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GLIN==> Seminar - Ann Arbor



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NOAA GREAT LAKES SEMINAR SERIES
SEMINAR ANNOUNCEMENT

WHEN:
THURSDAY, APRIL 18, 2002

TIME:
10:30 A.M.

TITLE:
"BENTHIFICATION OF FRESHWATER LAKE ECOSYSTEMS - MYTH OR REALITY?"

SPEAKER:
Dr. Edward L. Mills 
Director, Cornell Biological Field Station.

WHERE:
GLERL Main Conference Room
2205 Commonwealth Blvd.
Ann Arbor, MI  48105
Directions:  http://www.glerl.noaa.gov/facil/triptik.html

ABSTRACT:
Restoration of native fish and invertebrate species through improved water
quality has been a principal management goal in freshwater lake ecosystems
over the last 20 years. Consequently, many North American lakes have
experienced improved water quality through nutrient reductions leading to a
process known as oligotrophication (in contrast to eutrophication).
Reductions in free-floating algae concentrations have resulted in increased
water clarity and have released shallow water habitats from light
limitation. Increased water quality has been associated with both the
expected effect of increased native species community diversity and biomass
and the unexpected effect of making these habitats more vulnerable to
invasion by non-native species. Proliferation of non-native and
filter-feeding Dreissena sp., for example, has further enhanced water
clarity and increased light penetration. The combined effects of nutrient
abatement, grazing by dreissenids, and increased water clarity act
synergistically to redirect energy production from the pelagic to the
benthos in lake ecosystems. One might consider this ecological process in
freshwater lakes as benthification. Evidence for benthication will be
discussed and its utility for understanding and quantifying current changes
in freshwater lakes will be assessed. 

CONTACT: Dr. Rochelle Sturtevant, NOAA/GLERL, 734-741-2287


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