SS1.03 Zooplankton Response to Climate Variability
Date: Monday, June 10, 2002
Time: 2:30:00 PM
Location: Lecture Theatre
 
RomanMR, Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, USA, roman@hpl.umces.edu
Kimmel, D, G, Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, USA, dkimmel@hpl.umces.edu
Zhang, X, , Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, USA, zhang@hpl.umces.edu
 
INFLUENCES OF FRESHWATER INPUTS ON CHESAPEAKE BAY MESOZOOPLANKTON
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Axial mesozooplankton surveys along the 350 km length of Chesapeake Bay were conducted during spring, summer and fall for six years (1995 - 2000). This period covered climatological extremes in freshwater inputs to Chesapeake Bay. We found substantial seasonal and annual variability in the overall mesozooplankton abundance and species composition. Mesozooplankton variability in time and space was driven primarily by temporal patterns of freshwater input. Direct enhancement of mesozooplankton production can occur through freshwater born nutrients and subsequent enhanced primary production. Indirect influences of freshwater flow on mesozooplankton occur through the modulation of gelatinous zooplankton populations, which consume mesozooplankton. Thus freshwater inputs appear to control both bottom-up and top-down controls of Chesapeake Bay mesozooplankton.