Bacteria Engineered to Destroy Pollutants

  • Justin Gallivan and his team programmed a type of E. coli bacteria to seek out atrazine in a petri dish, and destroy it, but right now the bacteria is too weak to survive in the wild. (Photo courtesy of the National Institutes of Health)

Scientists have engineered bacteria to seek out and destroy a chemical that pollutes drinking water. Rebecca Williams has more:

Transcript

Scientists have engineered bacteria to seek out and destroy a chemical that pollutes drinking water. Rebecca Williams has more:

Atrazine is a pesticide used on corn, sorghum and sugar cane. It’s one of the most common chemicals polluting water supplies in the US.

Justin Gallivan is a chemist at Emory University. His team genetically engineered a type of E. coli bacteria. They programmed it to seek out atrazine in a petri dish… and destroy it.

He says right now, this engineered bacteria is too weak to survive in the wild.

“It requires quite a bit of care and feeding, as you might say, to survive even in a petri dish. So if it were placed in a more harsh environment, it is extremely likely that these types of organisms would not survive.”

He says using this kind of genetically engineered bacteria to clean up pollution is still a long way off.

For The Environment Report, I’m Rebecca Williams.

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‘Beefalo’ vs. Buffalo

  • Some American bison are contaminated with cow genes. The genes are left over from the early days of cross-breeding. (Photo by Paul Frederickson, Courtesy of Wikimedia Commons)

In iconic images of the Great Plains, you always see the land dotted with bison. Those bison helped make the prairies what they were. But the bison that you see on prairie preserves today are not exactly the same as the ones that once roamed the plains. The Environment Report’s Charity Nebbe has more:

Transcript

We have a handful of ranchers to thank for the fact that we have any bison today. At one point there were only about a thousand and now there are half a million. Bob Hamilton is the Director of the Tallgrass Prairie Preserve in Oklahoma. He says the ranchers who saved the bison also put them at risk.

“Part of their motivation was also to see if they could cross breed bison with domestic livestock to see if they could produce a hardier winter resistant ‘beefalo’.”

The beefalo were not hardy and the ranchers abandoned their project, but the cattle genes remain. Bob Hamilton’s herd consists of 2,700 bison. Thanks to genetic testing, Hamilton has been able to weed out all of the bison carrying the most damaging kind of cattle DNA. But, there is some genetic material he just can’t get rid of. Chances are, there will always be a little bit of beef in the buffalo.

For the Environment Report I’m Charity Nebbe.

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Ballast Tanks: Rinse and Repeat

  • Crew chief Mohammed Sangare tests the "Federal Kivalina"'s ballast tanks for invasive species. (Photo by David Sommerstein)

The United States and Canada are trying to
figure out how to keep new invasive species out of
the Great Lakes. 185 have already snuck in, costing
the region billions of dollars a year. Many
hitchhiked in the ballast tanks of foreign cargo ships.
Both countries want the public to know they’re doing
something about the problem. So they invited journalists
to the port of Montreal to see how ballast tanks are
tested for invasive species. David Sommerstein
reports:

Transcript

The United States and Canada are trying to
figure out how to keep new invasive species out of
the Great Lakes. 185 have already snuck in, costing
the region billions of dollars a year. Many
hitchhiked in the ballast tanks of foreign cargo ships.
Both countries want the public to know they’re doing
something about the problem. So they invited journalists
to the port of Montreal to see how ballast tanks are
tested for invasive species. David Sommerstein
reports:

A couple dozen reporters crowd the deck of the cargo ship Federal Kivalina.
Cameras click, pencils scribble, and tape rolls as a man in a bright orange
uniform steps forward to test for invasive species.

“My name is Mohammed Sanare.”

(sound of tape measure sliding down)

Sangare is the bosun, the crew chief. He slides what looks like a metal tape
measure down a tube. It’s the opening of one of the Kivalina’s 16 ballast
tanks.

“Down to the bottom now. The bob’s down to the bottom.”

