Tag: mussels

Acidic Oceans Dissolving Shellfish Industry

  • Oceanographer Richard Feely says the shellfish industry is suffering in part because the more acidic seawater encourages the growth of a type of bacterium that kills oyster larvae.(Photo courtesy of the NOAA)

When carbon dioxide is released into the atmosphere, about a third of it absorbs into the ocean. That creates carbonic acid—the stuff in soda pop that gives it that zing.

That means seawater is becoming more acidic.

Scientists say this ocean acidification is starting to cause big problems for marine life. And Ann Dornfeld reports that could affect your dinner plans.

Transcript

When carbon dioxide is released into the atmosphere, about a third of it absorbs into the ocean. That creates carbonic acid—the stuff in soda pop that gives it that zing.

That means seawater is becoming more acidic.

Scientists say this ocean acidification is starting to cause big problems for marine life. And Ann Dornfeld reports that could affect your dinner plans.

Taylor Shellfish Farms has been growing oysters for more than a
century. And shucking them, one by one, by hand.

“An old profession. Y’know, they’ve tried for years to
find a way to mechanize it. There’s no way around it. Every oyster is
so unique in its size and shape.”

Bill Dewey is a spokesman for Taylor. The company is based in
Washington state. It’s one of the nation’s main producers of farmed
shellfish. Dewey says if you order oyster shooters in Chicago, or just
about anywhere else, there’s a good chance they came from Taylor.

But in the past couple of years, the company has had a hard time
producing juvenile oysters – called “seed.”

“Last year our oyster larvae production was off about 60
percent. This year it was off almost 80 percent. It’s a huge impact to
our company and to all the people that we sell seed to.”

Shellfish growers throughout the Pacific Northwest are having similar
problems with other kinds of oysters, and mussels, too. They suspect a
lot of it has to do with ocean acidification.

Richard Feely is a chemical oceanographer with the National Oceanic
and Atmospheric Administration. He says when the pH of seawater drops
too low, it can hurt marine life.

“What we know for sure is that those organisms that
produce calcium carbonate shells such as lobsters, and clams and
oysters, and coral skeletons, they generally tend to decrease their
rate of formation of their skeletons.”

Feely says it looks like acidified waters are affecting oysters
because their larvae build shells with a type of calcium carbonate,
called aragonite, which dissolves more easily in corrosive water.

The more acidic seawater also encourages the growth of a type of
bacterium that kills oyster larvae.

Feely says the changes in the ocean’s pH are becoming serious. He
recently co-published a study on the results of a 2006 research cruise
between Hawaii and Alaska. It was identical to a trip the researchers
took in 1991. They found that in just 15 years, the ocean had become
five to six percent more acidic as a result of man-made CO2.

“If you think about it, a change of 5% in 15 years is a
fairly dramatic change. and it’s certainly humbling to see that in my
lifetime I can actually measure these changes on a global scale. These
are very significant changes.”

A couple years ago, Feely gave a talk at a conference of shellfish
growers. He explained the impact ocean acidification could have on
their industry. Bill Dewey with Taylor Shellfish Farms was there.

“All these growers were walking around with all these
really long faces, just very depressed. I mean it was a very eye-opening presentation and something that’s definitely had growers
paying attention since, that this could be a very fundamental problem
that we’re going to be facing for a long time to come.”

Dewey calls shellfish growers the “canary in the coalmine” for ocean
acidification.

Scientists say if humans don’t slow our release of CO2 into the
atmosphere, shellfish may move from restaurant menus into history
books.

For The Environment Report, I’m Ann Dornfeld.

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How the West Was Warned

  • Wen Baldwin, a volunteer with the National Park service, pulls a non-stick teflon frying pan out of Lake Mead, the reservoir of Hoover Dam. Quagga mussels smothered the pan in a matter of weeks. (Photo by Shawn Allee)

A tiny aquatic pest called the
quagga mussel is invading lakes
and streams across the country.
It’s even clogging up pipes in
some big-city water systems, dams,
and power plants. When environmental
disaster strikes, sometimes people
scratch their heads and ask: how
could this happen? Shawn Allee reports, in the case of
one quagga mussel invasion, people
got plenty of warning:

Transcript

A tiny aquatic pest called the
quagga mussel is invading lakes
and streams across the country.
It’s even clogging up pipes in
some big-city water systems, dams,
and power plants. When environmental
disaster strikes, sometimes people
scratch their heads and ask: how
could this happen? Shawn Allee reports, in the case of
one quagga mussel invasion, people
got plenty of warning:

n 2007, biologists declared that quagga mussels had infested infested Lake Mead just outside
Las Vegas.

