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GLIN==> SEMINAR OCT 14 - ANN ARBOR



Title:
NOAA GREAT LAKES SEMINAR SERIES
http://www.glerl.noaa.gov/news/seminars/

Date:
Tuesday, October 14, 2003

Time:
10:30 a.m.

Title:
"Newly Discovered and Corroborated Deleterious Effects of Zebra Mussels on Lake Ecosystems"

Speaker:
Dr. David F. Raikow
Ecologist


Where:
GLERL Main Conference Room
2205 Commonwealth Blvd.
Ann Arbor, MI 48105
For directions:

    http://www.glerl.noaa.gov/facil/triptik.html

Abstract
Although the invasion of zebra mussels (Dreissena polymorpha) is now nearly twenty years old and has been studied extensively, serious deleterious effects continue to be uncovered.  A series of experiments and observational studies was conducted throughout the lower peninsula of Michigan to ascertain the effects of zebra mussels on inland lakes, a set of ecosystems invaded relatively recently. These studies included a state-wide survey of phytoplankton communities across a Total Phosphorus (TP) gradient and large scale 50,000-L mesocosm experiments in Gull Lake. Other mesocosm experiments at the pond facility of the Kellogg Biological Station, Michigan State University, demonstrated Dreissena impacts on larval fish growth rates through food web interactions. Surveyed lakes with Dreissena were found to have lower concentrations of Dissolved Organic Carbon (DOC), which could render lakes more susceptible to the ill-effects of UV-B radiation. Lakes with Dreissena were also found to have less total phytoplankton biomass. Surprisingly, there was a positive relationship between Dreissena presence and dominance of the noxious cyanobacterium Microcystis aeruginosa in low nutrient lakes. Mesocosm experimentation on Dreissena and Microcystis displayed effect reversals between years, illustrating complex interactions between consumers, prey, and nutrient levels. Among the conclusions of this work is the possibility that monitoring and abatement of nutrient inputs to lakes may not be sufficient to predict and control cyanobacterial dominance of Dreissena-invaded lakes.


For more information, contact:
Dr. David Reid
734-764-2019

david.reid@noaa.gov


-- 
David F. Reid, Ph.D.
U.S. Department of Commerce
National Oceanic and Atmospheric Administration
Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.
Ann Arbor, MI  48105-2945
Voice:	734-741-2019
FAX:	743-741-2055
GLERL home page:
   http://www.glerl.noaa.gov