The tape hits the tank bottom, and Sangare reels it back up.

Terry Jordan, a St. Lawrence Seaway official, is waiting with a handheld
gizmo. It’s a refractometer that tests water salinity. He carefully places a
drop of ballast water on it.

“All it takes is one drop of water on the refractive lens, OK.”

Jordan peers through the refractometer’s lens. It reads 38 parts salt per 1000
parts water.

Recent scientific studies show that concentration of salt water kills up to
99% of the organisms hidden in these ballast tanks. That’s important
because those critters can compete with native species and damage whole
ecosystems.

David Reid is a researcher with the National Oceanic and
Atmospheric Administration.

“Salinity was very effective at killing many of the organisms that we would
expect to be able to survive in the Great lakes.”

So for the first time this year, all ships voyaging into the Great Lakes have to
do something that sounds like a mouthwash ad.

“Swish and spit.”

Yeah, “swish and spit”. Terry Jordan says on its way across the ocean, the
ship flushes its ballast tanks with salt water, and presumably, kills potential
invasive species. The refractometer test is proof of the swish and spit. If the
ship fails, its ballast tank is sealed and its owner is fined up to 36,000
dollars.

“Swish & spit” has been voluntary for years. Environmentalists say the new
mandatory rules are a step in the right direction, but too little and way too
late.

“Some would argue that the dam has already burst.”

Hugh MacIsaac specializes in invasive species at the Great Lakes Institute
for Environmental Research in Windsor, Ontario. He says if ships were
“swishing and spitting” from the beginning, we might have been able to
prevent the zebra mussel, round goby, and other invasions.

But, MacIsaac warns there are other species lurking on the horizon, like
one in Germany, ominously called the killer shrimp.

“And so any protective measures that we put in place today that would
prevent or retard their ability to get in, I would welcome.”

Scientists doubt anything can be fool-proof. Invasive species still can hide
other places on the ship. And the new rules do nothing to stop salt-water
invaders like the mitten crab from attacking ports on the East and West
Coasts.

Terry Johnson is the St. Lawrence Seaway’s U.S. Administrator. He says
“swish & spit” is a huge step forward for the Great Lakes.

“So does that mean that it is absolutely, definately 100% positively assured that there
won’t be invasives coming in with these new regulations? No, it’s doesn’t.
But it dramatically reduces the risk.”

Congress is considering even tougher rules that would force shippers to
install cutting-edge ballast cleansing systems. The proposal could cost up to
a million dollars per vessel. The Bush Administration has threatened a veto.

For The Environment Report, I’m David Sommerstein.

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New Ship Has Balance Without Ballast

  • A diagram of the ballast-free ship (Photo courtesy of Professor Michael Parsons)

Cargo ships move sea life around the world.
Moving aquatic life from one port to another can cause
environmental havoc. Lester Graham reports there’s a
new idea that could nearly eliminate the problem of
transporting sea life to foreign ports:

Transcript

Cargo ships move sea life around the world.
Moving aquatic life from one port to another can cause
environmental havoc. Lester Graham reports there’s a
new idea that could nearly eliminate the problem of
transporting sea life to foreign ports:

There is an invasion of every major port on the globe.

“Today, the world’s shores are under attack. Armies of aliens are secretly invading our coasts.”

If this video, Invaders from the Sea, from the International Maritime
Organization sounds a little over-dramatic, it’s really not. Invaders from far-flung
corners of the world are brought in by commerce. In their travels, cargo ships pick up the
hitchhikers.

Those hitchhikers can be fish, mussels – aquatic bugs of all kinds. They can become
pests. Out-compete native species for food and space. They can destroy the
native ecosystems and often damage the economic well-being of people.

Here’s how it happens. Ocean-going cargo ships dock at a foreign port. They pump in
water for ballast to keep the ship stable. They also pump in some of the living things in
the water. When they arrive at the destination port, they can pump out that water and
the critters that were sucked up with it.

