Regional scale climate forcing of mesozooplankton dynamics in Chesapeake Bay |
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| Authors: | David G Kimmel W David Miller Michael R Roman |
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| Institution: | (1) Horn Point Laboratory, University of Maryland Center for Environmental Science, P.O. Box 775, Cambridge, MD 21613, USA;(2) National Research Council, US Naval Research Laboratory, 4555 Overlook Avenue, SW, Washington, DC 20375, USA;(3) Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, P.O. Box 38/1, Williams Street, Solomons, MD 20688, USA;(4) Department of Biology/Institute for Coastal Science and Policy, East Carolina University, Greenville, NC 27858, USA |
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| Abstract: | A 16-yr (1985–2000) time series of calanoid copepod (Acartia tonsa andEurytemora affinis) abundance in the upper Chesapeake Bay was examined for links to winter weather variability. A synthesis of sea level pressure
data revealed ten dominant, winter weather patterns. Weather patterns differed in frequency of occurrence as well as associated
precipitation and temperature. The two dominant copepod species responded differently to winter weather variability.A. tonsa abundance showed little response to winter weather and did not vary in abundance during wet or dry springs.E affinis responded strongly to winter weather patterns that produced springs with high freshwater discharge and low salinities. During
wet springs,E. affinis abundance increased overall and its area of dominance extended further down estuary. The different response of the two species
is likely related to several factors including residence time, development time, salinity tolerance, food limitation, and
life history strategy. Important fish species that rely on zo oplankton as food resources were also related to winter weather
variability and spring zooplankton abundance.Morone saxatilis (striped bass) andAnchoa mitchilli (bay anchovy) juvenile indices were positively and negatively correlated toE. affinis abundance, respectively. *** DIRECT SUPPORT *** A02BY003 00004 |
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