But years before that, park staff and volunteers like Wen Baldwin told folks how to avoid the
problem.

Baldwin says some people helped – most people told him to just drop it.

“Oh, it won’t happen to us. That’s the American theory – fire, cancer, whatever. Oh, it
won’t happen to me.”

But it did happen, and here’s how it went down.

Baldwin went to this conference out East where biologists explained how quaggas clog pipes at
water treatment centers and power plants.

“There was a presentation about them and I realized, hey, they could get in here and they
could cost me money, you money, everybody money. They could raise havoc as they have in
the Great Lakes.”

Baldwin got worried.

Quagga mussles hitchhike on boats, and Lake Mead is a boating hot spot.

Baldwin warned people – wash down your boat before you put it in the lake!

“I put on a lot of programs trying to get people on board. Just didn’t work that well.”

Now, quagga mussels are making a mess of Lake Mead – and Web Baldwin can show how.

Baldwin tests how well quagga stick to different material.

We’re on this dock one morning, and he pulls a rope out of the water.

The rope’s covered with shells that look like fingernail-sized clams.

Allee: “I reckon you have to be pretty careful with your hands, there.”

Baldwin: “Boy, they’ll cut you to ribbons. I go home looking like my hands went through a
meat grinder.”

At the end of the rope – he’s tied a skillet.

Baldwin: “They’ll stick to teflon.”

Allee: “They’ll stick to teflon. Your eggs won’t stick to teflon all that well, but quagga
mussels will.”

Baldwin: “They will. And anywhere they attach the glue they use will hasten the
deterioration of the surface they attach to.”

A quagga-coated teflon pan is a shocker – but what does a quagga invasion mean?

Well, for one, if you dock your boat at Lake Mead – you’ve gotta scrape it all the time.

Swimmers wear shoes to protect their feet from quagga-coated rocks.

And quagga are getting costly.

Zegers: “We’ve been monitoring water quality in the lake pretty extensively.”

Roefer: “These are the six locations we collect samples at.”

I’m with Ron Zegers and Peggy Roefer. They’re with the Southern Nevada Water System. It
provides water to Las Vegas and other cities.

They walk me through slides divers took near water intake pipes – deep in Lake Mead.

Roefer: “And this is where our intake is, on Saddle Island. This is actually the inside of the
rock structure you can see the quaggas on the inside of that. Quagga mussels were
approximately two inches thick.”

Zegers and Roefer say they’re trying plenty of things to keep quagga out of the water supply.

The first is the old stand-by: chlorine.

But too much chlorine can make people sick.

Zegers: “More of those disenfection byproducts form, which puts us closer to our
regulatory compliance issues, so we also have to be concerned about that also.”

Roefer: “You know we’re watching the alternative control strategies, the bio-bullets and
pseudo-flourence and those kinds of things.”

Allee: “Sounds like an arms race.”

Roefer: “Yeah, who can get there first. The annual for this is one to four million dollars.”

Allee: “One to four million dollars. You know, you could clean a lot of water if you didn’t
have to deal with these critters.”

Zegers: “That’s correct. Now it’s just an anticipated expenditure that certainly wasn’t
budgeted for when they first appeared, and now it’s just gonna be a way of life.”

And it could become a a way of life for more lakes if we don’t stop quaggas from spreading
around.

For The Environment Report, I’m Shawn Allee.

