R/P-28

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Plankton trophic dynamics in Chesapeake Bay: Top down vs. bottom up control of copepod populations

Principal Investigator:

Jennifer E. Purcell

Start/End Year:

1990 - 1994

Institution:

Horn Point Laboratory, University of Maryland Center for Environmental Science

Co-Principal Investigator:

Michael R. Roman, Horn Point Laboratory, University of Maryland Center for Environmental Science

Topic(s):

Description:

We propose to determine if the control of copepod populations in the spring and fall are due to predation by gelatinous zooplankton (top-down control), or due to food limitations (bottom-up control). We will measure predation rates on copepods and ctenophores by gelatinous species, biomass of gelatinous and crustacean zooplankton, copepod grazing rates on phytoplankton, protozoa and detritus, and copepod reproduction.

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