Tag: reproducing

Alewife Die-Off Sparks Worries for Salmon

  • Because alewives make up a large portion of salmon diets, alewife die-offs are causing concerns that salmon populations might also decline. (Photo courtesy of the Fish and Wildlife Service)

A small fish is dying off in parts of the Great Lakes. According to the U.S. Geological Survey, the amount of alewives in Lake Michigan dropped nearly 70 percent last year. And biologists say the decrease might signal trouble for the salmon fishery. The Great Lakes Radio Consortium’s Peter Payette reports:

Transcript

A small fish is dying off in parts of the Great Lakes. According to the U-S
Geological Survey, the amount of alewives in Lake Michigan dropped nearly 70
percent last year. And biologists say the decrease might signal trouble for
the salmon fishery. The Great Lakes Radio Consortium’s Peter Payette
Reports:


Lake Michigan’s alewife population has been lower than it is now a few times
in the last 20 years. But Lake Huron’s alewife population is practically zero.


That’s why salmon in Huron are small and many are coming over to Lake
Michigan to feed.


USGS Biologist Charles Madenjian says the problem is stocked salmon are now
reproducing naturally.


And the growing numbers of salmon are eating up all the alewives.


“People fear that if alewives stay at this low level, the salmon are more
prone to disease and you’ll get a die-off.”


Neither salmon nor alewives are native to the Great Lakes.


Alewives swam in from the Atlantic Ocean through the Welland Canal. Salmon were introduced in part to control the alewife population.


For the GLRC, I’m Peter Payette in Traverse City.

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Deer Devouring Wild Ginseng

  • As deer populations increase, the amount of vegetation they consume also increases. Included in their diet is the endangered wild ginseng. (Photo by Lester Graham)

Researchers say deer populations are threatening wild ginseng. They say the therapeutic herb could disappear from the American landscape within the next century. The Great Lakes Radio Consortium’s Shamane Mills has more:

Transcript

Researchers say deer populations are threatening wild ginseng.
They say the therapeutic herb could disappear from the American landscape
within the next century. The Great Lakes Radio Consortium’s Shamane
Mills has more:


Ginseng is a wild herb believed to boost energy and improve
concentration. The plant inhabits eastern deciduous forests from Maine to
Georgia.


James McGraw is a biologist at West Virginia University. He studied the
health of wild ginseng plants over the course of four years, and published his
findings in the journal Science. He found that increasing deer
populations threaten to eventually wipe out the plant.


“What we found was that populations were depressed because affects
of browsing. They weren’t reproducing; plants would begin to die and they
weren’t recruiting new plants into the population.”


McGraw says maintaining the wild herb is not only important for
ecological reasons. It’s also important to people who depend on it for
income; wild ginseng roots sell for hundreds of dollars a pound.


To control the deer population, McGraw suggests a change in hunting regulations or introducing more deer predators.


For the GLRC, I’m Shamane Mills.

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