In the US, ports from Chesapeake Bay to San Francisco have been invaded. But,
the Great Lakes have been hit especially hard by invasive species.

Michael Parsons is a professor of naval architecture at the University of Michigan. He
says when foreign ships were able to come in from the Atlantic and travel as far as
inland as Duluth, Minnesota; they brought a lot of invaders with them.

“With the opening of the St. Lawrence Seaway in the ‘50’s, that led to increased
introduction of non-indigenous species such as the zebra mussel, and the round goby, and
the ruffe, and the various smaller creatures that have been brought in to the Great Lakes.”

Those creatures have damaged the ecosystem of the Great Lakes. And they’ve cost the economy.
By one Environmental Protection Agency estimate about five-billion dollars a year.

Parsons and his colleagues have been working to design a ship that has no need for
ballast. In the lab, a scale model has been tested in a long pool. Instead of pumping
water in and out of the ballasts, the water would flow through big
tubes that run the length of the ship.

“And so, that’ll create a slow flow through these trunks so that they’re always swept
clean of foreign water.”

“A ship like that is just what we need in the Great Lakes.”

Andy Buchsbaum runs the Great Lakes office of the environmental group, the National
Wildlife Federation.

“If you eliminate the need for ballast water altogether, then you’re eliminating the vast
majority of invasive species introductions that come in through the discharge of ballast.”

The ballast-free ship design is creating some excitement. Even the shipping industry is
paying attention because the ship also is more fuel efficient.

If someone decides to actually build the ballast-free cargo ship, it’ll be a while before
the first one is on the high seas.

Allegra Cangelosi has been working on the ballast and invasive species problem for
close to a decade. She’s a policy analyst with the Northeast-Midwest Institute.

“I think it’s a wonderful development. I don’t think there’s going to be any one answer
for all ships plying all waters throughout the globe. However, the more good answers
that are out there to choose from, the better for the environment.”

Some of those choices are filtering ballast water or killing organisms in the ballast with
chemicals. Those systems are expensive. And since fuel isn’t getting any cheaper, that
might make a more fuel-efficient ballast-free ship attractive.

For The Environment Report, this is Lester Graham.

Related Links

Big Ships Required to Flush

  • A ship discharging its ballast water (Photo courtesy of the US Geological Survey)

Ships should be bringing in fewer unwanted
pests into the Great Lakes. Both Canada and the
U-S are now requiring ships to flush out their
ballast water tanks before entering the lakes.
Tracy Samilton reports:

Transcript

Ships should be bringing in fewer unwanted pests into the Great
Lakes. Both Canada and the U.S. are now requiring ships to flush out their
ballast water tanks before entering the lakes. Tracy Samilton reports:

Ships need to take on ballast water to keep them stable. When they pump in
water from freshwater foreign ports, they also suck up pests.

Since 2006,
Canada has required ships to flush their tanks with salty ocean water
before entering the Great Lakes. The U.S. adopted the requirement at the
start of this year.

Collister Johnson is with the U.S. side of the St.
Lawrence Seaway, which connects the Atlantic Ocean to the Great
Lakes. He says the rule will eliminate almost 99% of freshwater
pests in ballast tanks.

“If they’re exposed to salt water, especially full strength sea water, they
are effectively killed.”

Samilton: “Why didn’t we do this before?”

Johnson: (laughs) “I don’t know.”

It won’t completely eliminate the problem because some aquatic pests can
still survive in the sediment in the bottom of ballast tanks.

For The Environment Report I’m Tracy Samilton.