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Tiny Pest Threatens the Las Vegas Lights

  • Hoover Dam's backside stretches more than 700 feet from top to bottom, but the dam's seeing trouble from the tiny aquatic zebra mussel. (Photo by Shawn Allee)

Hoover Dam generates some of the power that lights Las Vegas all night long. But there’s something
that’s making that job a bit more difficult. Shawn Allee found out, it’s a tiny aquatic pest:

Transcript

Hoover Dam generates some of the power that lights Las Vegas all night long. But there’s something
that’s making that job a bit more difficult. Shawn Allee found out, it’s a tiny aquatic pest:

The usual tour of Hoover Dam starts at the visitor’s center – way at the top.

Robert Walsh works with the federal agency that runs Hoover.

He says, go ahead – look over the edge.

Allee: “OK. That’s creepy. Seriously, that’s creepy.”

Walsh: “It’s spooky. Are you afraid of heights?”

Allee: “No, they don’t bother me at all.”

The dam stretches down 700 feet, and it holds an enormous reservoir – Lake Mead.

This tour is awesome, but Walsh says there’s another tour, too.

It’s, um, NOT so awesome.

It’s all about the trouble the tiny quagga mussel is causing Hoover and other nearby dams.

To get that tour, Walsh takes me to Leonard Willet.

Allee: “Where are we right now?”

Willet: “It’s kind of a work station where all the quagga mussel control activities take place
for Hoover Dam.”

Allee: “It’s quagga mussel central for this area?”

Willet: “Exactly.”

Willet first heard quagga mussels were growing in the nearby Lake Mead reservoir in 2007.

He called an expert for advice.

“First thing out of her mouth was, ‘I’m sorry to hear that.’ I knew it was a lot more serious.
And I asked her what we’re in for.”

Willet learned quickly enough – quagga mussels attach to nearly anything underwater.

He shows me a sandal that was in water – and is smothered in them.

They’re like clams the size of your pinky fingernail.

“We went from zero to THAT in seven months.”

And that’s the problem.

Hoover Dam uses water from Lake Mead to spin generators.

The water moves around in pipes – and quagga mussels can attach to them – just like on that sandal.

Allee: “What does that mean in a real practical sense?”

Willet: “Our intake towers would close off. Once you start closing off, you can’t spin the
generators. That’s just kind of the big view of it.”

Zero power generation.

That’s the worst-case scenario. It hasn’t happened – but it’s a fight to prevent it.

“Now, we’re going to go down to the third floor, which is the generator floor.”

The generators are inside broad metal cylinders.

Big water pipes turn the generators. Smaller ones cool them off.

“Well, we circulate cold water from those pipes. If those start to plug up with mussels, then
you can’t keep a generator cool, if those … it shuts down due to overheating.”

Right now, it takes a lot of scraping to keep everything clear.

All this effort’s adding up – Willet says he’ll spend 2 million dollars soon on new equipment.

Even with that, Willet is still a bit jittery about some pipes outside, at the very bottom of the dam.

“The one that’s probably the scariest of all is, we have a fireline that runs around here.
Mussels love it. Then, your firelines, when they’re needed, are plugged with mussels. So
that’s another area you have to really be careful of, safety-wise.”

This didn’t have to happen.

Quagga mussels invaded eastern rivers and the Great Lakes first.

Experts figure the mussels hitched a ride West on someone’s fishing boat.

Apparently – someone didn’t clean their boat properly – and mussels dropped into Lake Mead.

Allee: “When they built this amazing structure during the Depression, do you think they had
any idea that something like this could ever happen?”

Willet: “I think there was a lot of disagreement among professionals that a little mussel the
size of your finger nail could impact a large hydro facility, but we’re quickly learning a bunch
of them can impact water and power delivery.”

Willet says if boaters aren’t careful – they’ll spread quagga mussels to the Pacific Northwest, where
there’re lots of dams and hydro power plants.

After all, if it can happen at mighty Hoover Dam – it could happen anywhere.

For The Environment Report, I’m Shawn Allee.

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A Silver Bullet for Zebra Mussels?

  • Zebra mussels were discovered 20 years ago, and have since spread across the country (Photo courtesy of the US Fish and Wildlife Service)

Researchers say they’ve found something
that will kill invasive zebra and quagga mussels.
The mussels got into the US in the ballast of
foreign ships. Since then they’ve spread throughout
the country. Rebecca Williams reports:

Transcript

Researchers say they’ve found something
that will kill invasive zebra and quagga mussels.
The mussels got into the US in the ballast of
foreign ships. Since then they’ve spread throughout
the country. Rebecca Williams reports:

So, let’s say you have a nasty pest, an invasive species. Then someone says, we can get rid of that
pest and it looks like there’s no environmental downside.

