is no longer invisible to the fish he aims to hook.


“You could catch the fish a little closer to the boat because they weren’t as spooked by the boat. They weren’t as afraid of what was taking place.”


So Barta had to rethink his tactics. He now casts his lines out further, and he’s changed lures to continue catching walleye.


But there are other problems the zebra mussel is causing. Eating all the plankton means it’s stealing food at the bottom of the food chain. And, that affects how many fish survive and how much the surviving fish are able to grow.


Anthony Ricciardi is trying to help Barta, and other people who rely on a stable Great Lakes ecosystem. He’s an “invasion biologist” at McGill University in Montreal.


Ricciardi looks for evidence that can predict the next non-native species that might make it’s way into the Great Lakes. He says species that have spread throughout waterways in Europe and Asia are prime candidates to become Great Lakes invaders.


“If the organism has shown itself to be invasive elsewhere, it has the ability to adapt to new habitats, to rapidly increase in small numbers, to dominate ecosystems, or to change them in certain ways that change the rules of exsistence for everything else, and thus can cause a disruption.”


Ricciardi says most aquatic invasive species are transported to North America in the ballast tanks of ocean freighters. Freighters use ballast water to help balance their loads. Some of the foreign species hitchhike in the ballast water or in the sediment in the bottom of the ballasts.


Ships coming from overseas release those foreign species unintentionally when they pump out ballast water in Great Lakes ports. Ricciardi says one of the potential invaders that might pose the next big threat to the Great Lakes is the “killer shrimp.” Like the Zebra Mussel, it’s a native of the Black Sea.


“And it’s earned the name killer shrimp because it attacks invertebrates, all kinds of invertebrates, including some that are bigger than it is. And it takes bites out of them and kills them, but doesn’t necessarily eat them. So, it’s not immediately satiated. It actually feeds in a buffet style: it’ll sample invertebrates, and so it can leave a lot of carcasses around it.”


Ballasts on cargo ships aren’t the only way foreign species can get into the Lakes. Right now, scientists are watching as a giant Asian Carp makes its way toward Lake Michigan. It’s a voracious eater and it grows to a hundred pounds or more.


This non-native fish was introduced into the Mississippi River, when flooding allowed the carp to escape from fish farms in the South. A manmade canal near Chicago connects the Mississippi River system to the Great Lakes.


If it gets past an electric barrier in the canal, it could invade. Many scientists believe it’s just a matter of time. Another invasive, the sea lamprey, also got into the Great Lakes through a manmade canal.


But, researchers don’t usually know when or where an invader will show up. David Reid is a researcher for the Great Lakes Environmental Research Laboratory in Ann Arbor. He says they can’t predict the effect an invader will have when it arrives in its new ecosystem.


“That’s the problem. We don’t know when the next zebra mussel’s going to come in. We don’t know when the next sea lamprey type of organism is going to come in. Generally, if you look at the invasion history of the Great Lakes, you’re seeing about one new organism being reported probably about once every eight months.”


Knowing what the next invader might be could help biologists, fisheries experts, and fishermen know what to do to limit its spread. Invasional biologists hope that their work will help develop the most effective measures to limit harm to the Great Lakes.


For the GLRC, I’m Zach Peterson.

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