Biomasses et structures de taille du zooplancton hivernal dans une lagune nord-méditerranéenne
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, meer
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| Abstract |
Normalized biomasses as proposed by Platt & Denman (1978), decrease linearly with organism size, in sea or lake pelagic ecosystems at steady state (Sprules et al., 1988). In a northern Mediterranean lagoon (Étang de Thau), winter zooplankton biomasses, estimated by image analysis, show important fluctuations in every size class. Their averaged size-spectra were characterized by an increasing phase which grouped most of the individuals, and by a decreasing phase linked with less numerous organisms of large size. Size-structure differed from one lagoon area to another, following a gradient of density and of composition. Such structures characterize interface ecosystems where environmental conditions are forcing parameters. |
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