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Airplane De-Icers Harm Aquatic Life

  • Fluids from de-icers and anti-icers can end up in creeks and lakes, harming the aquatic life that dwell there. (Photo courtesy of the EPA)

A new study indicates fluids used to remove or prevent ice buildup on planes can still be
harmful to aquatic life. But the research shows some of the chemicals are more toxic
than others. Chuck Quirmbach reports:

Transcript

A new study indicates fluids used to remove or prevent ice buildup on planes can still be
harmful to aquatic life. But the research shows some of the chemicals are more toxic
than others. Chuck Quirmbach reports:


The US Geological Survey has been testing the different fluids used as de-icers and anti-
icers on airplanes. The solutions often flow into storm sewers that end up in creeks and
lakes. Researcher Steve Corsi says when the products are used during extreme weather
conditions, they can build up in the environment:


“Intense freezing rains are usually the worst ones. Where you might see a little bit higher
concentration, there’s more risk.”


So the federal agency exposed minnows, algae and other sensitive aquatic organisms to
the de-icers and anti-icers. Corsi says de-icers are not as toxic as they used to be but anti-
icers that prevent ice buildup on airplanes are still toxic. The results of the tests are being
sent to the Environmental Protection Agency, which is considering restrictions on how
the fluids are used.


For the Environment Report, I’m Chuck Quirmbach.

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Ten Threats: The Earliest Invader

  • A bridge for a river... this portion of the Erie Canal crossed the Genesee River via an aqueduct in Rochester, NY. This photo was taken around 1914. (From the collection of the Rochester Public Library Local History Division)

The Ten Threats to the Great Lakes” is looking first at alien invasive species. There are more than 160 non-native species in the Great Lakes basin. If they do environmental or economic harm, they’re called invasive species. There are estimates that invasive species cost the region billions of dollars a year. Different species got here different ways. David Sommerstein tells us how some of the region’s earliest invaders got into the Lakes:

Transcript

We’re bringing you an extensive series on Ten Threats to the Great Lakes. The Great Lakes Radio Consortium’s Lester Graham is guiding us through the reports:


“The Ten Threats to the Great Lakes” is looking first at alien invasive species. There are more than 160 non-native species in the Great Lakes basin. If they do environmental or economic harm, they’re called invasive species. There are estimates that invasive species cost the region billions of dollars a year. Different species got here different ways. David Sommerstein tells us how some of the region’s earliest invaders got into the Lakes:


If the history of invasive species were a movie, it would open like this:


(Sound of banjo)


It’s 1825. Politicians have just ridden the first ship across the newly dug Erie Canal from Buffalo to New York.


(Sound of “The Erie Canal”)


“I’ve got an old mule, and her name is Sal. Fifteen miles on the Erie Canal…”


Chuck O’Neill is an invasive species expert with New York Sea Grant.


“At the canal’s formal opening, Governor DeWitt Clinton dumped a cask of Lake Erie water; he dumped that water into New York Harbor.”


Meanwhile, in Buffalo, a cask of Hudson River water was triumphantly poured into Lake Erie.


“In a movie, that would be the flashback with the impending doom-type music in the background.”


(Sound of ominous music)


It was an engineering and economic milestone, but a danger lurked. For the first time since glaciers carved the landscape twelve thousand years ago, water from the Hudson and water from the Great Lakes mixed.


(Sound of “Dragnet” theme)


Enter the villain: the sea lamprey. It’s a slimy, snake-like parasite in the Atlantic Ocean. It sucks the blood of host fish.


Within a decade after the Erie Canal and its network of feeders opened, the sea lamprey uses the waterways to swim into Lake Ontario. By the 1920’s and 30’s, it squirms into the upper Lakes, bypassing Niagara Falls through the Welland Canal.


What happens next is among the most notorious examples of damage done by an invasive species in the Great Lakes. By the 1950’s, the sea lamprey devastates Lake trout populations in Lake Superior. Mark Gaden is with the Great Lakes Fishery Commission.


“They changed a way of life in the Great Lakes basin, the lampreys. They preyed directly on fish, they drove commercial fisheries out of business, the communities in the areas that were built around the fisheries were impacted severely.”


The sea lamprey wasn’t the only invader that used the canals. Canal barges carried stowaway plants and animals in their hulls and ballast. In the mid-1800’s, the European faucet snail clogged water intakes across the region. The European pea clam, purple loosestrife, marsh foxtail, flowering rush – all used the canal system to enter the Great Lakes.


