The common practice of throwing the little ones back could be harming future fish populations. The Great Lakes Radio Consortium’s Christina Shockley reports:
Transcript
The common practice of throwing the little ones back could be harming future fish populations. The Great Lakes Radio Consortium’s Christina Shockley reports:
Anglers and commercial fisheries are often only allowed to take fish that are larger than a certain size. So the smaller fish are left to reproduce. And researchers say that means their offspring will also be smaller, and not as healthy.
David Conover is a marine scientist at Stony Brook University. He says the larger fish are vital to the overall health of their species.
“The eggs that these big, old females produce tend to be of higher quality. The egg diameters may be a little larger, the yolk that is supplied to the eggs seems to be more rich, the larvae hatch at a larger size, they have a higher survival.”
Conover says fish populations can be harmed in as little as three or four generations. And it can take much longer for a population to rebound – if it can at all.
He says possible solutions could include different rules that protect larger fish, and new limits on where fish can be harvested.
These are "zooks." They're a form of currency used by the Zook Society, a group that barters for homemade products. (Photo by Stephanie Hemphill)
The Zook Society members trade each other for food and other items from their gardens and homes. (Photo by Stephanie Hemphill)
Some jars of food being offered, including peaches and grape syrup. (Photo by Stephanie Hemphill)
People in search of homemade foods are finding an old-fashioned way to get them: bartering. Gardeners and cooks who have a special pasta sauce are trading with others who make homemade applesauce. The Great Lakes Radio Consortium’s Stephanie Hemphill recently attended a barter gathering and brings us this audio postcard:
Transcript
People in search of homemade foods are finding an old-fashioned
way to get them: bartering. Gardeners and cooks who have a special pasta
sauce are trading with others who make homemade applesauce. The Great
Lakes Radio Consortium’s Stephanie Hemphill recently attended
a barter gathering and brings us this audio postcard:
“Hi, it’s nice to see you again.”
“Have mostly baked goods today.”
“Maple syrup, grape syrup, eggs.”
“Apple butter, squash soup, and frozen split pea soup. Um hm.”
“Worm juice! What the heck is worm juice?”
Buckley: “My name is Jenifer Buckley, and I’m one of the people who got the Zook Society together. This is an informal bartering group of people who home-process and garden.”
“We have lefse! We went down to the farm this part weekend, and Mary learned from her mom, so it’s totally homemade. And we would like two zooks for each bag.”
Buckley: “We decided on the zook as a unit of currency, because everybody agreed the Zucchini is easy to find. We wanted to make sure, for example if I have sauerkraut and somebody else has eggs and somebody else has jam, that we could all three of us barter for those things, so we decided on the zook as currency.”
“This is the three-generation salsa, my grandma’s salsa recipe. My grandma just died this summer. I made some with her last summer, but this summer I made it myself.”
“We have a pint of applesauce from this year’s crop, a good year for apples, and I guess this is about a three-zook item, does that sound fair?”
Buckley: “What often happens is that people are asking relatively little for their products, so people will say, ‘That’s not enough, you should ask for more for that!’ Because in general, I think people tend to undervalue what they do; a lot of time goes into baking and processing and so forth.”
Rhodes: “My name is Gina Temple Rhodes, and this time I brought some new things that I had never brought before. I brought Hinkelsteins, which are cookies made from oat flour, dates, So that was pretty popular. It’s a little strange – you bring things and hope they’ll sell because if they don’t you feel a little disappointed and have to take it home.”
Buckley: “It’s about bringing trade and economics down to the community level; it’s about trying new products. So in that respect there’s little bit of incubator going on here.”
“Try Paula’s? They’re a zook apiece.”
“Dave, are we supposed to eat these or plant these?”
Susie: “I’m Susie, and I brought worm juice, from our worm compost bin. It’s full of nutrients and you can use it to boost your house plants or in your garden. And I see nobody’s snapped it up yet, so I may have to go out and do promotion.”