“It kinda sounds like snake oil. But it’s true.”

That’s Dan Molloy with the New York State Museum lab. He’s come up with a
way to kill zebra and quagga mussels.

Molloy says a strain of common bacteria is toxic to zebra and quagga
mussels. And, even if the bacteria are dead, they can still kill the
mussels.

“You know maybe horror stories of people applying biocontrol agents. And it
had effects they didn’t anticipate. We’re applying dead cells. And they’re
just as effective live or dead.”

It’s great news for power plants, because the mussels clog up intake
pipes.

But it’s not clear if the bacteria can kill mussels in open water.

For The Environment Report, I’m Rebecca Williams.

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Zebra Mussels 20 Years Later

  • (Photo courtesy of the US Fish and Wildlife Service)

The invasive zebra mussel has disrupted food chains and
caused billions of dollars in damage across the country. This
year marks the twentieth anniversary of the discovery of zebra
mussels. Mark Brush reports:

Transcript

The invasive zebra mussel has disrupted food chains and
caused billions of dollars in damage across the country. This
year marks the twentieth anniversary of the discovery of zebra
mussels. Mark Brush reports:

The invasive mussels first arrived here in the ballast water of foreign ships. The mussels
are really good at filtering food out of the water column – such as algae and zooplankton –
food that would eventually go to fish.

David Jude is a research scientist at the University of Michigan. He says, 20 years later,
researchers are still fighting a perception that zebra mussels are good for the
environment. That’s because the mussels do make the water clearer.

“Well if you get clear water that means that some of the algae and some of the
zooplankton that are in that water, that are part of the food chain, that are fueling our fish are going to be destroyed, degraded and
damaged.”

The Great Lakes have been hit hard by the invasive zebra mussels – and by their close
cousins – known as quagga mussels. Jude says in many places popular sport fish such as
salmon and yellow perch are having a tough time finding enough food to survive.

For The Environment Report, I’m Mark Brush.

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Citizen Lawsuit Targets Foreign Ships

  • Ocean vessel loading grain at elevator in Superior, Wisconsin. Nine foreign ships have been identified in the lawsuit against international shipping companies. (Photo by Jerry Bielicki, USACOE)

For decades foreign ships have brought tiny stowaways – called invasive
species – into the United States. And once they get loose, they upend
ecosystems and cause billions of dollars in damage. The shipping
industry has yet to seriously address the problem, and now conservation
and environmental groups are suing the companies they say are most at
fault. Mark Brush has more:

Transcript

For decades foreign ships have brought tiny stowaways – called invasive
species – into the United States. And once they get loose, they upend
ecosystems and cause billions of dollars in damage. The shipping
industry has yet to seriously address the problem, and now conservation
and environmental groups are suing the companies they say are most at
fault. Mark Brush has more:


In 1988, the now infamous zebra mussel slipped out of a ship’s ballast
tank near Detroit. It didn’t take long for it to spread, first
throughout the Great Lakes, then through the Ohio and Mississpi rivers,
then on to Alabama and Oklahoma, and now it’s as far west as Nevada.


The mussels clog up intake pipes at water and power plants and mess up
the food chain. In some places in the Great Lakes, they’ve severely
damaged the sport fishing industry.


And that’s the damage just one foreign pest can do. More than a
hundred have gotten in and more are on the way. The government has
done little to stop the spread of these pests from foreign ships. In
2005, a federal court in California ordered the EPA to set up a system.
The EPA appealed that ruling.


Andy Buchsbaum is the Director of the National Wildlife Federation’s
Great Lakes office. He says ballast water from foreign ships should be
regulated:


“The law is very clear. The Clean Water Act says you cannot discharge
pollution into navigable waters, like the Great Lakes, without first
obtaining a permit. Period. Any discharge without a permit
is illegal.”


