SS1.09 Fisheries Population Linkage Spatial and Temporal Variation in Zooplankton
Date: Wednesday, June 12, 2002
Time: 5:00:00 PM
Location: Carson C
 
DahlL, Univ. Copenhagen/Danish Inst. Fish. Res., Charlottenlund, Denmark, lda@dfu.min.dk
 
SPATIAL VARIABILITY IN THE DISTRIBUTION OF MARINE ZOOPLANKTON
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Marine planktonic organisms are patchily distributed, and characterized by a large degree of variability and heterogeneity, that is hard to describe quantitatively. In the present ph.d.-project I intend to use nonlinear mathematical methods to approach quantitatively the problems of spatial distributional patterns and trophic interactions of zooplankton. The study is based on sampling during three cruises in March-May 2001 around frontal areas in the North Sea (NE Atlantic). Horizontally and vertically stratified sampling (predominantly with opening-closing nets) provides detailed information about distributional patterns and spatial overlap between planktonic predator and prey species. The primary target organisms are fish larvae and their key prey organisms, copepods. The differences in species composition and abundances between samples will be evaluated statistically. Nonlinear mathematical analyses of the observed patterns will then be carried out, and the observations will be fitted into mathematical models relating to appropriate physical (water density, turbulence etc.) and biological (predation, migration etc.) parameters.