bacteria - The Environment Report

Tracking Long-Term Zebra Mussel Changes

Zebra mussels have been colonizing North American lakes and rivers since 1991. Scientists have looked at many of the ways mussels affect those ecosystems. But a new study underway shows how those effects are moving up the food web…and are having two very different results. The Great Lakes Radio Consortium’s Mark Brodie reports:

Transcript

Between 50 and 5-hundred billion zebra mussels now live in New York’s Hudson River. That’s a lot of hungry mouths to feed on the river’s zooplankton and phytoplankton. The problem is the mussels are not the only ones that like to dine on the microscopic plants and animals. A new report suggests the mussels are stealing food from some of the river’s fish.

That’s forcing those fish to look elsewhere for their meals. Sandra Nierzwicki-Bauer is the director of the Darrin Freshwater Institute, and a biology professor at Rensselaer Polytechnic Institute in Troy, New York. She says the zebra mussels can dramatically alter an ecosystem.

“They’re very rapid filter feeders, and as such, they’re able to remove tremendous amounts of phytoplankton, algae, bacteria in the water column. As such, the phytoplankton serves as food sources for other organisms so you really are impacting the entire food web.”

Nierzwicki-Bauer says those impacts go all the way up to fish. David Strayer is a freshwater ecologist at the Institute of Ecosystem Studies, and a lead author of the report on the Hudson River. He says his team studied fish populations in the Hudson both before and since zebra mussels colonized there.

“In open water fish species, we saw a decline in abundance, we saw declines in growth rates, and we saw that the populations of those fish tended to shift downriver compared to the period before the zebra mussel invasion.”

That means some of the most common and popular fish in the Hudson are no longer where they used to be…among them American shad, herring, and white perch. That’s because the zebra mussels are eating those fish’s food…forcing the fish to go elsewhere.

But Strayer says while some fish have had to move away from the mussels…some species have welcomed their new neighbors.

“In the same period of time, we saw populations of fish that live in the weed beds…we saw those populations increase, we saw growth rates of those fish increase, and we saw the populations of those weed bed fish shift upriver into the area where the zebra mussels lived.”

These forage fish have more to eat because the plants at the river’s bottom are growing more. That’s because the zebra mussels clear up the water, which allows more sunlight to reach the plants. Strayer says the zebra mussels have changed almost everything about the Hudson’s ecology.

But he says some of those changes have been difficult to predict, and the changes may not apply to all bodies of water where the mussels have colonized. This is one of the first studies using long term data that looks at the zebra mussels’ affect on fish populations…but there is some evidence that other bodies of water are dealing with similar situations. There have been reports that zebra mussels may be affecting smelt and chub in Lake Michigan…these smaller fish are food for larger species, such as trout and salmon. But while the results are comparable, David Strayer says the changes in the Hudson River are more pronounced than changes elsewhere.

“This isn’t because we have more zebra mussels in the Hudson than in the other places, but it’s because there are differences in the structure of the ecosystem between the Hudson River and the Great Lakes and other places that have been invaded. So, you have to be a little cautious extrapolating from one body of water to the next.”

That sentiment is shared by Andy Kahnly. He’s a fishery scientist with the Hudson River fishery unit of the New York State Department of Environmental Conservation. He also worked on the new study. Kahnly warns for now, the results only apply to young fish…and not adults. That’s because fish can live up to 30 years, and the data don’t go that far back.

“Quite often, changes in early lifestages will take some time to translate into changes in fish populations and then to changes in fish communities. So it takes a lot of data, a lot of years of data to see a change.”

Kahnly says that means anglers in the Hudson might begin to notice some changes over the next few years… and he says the study did find a dramatic decrease in many of the species that people catch.

“If these changes in production of young persist into the future, then definitely there will be a decrease in the abundance of the adults which people are fishing for.”

But that depends on what you’re fishing for. The Institute of Ecosystem Studies’ David Strayer says your perspective might change depending on that you’re trying to catch.

“If you’re concerned about shad populations, if you’re a shad fisherman, then you might be concerned with the zebra mussel invasion and think it’s a bad thing. If you like the weed beds, if you’re a duck hunter or a large mouth bass fisherman this might be regarded as a positive thing.”

Strayer says the study shows zebra mussels are capable of having a tremendous impact on an ecosystem. He says it also shows the importance of being careful to prevent the introduction of invasive species…like zebra mussels…into an ecosystem.

For the Great Lakes Radio Consortium, I’m Mark Brodie.