So, instead of waiting for the EPA to act, several environmental and
conservation groups, including Buchsbaum’s group, say they are planning
to sue several shipping companies that operate ocean-going boats on the
Great Lakes. They’re targeting nine boats they feel are the biggest
violators.


Industry representatives have said that ballast water regulations would
hurt international shipping, but in the Great Lakes, it’s estimated
that ocean-going ships make up only 6% of the overall tonnage.


Joel Brammeier is with the Alliance for the Great Lakes, one of the
groups that intends to sue the ship owners. He says a few ocean-going
boats have caused a lot of damage:


“The cost savings that we’re seeing from allowing unregulated ocean
shipping on the Lakes pales compared to the economic burden that
invasive species are placing on the Lakes. That’s stunning. The
ocean-going shipping industry is actually bringing in less than the
region is losing because of the things that ocean going ships
unintentionally bring in.”


The environmental and conservation groups who intend to sue say there
are ballast water cleaning technologies available now. The National
Wildlife Federation’s Andy Buchsbaum says they’re willing to back off
their lawsuit if the ship owners promise to clean up their ballast
water:


“This legal action is not designed to shut down the shipping industry
in the Great Lakes. That is not our intention. Our intention is to
get these guys to comply with the Clean Water Act. And that means
putting on treatment technology and getting permits.”


The shipping industry says it needs more time. Steve Fisher is with
the American Great Lakes Ports Association. He concedes there are some
technologies to clean up ballast water:


“I’ll be very frank with you. There’s technologies out there that will
do something.”


(Brush:) “So, why not use those?”


“Because a ship owner needs to know how high the bar is before he jumps
over it.”


In other words the ship owners won’t clean up their ballast water until
the federal government tells them how clean is clean, and so far, the
federal government hasn’t done that.


The EPA and the shipping industry say they’re working on the decades
old problem, but the groups that intend to sue say they’re not moving
fast enough. More invasive species are getting in. They’re hoping the threat of a
lawsuit will help force more action sooner.


For the Environment Report, I’m Mark Brush.

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The Invasion of the Quaggas

  • A close-up of the quagga mussel. Quaggas have spread in all of the Great Lakes except Lake Superior. (Photo courtesy of the Michigan Sea Grant Archives)

Whitefish is a main dish for everything from fish boils to fancy dinners all around the Great Lakes region. But in some areas of the Great Lakes, whitefish aren’t doing so well. Rebecca Williams reports on what’s happening to the fish many people love to eat:

Transcript

Whitefish is a main dish for everything from fish boils to fancy dinners all around the Great Lakes region. But in some areas of the Great Lakes, whitefish aren’t doing so well. Rebecca Williams reports on what’s happening to the fish many people love to eat:

(sound of knives getting sharpened and fish being filleted)

Mike Monahan sells fish from all over the world at his seafood market. But he says whitefish is a very popular seller.


“It’s been there forever, and everybody just expects it to be there, and it’s inexpensive. But really it’s a great fish, as far as a nice light delicate fish, I’d put it up against the soles and flounders.”


Monahan says he’s still getting good supplies of whitefish. So, for now, he’s happy.


But some of the people who catch whitefish are worried. Commercial fishers have been hauling in skinnier whitefish in some parts of the lakes. It’s taking whitefish longer to grow to a size worth selling. And in some cases, the fish aren’t fat enough to make a good fillet.


(sound of shorebirds)


Paul Jensen fishes for whitefish in Lake Michigan. He says lately, he’s had to move his boat to deeper waters. That’s because whitefish are hungry and they’re swimming out deeper. They aren’t finding their favorite food. It’s a little shrimp-like creature called Diporeia.


“Diporeia are probably like a Snickers bar to whitefish; they were high in fats, high in lipids and it was their main food – it was very nutritious for them and it affected their growth rate. Eating Diporeia a fish could reach maturity maybe in 18 months or 2 years. Now we’re looking at fish that may take 5 years to get there.”


Whitefish are not eating Diporeia because it’s vanishing. In some places, researchers used to find 10-thousand of the little critters in a square meter of sediment. Now there are very few, or none at all.


Tom Nalepa has been trying to figure out why. Nalepa is a biologist with the National Oceanic and Atmospheric Administration’s Great Lakes Environmental Research Lab.


