Science Serving Maryland's Coasts

R/P-28

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

Principal Investigator: 

Jennifer E. Purcell

Start/End Year: 

1990 to 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.