Virgin Shark Birth Sets Researchers in Motion

  • 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.

Ijc Hears Concerns Over Task Force Report

An international group that monitors the health of the Great Lakes is working on a report that they hope will help policymakers manage the waters in the basin. The Great Lakes Radio Consortium’s Annie MacDowell reports on a public hearing that took place in Chicago:

Transcript

An international group that monitors the health of the Great Lakes is working on a report that
they hope will help policymakers manage the waters in the basin. The Great Lakes Radio
Consortium’s Annie MacDowell reports on a public hearing that took place in Chicago:


Concerned groups responded to a report that came out two weeks ago by the International Water
Uses Review Task Force. The International Joint Commission appointed the task force to
provide an update on developments that have taken place in the basin since the Commission’s
2000 report.


Noah Hall is from the National Wildlife Federation’s Great Lakes Office. He says he’s
concerned the task force’s report does not emphasize how serious threats to the Great Lakes have
become.


“The report could mislead the public or interested policy makers and lull policy makers into
complacency in terms of the need and the urgency for basin-wide protection for the Great Lakes,
particularly for ground water.”


Hall said ground water depletion is causing problems in the communities around the Great Lakes
Basin. Other criticisms of the report were its failure to look toward the future on issues like
climate change and water diversion. The U. S. Chairman of the IJC says the Commission will
study all the public’s comments at a retreat and write their official report within two to three
months.


For the Great Lakes Radio Consortium, I’m Annie MacDowell.

Poultry Farmers Look to Cogeneration Plant

People who live next to poultry farms often complain about the smell, and environmental groups often complain about the pollution. Now farmers are looking for solutions. The Great Lakes Radio Consortium’s Michael Leland reports that one group of farmers wants to convert farm animal waste into energy:

This story was researched and written by Corie Wright.

Transcript

People who live next to poultry farms often complain about the smell. And
environmental groups often complain about the pollution. Now farmers are looking
for solutions. The Great Lakes Radio Consortium’s Michael Leland reports that
one group of farmers wants to convert farm animal waste into energy:

The group is calling itself West Michigan Co-Gen. Co-Gen stands for co-
generation – a process that takes one form of fuel and converts it into two forms
of energy. In this case, farmers are looking into building a plant that would
convert poultry manure into electricity and steam. Chuck Pistis is with
Michigan State University’s Agricultural Extension. He says not only could the
plant reduce odors, it could also reduce pollution from poultry waste.


“This plant would result in reducing
the volume of this waste by 70%, so you’d be able to
generate steam and
electricity and then the 30% of the waste that’s remaining would be further processed
by fertilizer manufacturers.”


Pistis says Co-Gen must perform a feasibility study to see if it would be cost-
effective and practical. If the plant becomes a reality it could be the first co-
generation facility in the region to use poultry manure as fuel.


For the Great Lakes Radio Consortium, I’m Michael Leland.

State Pushes Fish Grocers to Warn Consumers

A state government is taking some grocery chains to court to try to force them to post warnings about mercury in fish. The Great Lakes Radio Consortium’s Lester Graham explains:

Transcript

A state government is taking some grocery chains to court to try to force them to post warnings
about mercury in fish. The Great Lakes Radio Consortium’s Lester Graham explains:


Just about any fish has trace amounts of methyl-mercury in it due to pollution. But some predator
fish, such as swordfish, shark, and some tuna have higher levels of mercury. The State of
California is taking five grocery chains that sell fish to court. It wants Kroger’s, Safeway, Trader
Joe’s, Albertson’s and Whole Foods to warn consumers that higher levels of mercury can cause
cancer, birth defects and reproductive harm. Tom Dressler is with the California Attorney
General’s office.


“I mean, one example would be to post a warning at the fish counters where the products are sold.
We’re not asking for warning labels on the packages. We just want a clear, reasonable warning
posted that informs consumers and does some good.”


The case is important because California often leads the nation in setting new standards for
environmental law.


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

Nation Failing in Radon Remediation?

A coalition of scientists is reporting that efforts to reduce radon levels in homes throughout the U.S. are largely failing. The Great Lakes Radio Consortium’s Celeste Headlee has more:

Transcript

A coalition of scientists is reporting that efforts to reduce radon levels in homes throughout the
U.S. are largely failing. The Great Lakes Radio Consortium’s Celeste Headlee has more:


Radon is a natural gas that emits low levels of radiation. Research has proven it can cause lung
cancer. Officials estimate 15 thousand lung cancer deaths can be traced back to radon each year
in the U.S. Congress passed the Indoor Radon Abatement Act in 1988, setting a national goal to
reduce radon in American homes to safe levels.


Peter Hendrick is the Executive Director of the American Association of Radon Scientists and
Technologists. He says the country’s radon program is ineffective, with dangerous levels of the
gas still present in ten million homes in the U.S.