“It’s a real scientific puzzle as to why Diporeia is declining. It’s definitely related to the spread of quagga mussels and zebra mussels but that exact negative relationship is kind of elusive at this point in time.”


But Nalepa says he’s sure the invasive mussels are to blame. The mussels got into the Lakes in the ballast tanks of foreign ships. And they’ve spread in all the lakes except Superior.


Tom Nalepa says he’s seen populations of Diporeia crash right around the time the mussels were booming. Nalepa says now, Diporeia’s gone from large areas in most of the Lakes.


That’s bad because Diporeia is an important food source for most of the fish in the Great Lakes.


But for whitefish it’s really crucial. Back in the good old days, Diporeia made up about 80% of their diet.


Tom Nalepa says whitefish are trying to find something else to eat. He’s seeing them switch to a snack food that could make them even skinnier.


They’re starting to eat quagga mussels.


“When whitefish feed on quagga mussels they have to deal with the shell which has no energy content at all and it has to pass the shells through its digestive system so basically the fish feels full when it’s not getting any energy source.”


Nalepa says to the fish, quagga mussels must seem like good food, because there are lots of them.


He says quagga mussels are booming, because they can live in harsher conditions than zebra mussels can. So biologists are predicting quaggas will be even worse for the lakes than zebra mussels.


“Where are things ultimately going to end up? People may just have to get used to fewer fish. Because basically now we’re trading the fish community for the mussel community. The lakes are loaded with mussels instead of fish now. It may be just the way it’s gonna be.”


Some fishermen are already seeing things change. One day last season, Paul Jensen pulled in some of his nets. He was expecting fish.


“It was kind of startling because the amount of quagga mussels that came up with those nets far exceeded the catch of fish. And we hadn’t really equipped the boat with a snow shovel to shovel quagga mussels out of the boat. The impacts are startling because you begin to wonder, if our little net caught these, how many are there and what are the impacts going to be down the road?”


Jensen says he wishes the invaders had never gotten into the lakes in the first place, because there’s no way to predict what effect they’ll have next.


But some scientists worry these changes at the bottom of the food chain will lead to a major collapse of the fish stocks that many people depend on.


For the Environment Report, I’m Rebecca Williams.

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Public Outcry Absent From Invasives Problem

  • Government, industry, and activists work to inform people about individual threats of non-native invasive species. However, there is no comprehensive approach to reducing biological contamination of the Great Lakes region.

One of the biggest environmental problems facing the Great Lakes is the introduction of foreign plants and animals. Invasive species such as the zebra mussel are causing havoc to the lakes. Local, state, and federal governments know about the problems. But there’s not been much public pressure on the governments to do much about them. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

One of the biggest environmental problems facing the Great Lakes is the introduction of
foreign plants and animals. Invasive species such as the zebra mussel are causing havoc
to the lakes. Local, state, and federal governments know about the problems. But there’s
not been much public pressure on the governments to do much about them. The Great
Lakes Radio Consortium’s Lester Graham reports:


Here’s a factoid for you. In the United States alone in the 1980’s and ’90’s, it’s estimated
that it cost more than two-billion dollars to keep zebra mussels from clogging up water
intake pipes. Two-billion! Guess who paid for that? You did – in higher bills.


Zebra mussels are an invasive species. That is, they are native to a foreign place and they
were transported here – like many invasives – by a ship. Zebra mussels were sucked up in
ballast water in a foreign port and then pumped out in a Great Lakes port. The zebra
mussels have spread all over the Great Lakes, in huge numbers. They attach to
everything, including intake pipes. They’ve crowded out native mussels. And zebra
mussels eat the microscopic plant life at the bottom of the food chain, making fish more
scarce and causing fish prices to go up.


And that’s just the beginning. There’s been something like 160 invasive species such as
foreign fish, aquatic nuisances, plants, and insects brought into the Great Lakes region
one way or another and each one has caused problems. Dutch elm disease kills trees. A
fish called round goby eats the eggs of native sport fish. Invasive mites are killing off
honey bees.