Chuck O’Neill says the spread of invasive species also tells the tale of human transportation.


“If you look at a map, you can pretty much say there was some kind of a right-of-way – railroad, canal, stageline – that was in those areas just by the vegetation patterns.”


Almost one hundred invasive species came to the Great Lakes this way before 1960. O’Neill says every new arrival had a cascading effect.


“Each time you add in to an ecosystem another organism that can out-compete the native organisms that evolved there, you’re gradually making that ecosystem more and more artificial, less and less stable, much more likely to be invaded by the next invader that comes along.”


(Sound of “Dragnet” theme)


The next one in the Great Lakes just might be the Asian Carp. It’s swimming up the Illinois River, headed toward Lake Michigan. Cameron Davis directs the Alliance for the Great Lakes.


“If this thing gets in, it can cause catastrophic damage to the Great Lakes, ‘cause it eats thirty, forty percent of its body weight in plankton every day, and plankton are the base of the food chain in the Great Lakes.”


The U.S. Army Corps of Engineers has installed an electric barrier in the Chicago Sanitary and Ship Canal that might stop the carp. But as long as the canals around the region remain open for shipping and recreation, it’s likely more invaders may hitch a ride or simply swim into the Great Lakes.


For the GLRC, I’m David Sommerstein.

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Debate Over Ballast Discharge Regs

A debate is developing over who has the authority to place
stricter rules on ocean freighters that bring cargo into the Great Lakes.
The ultimate goal is to keep these ships from discharging invasive species
when they dump ballast water into the lakes. But as the Great Lakes Radio
Consortium’s Tracy Samilton reports, experts say the debate is overlooking a
key issue:

Transcript

A debate is developing over who has the authority to place stricter rules on ocean freighters that can bring cargo into the Great Lakes. The ultimate goal is to keep ships from discharging invasive species when they dump ballast water into the Lakes. But as the Great Lakes Radio Consortium’s Tracy Samilton reports, experts say the debate is overlooking a key issue:


Some states want the EPA to be in charge of regulating ballast water discharges. Others want the Coast Guard to handle it. Whoever regulates the discharges, it won’t be enough, according to Allegra Cangelosi. She’s a policy analyst at the Northeast MidWest Institute.


“They can’t pump it all out with routine ballast pumps. So they often carry residual ballast into the Lakes which is teeming with organisms nonetheless.”


Cangelosi says freighters need to start treating their ballast water with technologies such as filtration and deoxygenation. She says the longer the government waits to require the treatment of ballast water, the more invasive species will make their way into the Great Lakes.


For the GLRC, I’m Tracy Samilton.

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Bill Aims to Slow Spread of New Invasives

  • A new bill aims to prevent new invasive species from entering our country. (Photo courtesy of USGS)

Many states are asking the federal government to take a new approach in fighting aquatic invasive species. The Great Lakes Radio Consortium’s Shawn Allee has more:

Transcript

Many states are asking the federal government to take a new approach in fighting aquatic invasive species. The Great Lakes Radio Consortium’s Shawn Allee has more.


Currently, federal agencies try to control invasive species after they start disrupting ecosystems in U.S. waterways.


But now the U.S. Senate is considering a measure that calls for testing species for potential harm before they’re allowed into the country. Allegra Cangelosi is with the Northeast Midwest Institute, a regional advocacy group.


“Believe it or not, the door’s been wide open. So anybody in any state, unless the state has a law, can make a decision to bring a new organism to our waters, cultivate it, let it get loose and do whatever.”


If passed, the law would put new restrictions on the pet industry. Federal agencies would decide whether it’s too risky to import a specific fish or other aquativ species. The act would also beef up inspections of ships that might carry invasive pests.


For the GLRC, I’m Shawn Allee.

