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Variabilité spatiale multiéchelle du zooplancton dans un lagoon récifal côtier (Multiscale spatial variability of zooplankton in a coastal reef lagoon)

Abstract : Multiscale spatial variability of zooplankton in a coastal reef lagoon - The identification of changes in ecological patterns with scale, and the understanding of the processes that effect these changes are of considerable importance in modern oceanographic studies. In this context, understanding how a biological community responds to the environmental heterogeneity requires the knowledge of generating processes and the spatial scale at which they operate. The spatial relationships between zooplankton variability and environmental heterogeneity are still little known in coastal tropical ecosystems. Thus the objective of the present research has been to determine the scales of spatial dependency of the patterns of zooplankton associated with a coastal reef lagoon and of the underlying environmental processes. In this way, research interests consisted in quantifying patterns of zooplankton variability in space, understanding how patterns change with scale, and determining the physical and biological processes implicated in these spatial patterns. The sampling, carried out along one transect oriented from the coast to the open sea in the Grand Cul-de-Sac Marin lagoon (Guadeloupe, French West Indies) has been focused on two zooplankton size classes (190–600 µm and > 600 µm) for which biomass and abundance have been estimated. The multiscale analysis has been used to characterize the zooplankton patterns at different spatial scales (from the habitat scale to the lagoon scale) and to identify the processes responsible of these spatial structures. This study has shown that the zooplankton variability is a multiscale phenomenon of which the intensity and the spatial scale depend on the organism size, their motility and the response-variable considered (biomass or abundance). Biomass and abundance of the zooplankton associated with the coastal reef lagoon vary in response to the phytoplankton spatial distribution, the zooplankton behaviour, the habitat heterogeneity, the local hydrodynamics, and the meteorological events. The nature and the effects of these processes are dependent on the spatial scale. This work has also shown how the change of spatial scale underlines the different organisation levels in zooplankton community in response to the environmental heterogeneity.
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https://tel.archives-ouvertes.fr/tel-00001767
Contributor : Carol Avois-Jacquet <>
Submitted on : Friday, October 4, 2002 - 1:18:48 PM
Last modification on : Wednesday, December 9, 2020 - 3:09:21 PM
Long-term archiving on: : Tuesday, September 11, 2012 - 6:00:23 PM

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  • HAL Id : tel-00001767, version 1

Citation

Carol Avois-Jacquet. Variabilité spatiale multiéchelle du zooplancton dans un lagoon récifal côtier (Multiscale spatial variability of zooplankton in a coastal reef lagoon). Autre. Université Pierre et Marie Curie - Paris VI, 2002. Français. ⟨tel-00001767⟩

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