“People aren’t outraged about it. And they’re not outraged about it because, I think, we in
the public interest community and the government side haven’t done what it takes to
clearly communicate why this is a problem to people.”


Cameron Davis is with the Lake Michigan Federation, an environmental group that
works to get policies changed in the Great Lakes basin. Davis says most of the time
people just don’t understand that because the government is not doing enough to stop
invasive species from entering the country, it ends up costing them and takes a toll on the
natural environment.


“When zebra mussels, for example, get into drinking water intakes, municipalities have to
pay to keep those things out of there. That means higher rates for you and me. For other
people, fishing is impacted. Invasive species getting into the lakes can mean competition
for those native species like yellow perch because of round gobies, because of zebra
mussels and other invasive species getting into the Great Lakes.”


The government agencies which work on these kinds of problems know about them and
some things have been done to try to prevent new invasive species from being introduced
or control them once they’re here.


Tom Skinner is a regional administrator for the U.S. Environmental Protection Agency
and also heads up the EPA’s Great Lakes National Program Office. Skinner says there
are several obstacles to stopping the invasions.


“One is identifying all the possibilities out there. Two is identifying how they get into the
lakes. Three is coming up with a technical solution to deal with the invasive nature of the
species. And four is getting the resources to make sure that you put the technical
solutions into place.”


And there’s another problem – government agencies, much like people, tend to deal with
one problem at a time. For example, sea lampreys entered the Great Lakes after a canal
was opened. They decimated lake trout populations. Government agencies attacked that
problem. Asian carp are threatening to spread from the Mississippi River system into the
Great Lakes through a canal. Government agencies are putting up barriers. One problem
equals one fix.


Tom Skinner’s counterpart in Canada, John Mills with Environment Canada, says
governments are beginning to realize that stopping the spread of invasive species cannot
just be fixed one problem at a time.


“It isn’t a simple problem of just focusing in on ballast water. It’s a much broader
problem. You can get organisms coming in on wood or other commodities that will take
up residence in the basin and create havoc.”


So, there are lots of ways for invasive species to enter the Great Lakes region. But the
Lake Michigan Federation’s Cameron Davis says no one seems to be looking at the
overall problem.


“We’ve got a number of different gateways to get into the Great Lakes, but we have all
kinds of different departments looking at A) individual gateways, or B) looking at
individual species. Nobody’s really there to pull it all together. We have a big
institutional problem that way.”


And there’s no one movement among environmental groups or consumer groups to
pressure the governments to step back and look at the policies that allow shipping and
trade to continue to easily transport invasive species into the Great Lakes region.


The EPA’s Tom Skinner says government agencies are working on it.


“We’re going to continue to work with the Coast Guard, with the Corps of Engineers,
with our friends to the north in Canada and try and come up with a comprehensive
solution to these various invasive problems. But, it’s easy to say; it takes a great deal of
work and effort to do that.”


And government agencies are not getting any real kind of public pressure to do it because
the public doesn’t realize the price it’s paying for invasive species.


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

Zebra Mussels Endanger Historic Shipwrecks

For years, biologists have warned that non-native zebra mussels threaten plant and animal species throughout the Great Lakes. Now, underwater archeologists say the mussels are also damaging historic shipwrecks. The Great Lakes Radio Consortium’s Brian Mann visited an underwater museum on Lake Champlain and has our story:

Transcript

For years, biologists have warned that non-native “zebra mussels” threaten
plant and animal species throughout the Great Lakes. Now, underwater
archeologists say the mussels are also damaging historic shipwrecks. The Great
Lakes Radio Consortium’s Brian Mann visited an underwater museum on Lake Champlain and has our story:


It’s mid-afternoon and a haze floats over the dark green water, as dive-master Doug
Jones ties his boat to a yellow buoy. New York’s Adirondack mountains rise in the distance, but our destination this morning lies below the waves. Forty feet down on the silty bottom sits the wreck of a ship known as the Burlington Bay Horse Ferry…


“I suggest you do a tour around the wreck. It is possible to duck underneath part
of the decking that’s there. Please don’t, okay. It’s very fragile, especially the spokes to the paddlewheels that are sticking out. So buoyancy control is really important.”