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Teachers Criticized for Evolution Lessons

  • Some teachers are struggling with teaching evolution because some disagree on religious grounds. (Photo by Elliot Jordan)

Science teachers in high schools and middle schools are on the front lines of the culture wars. Conservative Christians and others are confronting them about teaching evolution in the classroom. At the same time, teachers are learning about the growing body of evidence that supports the theory of evolution. The Great Lakes Radio Consortium’s Julie Grant reports:

Transcript

Science teachers in high schools and middle schools are on the front lines of the culture wars. Conservative Christians and others are confronting them about teaching evolution in the classroom. At the same time, teachers are learning about the growing body of evidence that supports the theory of evolution. The Great Lakes Radio Consortium’s Julie Grant reports:


Some science teachers got a chance to attend a major science conference recently. Researchers from around the world were in Akron, Ohio to present findings and learn about advances in evolutionary biology. The conference was organized by people studying the dramatic transition whales made when they moved from the land to the water.


It’s only been a few years since Ohio even allowed the concept of evolution into the state’s high school academic standards. Those standards are the basis for the state graduation test that students must pass to get a diploma.


Even though it’s part of the state curriculum, many science teachers get the brunt of complaints from students and parents who oppose teaching evolutionary theory.


THOMAS: “I did have a student come to me and literally say, ‘I cannot sit in this classroom and listen to what you’re talking about.’ And I said, ‘Why not?’ And she said, ‘Well, I’m a Christian, I can’t listen to this.’ I said, ‘Well, I’m a Christian too, so where’s the problem?’”


GRABERT: “Well, I’ve had a number whose fathers are ministers come in and tell me how I need to teach the class, and I have to talk about creationism and I just share with them what we have to teach and how the curriculum is.”


STONE: “There’s a point when you just sort of have to tell the kids, This is what you need to know to pass the test to get out of high school. So, sit down, listen, learn the facts you need to know. I’m not saying you have to believe what I say, but this is what the state says you need to know to get out of high school.”


These are teachers from rural, suburban, and city school districts but they are all dealing with this issue. They try to stay up to date on new scientific evidence to defend their classroom lessons. That’s part of the reason they’re at this science conference.


(Sound of lecture)


This day’s activities are geared toward schoolteachers. The world’s top researchers on whale evolution are explaining their latest findings. Ann Sowd teaches honors biology at Hoover High School in North Canton, Ohio.


“It’s important to be at workshops like this so that you can, as a high school teacher, be really accurate with your teachings and understand what the evidence for evolution is and why it’s really- what we do know about how organisms change over time. Because the worst thing that can happen is you’re inaccurate and then someone comes with the opposing argument and you don’t know what you’re talking about.”


The teachers are hearing from scientists from all kinds of disciplines from anatomy, to functional morphology, to geo-chemistry. The scientists are showing how their discoveries and analyses fit together and provide a picture of the evolution of the whale as it moved from land back to the ocean.


But one leading researcher says the schoolteachers need more than just new scientific research to defend their lessons in the classroom. Howard University anatomist Daryl Domning says students who question evolutionary evidence are often looking for answers that lie beyond the realm of science. But Domning says teachers often respond with the latest research and recent fossil discoveries.


“And then they’re amazed that it doesn’t convince them. Because even though they’re raising questions about scientific evidence, they’re really not passionate about the scientific evidence. They’re passionate about ‘what is the meaning of my existence?’ and until you get down to that level and surface those concerns and show that hey, evolution doesn’t mean there’s no meaning to your existence, on the contrary, it can mean all these things, it means there’s more meaning then you thought there was maybe, only then is there a way of breaking through this pattern of talking past each other, which is what we’ve been doing for thirty years here.”


Domning says teachers can help students and parents understand that accepting the evidence of evolutionary theory doesn’t have to undermine religious faith.
He encourages teachers to tell students they can believe both at the same time, to point them to places where they can get more information, and to quickly get back to the science lesson.


For the GLRC, I’m Julie Grant.

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