Spraying to Slow Gypsy Moths’ Momentum

Gypsy moths from Wisconsin and Michigan are invading Illinois at a greater rate than in past years. New areas of northern Illinois are to be treated to stop the moth from further damaging trees… but native butterflies will also be killed by the spray. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

Gypsy moths from Wisconsin and Michigan are invading Illinois at a greater rate than past years. New areas of northern Illinois are to be treated to stop the moth from further damaging trees… but native butterflies will also be killed by the spray. The Great Lakes Radio Consortium’s Lester Graham reports:

Gypsy moths will eat the leaves of nearly any type of tree. This year, as they have for the past two decades, Illinois officials will be spraying a bacteria in selected parts of Chicago’s western suburbs. Any caterpillar that eats vegetation sprayed will be killed. Jim Cavanaugh is the Gypsy Moth Operations Coordinator for the state Department of Agriculture. He says the spraying won’t have any lasting damage on anything but the gypsy moth.

“The studies have shown that for naturally occurring or indigenous, if you will, butterflies and moths, that the following year their populations will make up the difference of any depression of the population in the spray year.”

Because of the timing and targeted spraying, the bacteria have a more lethal effect on the gypsy moth than other insects.

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

Walkerton Water Tragedy Revisited

The consequences of the tainted water tragedy in southern Ontario are still being assessed. Seven people died and more than two thousand were made sick nearly two years ago, when the bacteria E. coli was found in drinking water in Walkerton, Ontario. An inquiry into the tragedy lasted more than a year, and a preliminary report was released last month. It blamed the two men in charge of the public utilities commission in Walkerton. But it also pointed the finger at cuts made years before by the Ontario government. Environmentalists across the Great Lakes are concerned that unless the lessons of Walkerton are learned on both sides of the border, water supplies will again be placed at risk. The Great Lakes Radio Consortium’s Dan Karpenchuk reports:

Transcript

The consequences of the tainted water tragedy in southern Ontario are still being assessed. Seven people died and more than two thousand were made sick nearly two years ago when the bacteria, E. coli, was found in drinking water in Walkerton, Ontario. An inquiry into the tragedy lasted more than a year, and a preliminary report was released last month. It blamed the two men in charge of the public utilities commission in Walkerton. But it also pointed the finger at cuts made years before by the Ontario government. Environmentalists across the Great Lakes are concerned that unless the lessons of Walkerton are learned on both sides of the border, water supplies will again be placed at risk. The Great Lakes Radio Consortiums Dan Karpenchuk reports from Toronto:

Walkerton is a small community of five thousand people about 135 miles northwest of Toronto not far from Lake Huron. There’s some light industry, some tourism… but agriculture is the economic mainstay. The E. coli disaster put the town of Walkerton in the headlines, where it’s remained. Some still feel the effects of the tainted water through an assortment of medical symptoms and complications. Others won’t drink the water; no matter what assurances they’ve been given that it’s safe. Many, like Robert Cooney, remain bitter.

“People in this town are sick of the whole thing. Yes, they got compensation. But for the people that are on dialysis and the people that lost loved ones, we’re looking for something. Something went wrong.”

There was a lot that went wrong, according to the man who headed the inquiry into the tragedy. In January, Justice Dennis O’Connor released his report. He concluded that the brothers who ran the Public Utilities Commission contributed directly to the tragedy, first by failing to properly monitor the drinking water, then by trying to cover up the emerging catastrophe by actively misleading health officials, assuring them the water was safe.

But O’Connor also turned his criticism on the government of Ontario, saying cuts to the MOE, or Ministry of Environment, undermined its ability to deal with the problems in Walkerton.

“The provincial government’s budget reductions led to the discontinuation of government laboratory testing services for municipalities in 1996.”

Now six years later, those services still have not been reinstated.

“In implementing this decision, the government should have enacted a regulation mandating that testing laboratories immediately and directly notify the MOE and the medical officer of health of adverse results. Had the government done this, the boil water advisory would have been issued by May 19 at the latest, thereby preventing hundreds of illnesses.”

The Conservative government in Ontario reacted quickly to the allegations. Premier Mike Harris, who early on during the inquiry, maintained that his government’s policies were not to blame, now did an about face.

“I deeply regret any factors leading to the events of May 2000, that were the responsibility of the government of Ontario either prior to or during my tenure as premier.”

Harris went further in his attempts to limit the political damage. He said many of the recommendations made by Justice O’Connor would be implemented. They included continuous chlorine monitors for wells, increased inspections and better training for operators.

But many critics say they they’re not convinced. They say a week after the 700-page report was released, neither Harris nor any member of his cabinet, had read it.

Far from Walkerton, the political fallout is being felt most in Toronto, seat of the province’s legislature…. and home to many of Ontario’s environmental groups.

The Canadian Institute for Environmental Law and Policies says the problems in Walkerton have called attention to the broader issue of water quality in the region. Researchers say the amount of pollutants discharged into rivers and lakes more than doubled between 1995 and 1999. And over the same period the number of provincial water testing sites was cut by two thirds.