Dawson: “I’m Katie Neff Dawson. We came away with some canned peaches – I’m kind of a peach freak so we got those. Cooper was into the peanut butter things, they look like Bit-O-Honey things, they’re really good. I think we all got lip balm because that was a good deal – lip balm for one zook. It’s a real diversity, and you come away with a wonderful meal, and it’s just a good community, good people getting together.”
“Bye, all! Thanks for the good food!”
HOST TAG: “Bartering home-made goods in Duluth, Minnesota. Stephanie
Hemphill produced that report for the GLRC.”
With its ability to breathe out of water and wriggle its way over land during dry spells, the media has dubbed the northern snakehead "Frankenfish." Its appearance in Lake Michigan is scary to scientists. (Photo courtesy of USGS)
A few weeks ago, a Chicago fisherman caused a stir when he found a northern snakehead fish. The discovery set off a frantic search to find out if yet another invasive species is threatening the Great Lakes. The Great Lakes Radio Consortium’s Jenny Lawton has this report:
Transcript
A few weeks ago, a Chicago fisherman caused a stir when he found a northern snakehead fish. The find set off a frantic search to find out if yet another invasive species is threatening the Great Lakes. The Great Lakes Radio Consortium’s Jenny Lawton has this report:
Just before Halloween, the so-called Frankenfish reared its ugly head… filled with sharp teeth… in Chicago’s Burnham Harbor on Lake Michigan. And it’s still a mystery as to just how it got there.
Although the snakehead is arare item in some Asian cuisines, there’s a more common suspicion amongst local experts and hobbyists. That snakehead was probably a pet that outgrew its tank, and instead of the traditional farewell down the toilet, it was set free in Lake Michigan. Free to eat through the Lake’s food web.
Local pet store manager Edwin Cerna says that’s why he stopped selling the fish years before they were banned by U.S. Fish and Wildlife. He remembers one day, when he was adjusting a tank, he accidentally got in between a snakehead’s lunch and its mouth.
“He bit me in the hand… made me bleed. It hurts. It’s got a nice strong jaw and that’s why it’s so dangerous because it can kill big fish, literally cut them in half. It’s almost like a big old killer whale, like a miniature version of it.”
But why on earth would anybody buy a vicious fish that can grow up to three feet long in the first place? Jim Robinett is with the Shedd Aquarium in Chicago. He says he’s a fish geek.
“I gotta say, as a little fish, when you first buy them, they’re really attractive; they’re neat little animals, but they eat like crazy. They’re voracious.”
Robinett knows not to be fooled by the little guys because what happens next is the perfect plot for a B-horror movie. He says the snakehead fish grows quickly, eventually eating everything in its tank. If it doesn’t die from overgrowing that tank, its owner might be tempted to dump it into a nearby body of water where it will keep eating its way up the food chain. Robinett says that’s the fear in Lake Michigan.
“They could potentially start picking off small salmon and lake trout, which is native to these waters here, they’re not real discriminating, they’ve been known to take things as large as frogs, some small birds, even small mammals that happen to get in the way there close to shore. They’ll eat anything they get their mouth on.”
Most hobby fish don’t last long in Chicago’s cold water. But the northern snakehead is different. The snakehead is native to northern Asia, and the Lake Michigan Federation’s Cameron Davis says that makes the fish feel right at home around here.
“It’s a lot like us Midwesterners, it just kind of hunkers down and… that’s part of the problem with the snakehead is that it can live under very extreme conditions. Which means it’ll out compete those other fish, and that’s a tremendous problem.”
Snakeheads have another edge on other species. The fish guard their eggs, giving their young a better chance of reaching maturity. But perhaps the most peculiar thing about snakeheads is that they can breathe. In addition to its gills, they have an organ that works like a lung and allows it to breathe air. It’s able to live up to three days as it uses its fins to wriggle across land in search of another body of water.
But looking down into the murky waters at Burnham Harbor, Davis says we shouldn’t run screaming yet. It’s not exactly a horror film scenario.
“I don’t think that the snakehead is going to come and grab our children out of schools and eat them or anything like that. But it is a problem for those of us who like to fish for yellow perch and whitefish and some of the things that make the Great Lakes so fantatstic, could really be threatened by this fish getting into Lake Michigan.”
Other invasive species cause an estimated 137-billion dollars of losses and damages in U.S. waterways each year. Cameron Davis says simply banning the local sale of fish like snakeheads hasn’t been enough to keep the Great Lakes safe.
“We’ve got to stop imports of these kinds of fish into the United States. We can’t protect the Great Lakes unless we’re checking these things at the door when they come into the country. It’s that simple.”
Davis is pushing for the passage of the National Aquatic Invasive Species Act. The bill would allocate a total of 174-million dollars to develop new technology for identifying and eliminating the invaders if and when they arrive.
So far, local authorities ahven’t found another snakehead near the banks of Lake Michigan, but Cameron Davis says the initial find just proves how hard it is to regulate what comes into the country’s largest body of fresh water.
Standing on the dock at Burnham Harbor, Davis looks out over the dark waters and shakes his head.
“It’s just an indicator that we’re in a race against time right now. Let’s hope that if there are more than one out there, that they haven’t hooked up.”
If they have, he says, it could truly be the stuff horror movies are made of… at least, for the other fish in the Great Lakes.
For the Great Lakes Radio Consortium, I’m Jenny Lawton in Chicago.
Ed Herrmann tries to hear some frogs through the
traffic near the Rouge River. (Photo by Ed Herrmann)
The middle branch of the Rouge River in suburban Wayne
County, Michigan. (Photo by Ed Herrmann)
Each Spring, thousands of people spend their evenings listening to frogs and toads. It’s not just for fun. They’re helping assess the water quality of rivers and wetlands around the country. The Great Lakes Radio Consortium’s Ed Herrmann joined the search for amphibians, and has this essay:
Transcript
Each Spring, thousands of people spend their evenings listening to frogs and toads. It’s
not just for fun. They’re helping assess the water quality of rivers and wetlands around
the country. The Great Lakes Radio Consortium’s Ed Herrmann joined the search for
amphibians, and has this essay:
I’ve always enjoyed being outside and listening to nature. Recording nature sounds is a
hobby of mine. So when I saw an ad asking for people to listen for frogs and toads, I
thought, “All right. Beats watching campaign commercials.”
I called up Friends of the Rouge…(that’s a local group dedicated to helping out the Rouge
River watershed) and a few days later I got a package in the mail. It was full of maps and
information, and had a CD with the songs of the local frogs and toads. I studied my area,
and found some good looking wet spots where I thought they might live.
I memorized the sound of the Wood Frog (sound), Chorus Frog (sound), Spring Peeper
(sound), and American Toad. Then, on the first night when the temperature and wind
conditions were just right, I headed out to hear some frogs.
(sound of traffic roaring by)
I don’t know what I was thinking. This is suburban Detroit, not exactly a wildlife refuge.
In fact, the only animal I see is a rabbit dodging traffic. And the only thing I hear is…
(more traffic sound)
The Rouge River flows into the Detroit River and then Lake Erie. It used to be one of the
dirtiest rivers around, mainly from all the industry down by the mouth. That problem is
more or less under control but now there’s a larger one.
If you look at a map from the 1970s, you see miles of wetlands, small farms and
orchards. Today you see nonstop subdivisions and shopping malls. It might seem like
progress to you, but for the river, the constant barrage of fertilizers, pesticides, soap and
other chemicals that everybody uses to keep their suburbs looking pretty is a lot worse
than an occasional dose of battery acid from a factory. Also having acres of concrete
instead of wetlands means there’s nothing to soak up and filter the water, which means
after a big rain, it floods. It’s obvious this river needs some help.
(sound of river)
In 1998, volunteers began surveying the frogs and toads in the Rouge watershed. These
creatures were chosen because they sing, so they’re easy to track. The reason they’re
good indicators is that, like other amphibians, they absorb water through their skin. That
means they get poisoned by everything that we in the civilized world pour into the water.
Plus, their eggs hatch in water and their larvae (the tadpoles) live in water. It’s pretty
simple: if the water is good, there’s plenty of frogs and toads. If not, they disappear.
So, night after night, I’m out there listening. Listening in the dark. Listening hard.
Not a peep.
I’m beginning to think that the price of all these well-manicured lawns is a silent spring.
Then finally one night, (sound of American toads) the good old American toad! All
right, it is the most common species around, but at least it’s a start.
(sound of chorus frogs and green frogs)
A few weeks later, I join a group at a “mitigated” wetland. That means that when a
developer decided that a real wetland would be the perfect place to build condos and a
golf course, the government said, “Sure, go ahead. Drain it. Just be sure to dig a hole
over here and fill it with water.” Now, five years later, some frogs have moved in and
seem to be fine.
But they still have a little problem…
(jet roars overhead, followed by a few green frogs)
Ah, location, location. This new wetland is right
next to the airport.
Now, the reason these frogs sing is to attract a mate. So if nobody hears them, there are
not going to be any tadpoles to make next year’s frogs. In order to survive, they need not
only to sing, but to be heard.
For the Great Lakes Radio Consortium, I’m Ed Herrmann.
This year, cicadas are re-emerging in many parts of the eastern United States. While not really locusts, they are considered a plague by some people. The Great Lakes Radio Consortium’s Jim Blum goes beyond the backyard to find out there is little to fear:
Transcript
This year, cicadas are re-emerging in many parts of the eastern United States.
While not really locusts, they are considered a plague by some people. The
Great Lakes Radio Consortium’s Jim Blum goes beyond the backyard to find out
there is little to fear:
(sound of cicadas)
Reporter Jim Blum: “I’m Jim Blum with naturalist Dan Best. Seventeen years ago this
month, Magicicada septemdecula and other species of periodic cicadas rose out
of the ground to lay eggs. Then, and now, and likely 17 years from now,
communities will expect a disaster. Dan, is it?”
Naturalist Dan Best: “No, I wouldn’t call it a disaster. Tremendous
natural phenomenon, yes, but disaster, no. Anytime you have large, big buzzy insects
around, people tend to get shook up, whether it’s bumblebees or dragonflies, but
especially when something shows up in prodigious numbers like these cicadas.”
JB: “Now, unlike a large outbreak of gypsy moths, the periodic cicadas don’t
actually eat the leaves.”
DB: “No, that’s right. The damage we are likely to see is the result of
female cicadas laying eggs.”
JB: “How?”
DB: “Well, they have a structure called an ovipositor, and in the end of a
twig they will use this like a little saw to make slits in the twig where they
will lay their eggs inside of that.”
JB: “How will that be apparent to us?”
DB: “Well, the twig will split as a result of several of these little egg laying
gouges in the twig, and from that point the twig may die, or the end of the
branch. And so you’ll notice withered brown leaves at the tips of branches.”
JB: “And that’s what they recognize as ‘flagging?'”
DB: “That’s the term.”
JB: “Now, what size trees are going to be affected?”
DB: “Branches or twigs that are half-inch in diameter or smaller. So on
big, mature trees that’s just the outer growth, no big deal. The trees
that are more vulnerable are the young trees, where literally all the
branches are that size.”
JB: “If this is not a disaster, what is it?”
DB: “I think it’s a tremendous natural phenomenon to experience. It only
occurs like a comet or a blue moon, and perhaps even less frequently than that.
You don’t want to miss it.”
(guitar music)
JB: “Now what’s a good time to see this emergence?”
DB: “Evening, just after dark. You’ll see the holes before the actual
emergence. And then, as they emerge, they’ll be coming up and you’ll see
them all over small trees. The edge of the woods is a good place to see
it.”
JB: “From the pictures I’ve seen, and from what I remember from 17 years ago,
the periodic cicada, bumblebee sized, black, orange eyes and wings. Do
they look like this when they come out of the ground?”
DB: “No, they don’t. What comes out of the ground are the nymphs, the
golden brown color, and no wings at all. Then they make their way up a tree
trunk or out on a branch, and this exoskeleton that they have splits open and
out emerges the adult which is a creamy white color with red eyes and a
couple of big black patches on it.”
JB: “Dan, are these cicadas going to be everywhere?”
DB: “Well, they are not going to be popping out of every square foot of ground in
the area, but there will be kind of a spotty emergence. But very heavy in
some places.”
JB: “If the visual spectacle of the emergence for some reason, doesn’t happen in my yard,
will I have missed out on the experience?”
DB: “No, because it’s almost impossible to escape what comes next.”
(sound up of cicadas)
DB: “The sound is an overwhelming, even annoying, series of buzzes and ticks.”
JB: “How do they make this noise?”
DB: “This loud noise is created by the males to attract the females. The
males vibrate two drum-like membranes to create the sound, which is then
resonated or amplified by a hollow chamber in their body.”
JB: “Not unlike the sound box of a guitar.”
DB: “That’s right.”
(strumming on guitar)
JB: “How long will we hear them?”
DB: “We’ll here this noise during the month of June and be over by about the
Fourth of July.”
JB: “About the same time that the annual or dog days cicadas show up.”
DB: “That’s right, that we’ll here during the hot days of July and August.”
JB: “Now why are those called annual cicadas?”
DB: “Well, unlike the 17-year cicada, which emerges from a single brood in
our area, we have several broods of these annual cicadas which have a much
shorter cycle in the ground. So every year, one way or the other, we have
annual cicadas.”
JB: “Why 17?”
DB: “Jim, I can’t tell you, I don’t know, it’s just one of those great mysteries
of nature.”
JB: “That’s naturalist Dan Best, and I’m Jim Blum, for the Great Lakes Radio
Consortium.”
A mallard duck hen sitting on her eggs in a strip mall tree planter in Ann Arbor, Michigan. Ducks Unlimited researchers have found that recent declines in duck populations are partly due to a lack of corridors between grasslands where ducks nest and wetlands where they thrive. (Photo by Rebecca Williams)
When this mallard hen's ducklings hatch, they'll have to cross a parking lot and busy intersections to get to water. (Photo by Arthur
Cooper)
Another view from the nest. (Photo by Rebecca Williams)
Researchers with the hunters’ conservation group Ducks Unlimited are reporting they’ve found some of the reasons the duck reproduction rate is falling in the Great Lakes region. The Great Lakes Radio Consortium’s Lester Graham reports:
Transcript
Researchers with the hunters’ conservation group Ducks Unlimited are reporting they’ve
found some of the reasons the duck reproduction rate is falling. The Great Lakes Radio
Consortium’s Lester Graham reports:
(sound of birds, a duck quacking and a truck door slamming)
YERKES: “Load in.”
Two years ago, we went out in the field with biologist Tina Yerkes and other Ducks
Unlimited researchers.
YERKES: “Every day these guys go out and they track the birds and that’s basically how
we figure out what they’re doing. ”
(sound of newly hatched ducklings peeping with hen hissing)
At the time, they were tracking mallard hens, watching them nest, and watching them as
they moved their ducklings from the nests in the grass to nearby wetlands and lakes.
After three years of study, they found some of the reasons duck reproduction rates are
down. We recently had a chance to sit down and talk with Tina Yerkes about the study.
She says, surprisingly, they found that egg production and nesting are good, despite nests
being destroyed by mowers and predators eating the eggs.
TY: “The problem is duckling survival. We have very poor duckling survival in this
area. And, that leads us to believe that we need to alter habitat programs to actually start
doing more wetlands work.”
LG: “So, what’s happening is the ducks are able to nest, they’re able to hatch out the
ducklings, but then when they move from the grasslands where the nesting is to the
wetlands where the ducks feed, they grow, they’re not surviving. What’s killing them?”
TY: “What we’re seeing is that hens, once they hatch their young, they move right after
the first day into the first wetland and it’s a dangerous journey. Basically, because our
habitat is so fragmented that they’re moving these ducklings through non-grassed areas,
across parking lots, roads. It’s dangerous. And, a lot of the ducklings either die from
exhaustion or predators kill them on the way. A lot of avian predators get them at that
point.”
LG: “So, we’re talking about hawks and not so much domestic animals like cats and
dogs.”
TY: “Ah, cats are a problem, yeah. It’s hard to document exactly what is getting them,
but feral cats and domestic cats are a problem. Hawks and jays, sometimes…”
LG: “Blue jays?”
TY: “Blue jays can be mean, yeah. But, it’s interesting to note that if you put those
corridors back between nesting sites and wetlands, it’ll be a much safer journey for
them.”
LG: “So, what are you proposing?”
TY: “I would look more away from urban areas where those infrastructures are already
intact. We would not certainly expect anybody to tear that type of stuff up. But, outside
the cities and urban areas there are lots of opportunities to look at areas where there is
grass existing or wetlands existing and then piece the habitat back together where we
can.”
LG: “There are places, for instance in Chicago, where they’re working to do exactly that.
Do you see that kind of effort in most of the states you studied?”
TY: “Yes, actually we do. Some states like – Chicago’s a very good example. A very
strong park system not only throughout the city, but out in the suburbs as well and we do
see that in a lot of different places. That’s a positive thing.”
LG: “Where are the worst places for duckling survival?”
TY: “The worst duckling survival was the site that you were at two years ago in Port
Clinton, Ohio. And, if you think about what that habitat looks like, what you have is a
few patches of grass and an area that’s heavily agriculturally based, but all the wetlands
have been ditched and drained so that when a bird has to move from an area where it
nested to get to a nice, safe wetland habitat, they have to make a substantial move across
a lot of open fields that don’t have a lot of cover on them. So, here you’re looking at
maybe piecing cover back between the wetland areas and still being able to maintain farm
operations at the same time.”
LG: “What can farmers do to help duck survival?”
TY: “Oh, let’s see. Leave some patches of grass along the fields, especially if they have
wetlands in their fields. Leave a nice margin around the wetland, a nice vegetative
margin around the wetland because the ducks will nest right in that edge as well. Then
they don’t have to move very far to take the ducklings to a nice food source and a nice
wetland.”
LG: “Now, this is not just about making sure that mallard ducks reproduce. What’s this
going to mean for the ecosystem as a whole?”
TY: “Every time we replace a wetland or replace grass on the landscape, we’re
improving the water quality because those types of habitats remove nutrients and
sedimentation from runoff. So, there’s all kinds of benefits. There are benefits to any
other species that depends on grasslands to nest in or wetlands to either nest in or even
for migratory birds. So there’s just a suite of benefits beyond ducks.”
Tina Yerkes is a biologist with Ducks Unlimited. She says the group will be working
with states to develop programs to encourage development of corridors between the
grasslands where the ducks nest and the wetlands where they thrive.
For the Great Lakes Radio Consortium, I’m Lester Graham.
Walleye (image courtesy of the Great Lakes Fishery Commission)
Conservation officials say there need to be new restrictions on walleye fishing. Lake Erie is a world-class destination for walleye fishing. But officials say without better conservation, it won’t be in the future. The Great Lakes Radio Consortium’s Aileo Weinmann reports:
Transcript
Conservation officials say there need to be new restrictions on walleye
fishing. Lake Erie is a world-class destination for walleye fishing. But
officials say without better conservation, it won’t be in the future. The
Great Lakes Radio Consortium’s Aileo Weinmann reports:
The Canadian province of Ontario and the states around Lake Erie plan to cut
this year’s walleye harvest by 30 percent. Conservation officials say
lowering the catch of the popular sport fish is necessary because the
walleye population is down.
Jim Barta runs charter fishing trips for walleye. He says rough weather in
recent years has damaged a lot of the fish nests of the walleye.
“Cold weather, storms in the Spring, about the time the walleye
are depositing their eggs on the sandbars and in the various reefs where
they spawn — you lose a lot of these nests, a good many of these nests.”
Even with the reduction in the number of walleye fished from the lakes,
conservation officials say the walleye population will still go down during
the next two years. They hope the plan begins to help walleye bounce
back after that.
For the Great Lakes Radio Consortium, this is Aileo Weinmann.
Almost 6300 Americans contracted the West Nile virus this year. And 133 of them died. Each season, health officials scramble to predict where the virus will strike before it affects humans. The Great Lakes Radio Consortium’s Karen Kelly reports on a experimental approach being used in Canada that might make that information faster and easier to collect:
Transcript
Almost 63 hundred Americans contracted the West Nile virus this year. And one
hundred 33 of
them died. Each season, health officials scramble to predict where the virus will
strike before it
affects humans. The Great Lakes Radio Consortium’s Karen Kelly reports on a
experimental
approach being used in Canada that might make that information faster and easier to
collect:
(sound of chickens)
Stephen Burgess stands in front of a chicken coop. He holds an egg carton in one
hand while
slowly lifting the coop’s plywood cover. He carefully collects a dozen eggs that
have rolled into a
trough at the back of the cage.
From here, he’ll visit thirty more sites around Ottawa, Canada’s capital.
Collecting eggs from
small farmers as well as test flocks set up around the city. It’s a new form of a
common early
warning system that’s used for the West Nile virus – the sentinel chicken flock.
But in this case,
it’s the eggs that are tested, not the chickens.
“Many states in the United States are using chickens but they are taking blood
samples from the
chickens every one to two weeks. The approach that we’re doing is we’re able to
monitor for
West Nile virus by looking for specific proteins in the eggs.”
Burgess says this offers researchers some distinct advantages. Blood sampling
requires the use of
trained technicians – one to hold the bird while the other draws blood. This causes
stress to the
chicken. And it poses a danger to the humans who are handling the blood samples.
Two people have been infected with West Nile virus while collecting chicken blood.
Burgess
says the nice thing about eggs is that they pose no risk to humans, and they’re easy
to get.
“If you want to go and look at a particular county, you can say, go out and collect
every egg from
every backyard flock this week and you can have a flash snapshot of what is the
status throughout
the county and that was totally unfeasible using previous approaches.”
Burgess is leading a pilot project to test out this approach in the Ottawa region.
He’s a biochemist
by training and runs a company with Hugh Fackrell, a microbiologist at the
University of
Windsor. The two had been working in the lab, trying identify antibodies in animal
blood. This
spring, they stumbled upon a method that they say reveals the complete immune
profile of a
chicken by examining its egg.
For now, they’re keeping that method a secret – until it’s patented. But it was
enough to convince
Ontario’s Ministry of Health to fast track a pilot project for this fall.
Dave Jensen is a spokesman with the ministry.
“We’re interested in testing out this approach because it offers both a less
invasive way of getting
test results and a way of getting more of them than doing it the way we have been.”
The project has also attracted the attention of researchers at the U.S. Centers for
Disease Control.
Jennifer Brown is a scientist at the CDC’s West Nile headquarters in Fort Collins,
Colorado.
“This is very new work and it’s very interesting. We’re really looking forward to
hearing the
results of this pilot study, but I think it’s too early to say how useful it’s going
to be in future West
Nile surveillance efforts.”
For instance, Brown says it might require a redesign of the sentinel chicken cages
that are
typically used.
“If you had an egg that was positive for West Nile antibodies, you would want to
know which
chicken it came from and you would want to know how many chickens in the flock were
laying
eggs that contained West Nile antibody.”
At this point, the pilot project is not that specific. Researchers are looking for
evidence of West
Nile in each flock, rather than the individual birds.
But Stephen Burgess, the pilot project’s director, is taking the idea into account.
He plans to
deliver a final report on the project in December. He’ll consider what worked, and
what needs
improving. And he hopes to demonstrate that testing eggs can provide a safer, and
less expensive
alternative for tracking the West Nile virus.
For the Great Lakes Radio Consortium, I’m Karen Kelly.
One of the largest egg farms in the nation is being ordered to shut down. The reason… a decade of complaints, including nine contempt citations for environmental violations. The Great Lakes Radio Consortium’s Bill Cohen reports:
Transcript
One of the largest egg farms in the nation is being ordered to shut down. The reason… a
decade of complaints, including nine contempt citations for environmental violations.
The Great Lakes Radio Consortium’s Bill Cohen reports:
The Buckeye Egg Farm churns out more than two and a half billion eggs a year… but
Ohio agricultural officials have ordered the factory farm to close. Neighbors of the farm
continue to complain about swarms of flies and bad smells… and environmentalists
continue to complain about manure being dumped into streams. In the words of Ohio’s
agriculture director….it’s “intolerable.”
Environmental activists such as Jack Shaner are glad about the shutdown order.
“We’re happy the state of Ohio has wised up to the fact that just like violent crime, when
it comes to environmental crime, some repeat violators just can’t be rehabilitated.”
Buckeye Egg warns of job losses injuring the economy…..and it promises an appeal of
the shutdown order. Company officials say a better approach is to sell the farm to new
owners.
For the Great Lakes Radio Consortium, I’m Bill Cohen.
Biologists are looking at how a shark
in a Great Lakes region aquarium gave
"virgin birth" last year. Photo courtesy of
Belle Isle Aquarium, Detroit.
A female shark in an aquarium in the Great Lakes region has apparently given virgin birth. Four shark eggs hatched last year and three of those babies are now growing normally. As the Great Lakes Radio Consortium’s Celeste Headlee reports, it may be some time before the cause can be determined, but the event is still a surprise for biologists:
Transcript
A female shark in an aquarium in the Great Lakes region has apparently given virgin birth. Four
shark eggs hatched last year and three of those babies are now growing normally. As the Great
Lakes Radio Consortium’s Celeste Headlee reports, it may be some time before the cause can be
determined, but the event is still a surprise for biologists:
Biologists have a technical term for virgin birth. It’s called parthenogenesis. Doug Sweet is the
Curator of Fishes at the Belle Isle Aquarium in Detroit. He says parthenogenesis is common in
invertebrates and some amphibians.
“Most vertebrate animals, the females will produce eggs even if the male is not around. And it’s
just a matter of… it’s a chemical trick, basically, to get that egg to develop into an individual
without a sperm activating it.”
But parthenogenesis has been totally unheard of for sharks, until now. Last year, the Henry
Doorly Zoo in Omaha, Nebraska, announced they thought a Bonnethead shark there had
reproduced by parthenogenesis. The baby lived less than 12 hours, though, and genetic tests were
inconclusive.
But when Doug Sweet saw the press release from the Henry Doorly Zoo about a possible virgin
birth, he thought he’d try an experiment. Sweet decided to incubate the eggs of his two female
bamboo sharks. Four of the eggs developed. Sweet says the sharks were acquired by the
aquarium before they had reached sexual maturity, and they have never been exposed to a male.
He says the likely conclusion is that these sharks are reproducing by parthenogenesis.
Two other explanations, though highly unlikely, are that the shark has both testicular and ovarian
tissue, and fertilized its own eggs or that sharks are capable of storing sperm for years and even
passing it down to their offspring. Sweet has sent small clippings from the sharks’ fins to the
Henry Doorly Genetics Lab. Testing has already begun, but Sweet says it could take more than a
year to get the results. In the meantime, Sweet says the facts remain the same: a female shark
has given virgin birth. If it is parthenogenesis, he says, it will have important implications for
biologists around the world.
“Parthenogenesis just hasn’t been considered to happen in sharks; it’s never been recorded. It may
be happening all the time out there, so this is kind of breaking news in the shark world.”
The two adult bamboo sharks and the offspring are currently on exhibit at the Belle Isle
Aquarium in Detroit.
For the Great Lakes Radio Consortium, I’m Celeste Headlee.