“I believe that the reason behind that is because one particular agency, Housing and Urban
Development, has really not lived up to its responsibilities under the National Environmental
Protection Act to comply with EPA standards on radon.”


Hendrick is calling for the government to enforce existing laws and even create tax incentives for
compliance. Federal officials have not yet commented on Hendrick’s complaints.


For the Great Lakes Radio Consortium, I’m Celeste Headlee.

Dairy Farmer Gives Cows a Winter Break

Most dairy farmers around the Great Lakes region milk their cows all year long. It brings in a steady paycheck and ensures a steady flow of milk to manufacturing plants. Now a small but growing number of farmers give their cows a break during the coldest months. It’s a technique called seasonal dairying. Its supporters say it’s gentler on the cows, it’s easier on the environment, and it gives small dairy farms a future in an industry that’s growing ever bigger. The Great Lakes Radio Consortium’s David Sommerstein reports:

Transcript

Most dairy farmers around the Great Lakes region milk their cows all year long. It brings in a steady
paycheck and ensures a steady flow of milk to manufacturing plants. Now a small but growing
number of farmers give their cows a break during the coldest months. It’s a technique called seasonal
dairying. Its supporters say it’s gentler on the cows. It’s easier on the environment. And it gives
small dairy farms a future in an industry that’s growing ever bigger. The Great Lakes Radio
Consortium’s David Sommerstein reports:


It’s a chilly winter day in the northern New York town of Denmark. Kevin Sullivan strides into
the barn where his 60 cows munch quietly on their day’s feed.


“In the winter we’re pretty much conventional farmers.”


On conventional farms, cows stay in the barn all year long. The farmer trucks hay and grain into
the barn to feed them. But Sullivan is a grazier. His cows munch on pasture grasses from April
to October. And when they’re inside for winter, he “dries the cows off” for a couple months.
That means they don’t give milk until they start calving in the spring. Sullivan says he first read
an article about what’s called “seasonal dairying” ten years ago.


“I started thinking about it then and I kinda ran it past my wife and she laughed at me and said
‘y’know it’ll never work.'”


The problem with the seasonal system is dairy farmers are used to relying on their monthly milk
check to pay bills. No milk, no check. That took some getting used to.


“The first year was kind of scary ’cause you don’t really have any income for a couple months in
the wintertime but after we made it through that first year, I knew it was going to work pretty
good.”


The reason it works is outside.


Sullivan zips up his jacket and walks out to the barnyard. Unlike most farms, there’s not much
mud, just acres of thick green grass peeking through a dusting of snow.


“Once you get a sod built up like this, you can bring out your cows, I mean, the cows could be out
here today and they’re not going to hurt this pasture at all.”


Grazing is the key to seasonal dairying. You time when your cows give birth to calves and
produce their best milk to coincide with spring and early summer. That’s when pastures grow
the most nutritious grass. Sullivan says it’s a cow’s natural cycle.


“Cows were made to eat grass. A lot of people forgot about that, I guess. I would say the two biggest things that
harm a cow is grain and concrete and a lot of guys push grain and the cows are on concrete all
the while but by kicking the cows outside and letting them be on the sod and letting them eat the
grass, you can get rid of about 90% of your cow problems.”


In the pasture, they’re less susceptible to foot diseases than cows in a muddy barnyard. And
because grazing cows roam many acres, their manure is spread naturally and fertilizes the land.
A grazing farm typically has less erosion, uses fewer pesticides, and is less polluting to nearby
creeks than a conventional farm, where cows are confined to a small area and the farmer has to
dispose of tons of manure.

The method is easier on the animals and the land. And often easier on the farmer’s wallet too. A
study by the American Farmland Trust finds seasonal dairying can be an economically viable
alternative to conventional farming, especially for small farms like Kevin Sullivan’s. But only one or two percent of farms in the U.S. are seasonal. Brian Petrucci directs the American Farmland
Trust’s farm division.


“At some point in the last twenty years, it was decided that the only way to farm in this country was to get big or
get out.”


Under the tutelage of Ag school extensions, farm herds have swelled from the hundreds to the
tens of thousands. State and federal environmental agencies have had to create new regulations to
contain all the waste the farms generate. At the same time, thousands of small farms have gone
out of business.


Petrucci says seasonal dairying can help reverse the trend. But it’s slow to catch on in part
because the agriculture industry – the companies that supply the farmers – often doesn’t benefit.


“Dairy graziers and others who are operating on a smaller scale are not the consumers of feed
stuffs and farm supplies and farm equipment that the larger farmers are.”


There’s another reason, says Pete Barney of the Cornell Cooperative Extension in St. Lawrence
County, New York. It’s rooted in dairy history in this country.


“Milk plants, milk companies wanted a year-round, constant supply of milk, so now farmers bred
animals so they were coming in periodically throughout the whole year so they could keep a constant
flow of milk going.”


A different system can work on a large scale. Brian Petrucci says in some countries all dairy
farms are seasonal and grazing operations.


Back on the Sullivan farm, Kevin Sullivan says seasonal dairying is also good for his family. The
two months off from milking means more time for his kids, even a vacation, a rare thing among
dairy farmers.


“Farming is, you know, daily grind. Most people get locked into it and they don’t realize that there is
something besides going to the barn and doing chores every day. It’s really kind of opened up
our life a little bit to enjoy our hobbies in the wintertime at least.”


Sullivan’s business is good. He’s invested in an ice cream factory with some neighbors. He says
thanks to grazing and seasonal dairying, his fields are clean and green, his cows are healthy, and
his farm is thriving when so many other small farms are up for sale.


For the Great Lakes Radio Consortium, I’m David Sommerstein.

Nature Viewed Through Prism of Religion

  • Tom Rakow, right, points out to Kent Rydberg the patch of forest with the tree stand he'll be using. Rakow is the founder and president of the Christian Deer Hunters Association. Rydberg is the membership director. (MPR Photo/Jeff Horwich).

Conservation means different things to different people. Your interests or your profession might color your view. For example, a hunter, an environmental activist, or a farmer might each define conservation dramatically differently. But other aspects of our lives also affect our views about nature. The Great Lakes Radio Consortium’s Jeff Horwich says for some people, the idea of conservation is closely connected with their idea of spirituality:

Transcript

Conservation means different things to different people. Your interests or your profession might
color your view. For example, a hunter, an environmental activist, or a farmer might each define
conservation dramatically differently. But, other aspects of our lives also affect our views about
nature. The Great Lakes Radio Consortium’s Jeff Horwich says for some people the idea of
conservation is closely connected with their idea of spirituality:


At one time whole families, whole villages used to live or die by the hunt. So for some hunters, it
seems fitting that before they go out to kill something the afternoons start with a prayer.


“Lord help us to hunt in such a way that it is pleasing to you. . .We recognize you’re
here.. .We just put it in your hands, in
Christ’s name, Amen.”


It’s a cloudy, windy day in the countryside west of Hutchinson, Minnesota. Tom Rakow and
Kent Rydberg stand side-by-side with their bows, president and membership director of the
Christian Deer Hunters Association. The group is based at Rakow’s home in Silver Lake, but
claims hundreds of dues-paying members around the country.


Rakow grew up in Wisconsin, and came to deer hunting long before he came to God.


“Unfortunately I poached my first deer while I was squirrel hunting at age 11, and things just kinda
went downhill from there. Deer hunting was my God.”


A teenage Rakow was carrying an archery permit when he shot his first deer with a .22, an illegal
kill. So, to make it look legal, he stuck an arrow in its side and got away with it.


Rakow went through a religious conversion at 21. He became a born-again Christian. He says he
realized deer hunting was his own false idol. He says either he had to find a way to harmonize
God and deer hunting or the hunting had to go.


“That’s buck manure. And here’s another scrape there.”


We’re moving over a plowed field, into tall grass on our way to tree stands in the forest.
Needless to say, the Reverend Rakow is now at peace with his two passions. He ministers to 80
people in his independent church each Sunday, and spends up to 30 days in the woods each fall.


Rakow’s theology of hunting balances two messages from the Bible. First is the chance to
appreciate God’s natural splendor. Rakow marvels at pheasants, mice, and of course, deer.


“Ultimately God created that deer. What did I have to do with that? You know, he fed that deer in the wild,
caused the antlers to grow, I didn’t have any part of that.”


But the Bible’s second message is the mandate to hunt. Rakow cites Psalm 8.


“There is a hierarchy. Humans, you, I, we have been made in the image of God. We have a
divine responsibility. We should be stewards over creation and part of that is hunting as a management
tool.”


Using the Bible as a hunting guide leads to some distinctive viewpoints. The Christian Deer
Hunter on trespassing:


“If we love our neighbor as ourself, we’re not going to be going somewhere where they don’t want us to
be.”


On authority:


“So as far as you can see, the Bible and the DNR are pretty well in sync with one another?”


“Well, I don’t know if I want to go that far. But Romans:13, Paul writing to the believers in Rome, he
says that powers that be have been ordained of God and we are to submit to those powers.”


And on the plague of chronic wasting disease ravaging deer in his home region of Wisconsin:


“Being from that area, I mean, I know that there are a lot of people that to them deer hunting ranked up there
where it once did for me, where it was more important than God.”


Rakow wouldn’t necessarily call chronic wasting disease a punishment brought by God. But he
does see it as a result of violating the good stewardship rules laid out in the Bible.


And the perspective of the Christian deer hunter raises new questions that have not yet captured
the public imagination.


“I’m completing a book, that one of the chapters is Would Jesus Shoot Bambi?”


The answer is complicated, but it boils down to this: Bambi is not a real deer and yes, Jesus
would.


For an hour we sit in dead silence, 20 feet apart and 15 feet off the ground in tree stands. Then,
behind us, some rustling. Rakow tenses, his bowstring drawn back to his shoulder.


Rakow’s trailing string winds off into the brush.


“I think I just basically trimmed some hairs off his back. When I find my arrow that’s usually not
the best sign.”


But for the Christian Deer Hunter, it’s all right. The membership director, Kent Rydberg, didn’t get
one either. But God talks to him all the time on the deer stand, and that’s something.


“When God’s all around you, it’s sort of hard to put him out of the way. So there’s been some
really good thinking times.”


Of course it’s always better to fill your permit. But these guys have decided it’s not just deer
they’re hunting for out here.


For the Great Lakes Radio Consortium, I’m Jeff Horwich.

Study Finds Deer Reduce Forest Diversity

A soon-to-be-published study concludes that deer overpopulation is having a devastating, long-term impact on forests. The study will come out next month in the journal Ecological Applications. The Great Lakes Radio Consortium’s Cindi Deutschman-Ruiz reports:

Transcript

A soon-to-be-published study concludes that deer overpopulation is having a
devastating, long-term impact on forests. The study will come out next month in the
journal Ecological Applications. The Great Lakes Radio Consortium’s Cindi Deutschman-Ruiz reports:


The U.S. Forest Service study was conducted in Pennsylvania’s
Allegheny National Forest. It examined deer densities
ranging from 10 deer to 64 deer per square mile.
As deer increased, tree species declined.


Red maple, sugar maple, white ash, yellow poplar, and
cucumber trees were all adversely affected, and native yew has been practically eradicated in the forest.


Steve Horsley is the study’s co-author. He says the next step is to determine
whether the impact of deer on forests is as great in areas where there
are also housing developments and
farmland.


“Deer tend, for example, when agriculture is in the mix, to
spend their time eating alfalfa and corn,
which have more digestible energy than most of the
plants that you find in the woods.”


Horsely says in the meantime, deer populations must come down,
preferably to less than 20 per square mile. In the Allegheny National Forest, that would mean cutting the
population in half.


For the Great Lakes Radio Consortium, I’m Cindi Deutschman-Ruiz.

Study Outlines Threats to the Lakes

A four-year study on the health of the Great Lakes is halfway finished. So far, the biggest threat is private and commercial development along the region’s shorelines. The Great Lakes Radio Consortium’s Mike Simonson has more:

Transcript

A four-year study on the health of the Great Lakes is halfway finished. So far, the biggest threat
is private and commercial development along the region’s shorelines. The Great Lakes Radio
Consortium’s Mike Simonson has more:


This 6-million dollar study funded by the U.S. Environmental Protection Agency directs scientists
to find out what the greatest threats are to the five Great Lakes. Researcher Gerald Niemi says
Lakes Michigan and Erie are the hardest hit by contaminants from heavily industrialized areas
and areas with agricultural development.


Niemi says the biggest red flag for all of the Great Lakes is continuing development of
shoreland.


“They’re under quite a bit of pressure from
both residential and urban-type development, commercial development. We found that in many situations
when you remove the forests, for example, and remove the wetlands, then you have impacts and reduced
populations of birds, amphibians, etc.”


Niemi says the best solution is to put aside some shoreland as parkland and natural areas.


For the Great Lakes Radio Consortium, I’m Mike Simonson.

Popular Herbicide Breeds Resistance

Some weeds are developing a resistance to one of the most popular crop herbicides. The Great Lakes Radio Consortium’s Shawn Johnson reports:

Transcript

Some weeds are developing a resistance to one of the most popular crop herbicides. The
Great Lakes Radio Consortium’s Shawn Johnson reports:


Farmers like the Monsanto Company herbicide “Roundup” because it kills a wide variety of weeds
without harming crops genetically engineered to resist it. But in the past few years, crop
scientists say Roundup’s popularity has created some problems. Through survival of the fittest, a
very small number of weeds that were always resistant to Roundup have reproduced, and in some
areas now flourish. Mark van Gessel is a weed specialist at the University of Delaware. He says
it’s a situation some farmers are stuck with:


“I really don’t have a lot of hope that we are going to be able to reverse this trend. We just have to learn to live with it.”


van Gessel says that means farmers will need to get away from exclusive use of Roundup and
other less common herbicides that contain its active ingredient. So far, weeds resistant to
Roundup have popped up in Delaware, Maryland, and California as well as in Tennessee, Ohio,
and Indiana.


For the Great Lakes Radio Consortium, I’m Shawn Johnson.