That could have serious implications for the province’s lakes and rivers…. and since those systems feed into the Great Lakes, the entire region is at risk.

Professor Louis Mallott was involved in the study….

“We concluded that Ontario is unable to assess the overall quality of Ontario’s inland waters that flow into the Great Lakes. And this is necessary to determine whether Ontario’s environmental policies are effective.”

Over the past year almost four hundred cases of bad water have turned up in Ontario. E. coli and other bacteria have plagued water systems in towns, trailer parks, schools, private homes and even a nudist colony. And that worries people like Paul Muldoon, the executive director of the Canadian Environmental Law Association. Muldoon says Ontario is also sending a clear message south of the border, and it’s not a positive one.

“I am convinced that if I was in the U.S. right now, I could at least legitimately raise the issue, saying lookit Canadians sure we cause stresses in the Great Lakes and there’s lots of issues here. But don’t talk to us until you get your act together and Walkerton is a glowing example, you do not have your act together. And since Walkerton there’s not a lot of evidence you’ve got your act together yet despite that wake up call, despite the depth of that tragedy.”

The Ontario government, however, insists the situation is improving.

But critics aren’t buying it. They say Ontario’s environmental problems have not only jeopardized the province, but could affect the entire Great Lakes region. They say there is a clear message to governments on both sides of the border…. that budget cuts and privatization could lead to more tragedies like Walkerton.

For the Great Lakes Radio Consortium, I’m Dan Karpenchuk.

Battery-Powering Bacteria

U.S. scientists have identified bacteria that can eat pollution and generate electricity at the same time. The Great Lakes Radio Consortium’s Lester Graham reports:

RECORD YEAR FOR BEACH CLOSINGS (Version 1)

Lake Michigan had a record number of beach closings this year. The Great Lakes Radio Consortium’s Jonathan Ahl has more:

Transcript

Lake Michigan had a record number of beach closings last year. The Great Lakes Radio Consortium’s Jonathan Ahl reports.

The Lake Michigan Federation is reporting almost six hundred beach closings on Lake Michigan in 2001. That’s up from just over four hundred last year. Federation director Cameron Davis says most of the closings are due to wastewater carrying bacteria to the lakes when treatment plants are at capacity. He says the solution is to cut back on development near the lakes:

“We need to try to limit the amount of pavement that’s being laid down all across the region, so that rainwater naturally filters through the ground rather than getting shuttled off into a sewage treatment plant.”

Davis says the number of beach closings on Lake Michigan should actually be higher than his report shows. He says Michigan does a poor job testing for bacteria near beaches, and says Wisconsin’s numbers are excluding Sheboygan County where there have been problems in the past. For the Great Lakes Radio Consortium, I’m Jonathan Ahl.

RECORD YEAR FOR BEACH CLOSINGS (Version 2)

Lake Michigan beaches were closed more often this summer than ever before. As the Great Lakes Radio Consortium’s Jonathan Ahl reports, beach closings can translate into significant economic loss:

Transcript

Lake Michigan beaches were closed more often this summer than ever before. The Great Lakes Radio Consortium’s Jonathan Ahl reports.

A report from the Lake Michigan Federation shows an all-time high of 600 beach closings in 2001. High levels of bacteria found in the water caused most of the closings. Federation director Cameron Davis says in addition to the environmental problems, the closings have an economic impact on the region:

“Take a look at a place like Chicago that gets 60 million visitors a year to the lakefront. And you get a beach closing Labor Day weekend or a fourth of July weekend. You’re looking at millions of people, some from around the world, that can’t visit the beaches here.”

Davis says the bacteria is getting into the water when heavy rains force wastewater and sewage carrying human and animal waste past treatment plants and into the lake. The Lake Michigan Federation is setting up a center to help citizens and community groups solve bacteria problems at beaches. For the Great Lakes Radio Consortium, I’m Jonathan Ahl.

Creating Electricity From Human Waste

With the planet’s population at 6 billion and growing, it’s
becoming more challenging to handle all the human waste. Now,
scientists may have a way to reduce that waste, while at the same time,
creating clean electricity. The Great Lakes Radio Consortium’s Wendy
Nelson reports:

Airport Thaws De-Icing Problem

Each winter, airports around the country use more than 30 million
gallons of deicing fluid. The gooey substance prevents ice and snow from
building on a plane’s wings. However, the fluid can also seep into the
ground and pollute groundwater. It’s a costly problem for airports. But
now, one has found a unique solution. The Great Lakes Radio
Consortium’s Karen Kelly reports:

Transcript

Each winter, airports around the country use more than 30 million gallons of deicing fluid. The

gooey substance prevents ice and snow from building up on a plane’s wings. However, the fluid can

also seep into the ground and pollute groundwater. It’s a costly problem for airports. But now, one

has found a unique solution. The Great Lakes Radio Consortium’s Karen Kelly reports:

(sound of plane)

It’s a cold, overcast day in Albany, New York as a passenger plane lifts off the runway. It’s one

of the hundred or so planes that take off from here every day. At this time of year, they’ll all

have to be deiced. Steve Lachetta is the Albany airport’s planner and environmental manager.