The horse-powered ferry is one of six ships in Lake Champlain’s Underwater
Historic Preserve. Underwater sites like this one are sprinkled throughout
the Great Lakes. From commercial barges to warships, archeologists say
these wrecks hold a vital part of the region’s history.


(Respirator check and dive master chatter)


Perched on the dive platform, I go through a final equipment check. I’m
sheathed from head to toe in a wet suit, insulation against the cold water.


(big splash)


“Now come on over here and hang onto the buoy.”


Here on the lake, each wreck has its own buoy and a network of guide ropes.
Before the ropes were installed, divers sometimes bumped against the ships’
fragile timbers. After a pause to get my bearings, I slip below the
surface.


(Air bubble ambience)


Looking down, I see the buoy chain dwindle away into shadow. As I descend,
the water is cold and thick. Forty feet down, I reach the bottom. A dozen
strokes with my flippers and there it is, a man-made shape forming itself
out of shadows and watery dust.


I glide slowly past the delicate spokes of the paddle wheel. I drift above
the intricate, exposed ribbing of the deck.


“The horse ferry is the only known example of this type of vessel in North
America.”


Chris Sabick is Director of Conservation at the Lake Champlain Maritime
Museum, where they’ve built a half-scale model of the ship and its complex
gears.


(Paddlewheel sound)


Sabick: “It was a vessel type that was fairly widespread during the
19th century. But it’s one of those vessel types that has slipped
through the cracks of history and just kind of faded away.”


The lake’s murky water preserved the horse ferry. The fresh water is cold
and calm. The silt actually protects artifacts from bacteria. In many parts of
the Great Lakes, ships like this one have rested for centuries, completely
intact.


(Shells rattling)


But now that’s changing. A box of tiny, brown and white shells has been
added to the Maritime Museum’s display. It’s a new organism – the zebra mussel.
They arrived in the Great Lakes in the late 1980s, carried in the ballast
tanks of ships. Zebra mussels have wreaked havoc on native fish and plant
species. But they’ve also coated hundreds of historic wrecks:


Sabick: “The enormous weight of hundreds of thousands of these
shells on water-logged wood can obviously cause things to collapse.”


Using wrecks like the Horse Ferry, scientists throughout the Great Lakes are
studying ways that zebra mussels actually change the water’s protective
chemistry:


Sabick: “It seems that the microenvironment that exists deep inside the mussel
layer or colony attracts a type of bacteria that accelerates the
degradation of the iron. And obviously all of these shipwrecks are fastened
with iron fasteners.”


Over time, the wrecks could literally come apart at the seams.


(water bubbles)


Back in the water, I draw close to the horse ferry’s bow. Thick layers of
shells coat the ribbing. In places, not an inch of wood is visible.
Researchers say they won’t know for several years how much damage has been
done. But as the zebra mussels continue to spread, scientists fear that
underwater museums like this one could be lost forever.


For the Great Lakes Radio Consortium, I’m Brian Mann on Lake Champlain.

Radio Waves Zap Zebra Mussels

Researchers say low frequency radio waves may be a more effective way of controlling zebra mussels. The Great Lakes Radio Consortium’s Tom Scheck has the story:

Transcript

Researchers say low frequency radio waves may be a more effective way of controlling zebra mussels. The Great Lakes Radio Consortium’s Tom Scheck reports.

Zebra mussels have caused millions of dollars of damage to power plants, boats and intake pipes. They’ve also seriously hurt native species in the Great Lakes and other inland waterways. Purdue University chemistry professor Matthew Ryan says he may have found a way to control the zebra mussels without harming fish or other aquatic wildlife. In the laboratory, he says low frequency electromagnetic radio waves were found to cause the zebra mussels to lose critical minerals at a much faster rate than they can acquire them.


“It ultimately kills them. There’s a stress response after a day or so. They stop feeding and begin to close their shells and after about 19 days about 50 percent of the mussels in a given population will be dead.”


Ryan says native fish and clams were not harmed when exposed to the same technique. If it’s proven effective in the wild, he says electrical barriers could block mussels from infesting other lakes and streams. For the Great Lake Radio Consortium, I’m Tom Scheck in Saint Paul.