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GLIN==> SEMINAR (Ann Arbor)



NOAA GREAT LAKES SEMINAR SERIES
(Co-sponsored by the NOAA Great Lakes Environmental Research Laboratory
(GLERL), the University of Michigan Cooperative Institute for Limnology
and Ecosystems Research (CILER), and the Great Lakes Sea Grant
Network).

SEMINAR ANNOUNCEMENT

Title:        Effects of omnivory in marine planktonic food webs

Speaker: Robert Ptacnik
                Visiting PhD student
                Institute for Marine Research
                Kiel, Germany

Date:       Tuesday, September 24, 2002 Time: 10:30 a.m.

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

Abstract: Omnivory in marine calanoid copepods was manipulated by the
presence/absence of microzooplankton in model food webs. The presence of
microzooplankton caused changes in abundances of various phytoplankton
groups, and enhanced reproduction in calanoid copepods. Further experiments
on calanoid copepods with diatoms and heterotrophic dinoflagellates as prey
revealed that positive effects of microzooplankton on copepod reproduction
cannot be attributed to differences in the copepod's feeding efficiency.
Rather, microzooplankton caused 'trophic upgrading' of the phytoplankton
prey for calanoid copepods. Recent findings about negative effects of pure
diatom diets on reproduction in calanoid copepods may be relativized by
these results, since diatom blooms are usually accompanied by high
abundances of heterotrophic dinoflagellates.

Contact: Dr. Radka Pichlova (CILER/GLERL)
Phone 734-741-2269
E-mail: Radka.Pichlova@noaa.gov




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