“We’re in the Hudson River basin and our winter season extends for over 214 days, from early

October through late April or early May. Albany, being a typical small hub, uses 100 thousand

gallons of PG per year.”

PG is propylene glycol, the main ingredient in deicing fluid that makes it gooey. Any time the

temperature dips below 40 degrees, airports are required by the FCC to use PG. The problem is,

propylene glycol also seeps into the ground.

And in Albany’s case, it started showing up in the nearby Mohawk River – a local source for

drinking water. So, Albany became the first airport in the country to receive a state mandate to

clean up its deicing fluid.

“We were spending one million dollars to dispose of our winter storm water after collection. So we

tried every form of recycling the fluid, trucking it off airport. And we took a common sense

approach to cost control and became very interested in establishing biological treatment.”

In other words, Lachetta turned to microorganisms for help. He added bacteria to the dirty storm

water. And found they started digesting the propylene glycol. The bacteria broke it down into

acidic acid and then carbon dioxide and methane. The process gives the microorganisms fuel to grow.

“The manufacturers refer to propylene glycol as the filling of the Oreo cookie of the microbe world

and very readily digested so we did much experimentation and found total removal. Byproducts are 85

percent pure methane and 15 percent carbon dioxide.”

(sound inside treatment plant)

That pure methane is put to use here – providing heat for the airport’s storm water treatment

plant. It looks like something out of Willie Wonka and the Chocolate Factory. The room is filled

with a jumble of brightly colored pipes. There’s deep purple, vibrant green and canary yellow. Each

one has a special purpose.

“The large blue pipes are cycling 22 gallons per minute through the large vessels outside standing

35 feet high, 14 feet wide, and the brown pipes are the dirty storm water directly off the aircraft

aprons and the light blue pipes are for the clean water.”

Those pipes run to and from a pair of giant mixing vats. They stir up a brew of dirty storm water,

microorganisms, and some extra nutrients. It’s all cooked at a temperature of 85 degrees. And the

result is clean water.

Shelly Zuskin-Barish is the project manager for the EPA’s Airport Deicing Operations Study. She

says Albany has the most stringent treatment program in the country.

“I was very impressed when reviewing their treatment system. We found they were getting very good

removal in terms of not only propylene glycol but also an additive called tolyltriazole.”

Zuskin-Barish says there’s growing concern about tolytriazole because of its impact on aquatic

life. This is the first system she’s seen that removes it. As for propylene glycol, most airports

use a combination of recycling it and trucking it off site. Albany’s system removes more of the

pollutants, and it’s cheaper. Zuskin-Barish says Albany is on the cutting edge because it had to

be.

Albany airport has a local limit through their own state of 1 part per million propylene glycol.

For the different airports we’ve seen, that’s a very tight limit and I think in large part, pushed

them to go to this technology, which is helping them achieve those levels on a daily basis.

But now, other states – and countries – are starting to crack down as well. And Albany’s Steve

Iachetta is getting lots of visitors.

“We’ve been visited by Tokyo International, some European airports, the Department of Defense, much

larger airports, Denver, Nashville, other hubs that have come to see our early pioneering efforts.

It’s great to be on the leading edge. It’s nice to know we can contribute to improving the

environment.”

Right now, airport pollution controls differ from state to state. But next winter, the EPA will

consider national regulations to govern the disposal of deicing fluid. That may bring even more

visitors to Albany – to find out how a small airport ended up with the country’s most innovative

system.

For the Great Lakes Radio Consortium, I’m Karen Kelly in Albany, New York.

E-Coli Found on Beaches

Scientific discoveries sometimes raise more questions than they
answer. That’s been the case since scientists found e-coli bacteria in
the sand of some Great Lakes beaches. The Great Lakes Radio
Consortium’s Wendy Nelson reports:

New Threats to Indoor Air Quality

Consumers are becoming more aware of indoor air quality problems that can be
caused by emissions from materials like particle board, paint and carpeting.
But a new report identifies more threats. The study found that household
appliances like dishwashers, washing machines and shower heads can release
chemicals from the water into the air…and add to the air pollution inside
your home. The Great Lakes Radio Consortium’s Wendy Nelson reports: