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Microrépartition des invertébrés benthiques en eau courante : caractéristiques des microhabitats et organisation de leurs peuplements

Abstract : The aim of this is to examine and to understand more accurately (1) the invertebrate communities organization into the different microhabitats of a river bottom, and (2) environmental factors which affect the organization of these communities. A separate sampling of microhabitats was realized on spring and autumn 1993 and 1994 in 12 stations. Community structure was summarized with biocenotic indices for which we have specify the main performances. Simulations allowed us to consider that the mesological traits of the sampled microhabitats influence strongly the appraisal of the study-site community structure, principally because invertebrates display an aggregate distribution. The study of microdistribution factors show that "substrate type", "current velocity" and, to a less extent, "water death" are of primary importance for the organization of microhabitat communities. These mesological traits focus in fact on three ecological characteristics of the habitat :(1) its capacity to offer a great variety of ecological niches for macroinvertebrates, (2) its trophic potentialities and (3) its temporal stability, which respectively determine the total abundance, the taxonomic richness and the equitability of the community. By another way, the different microhabitat types were described by specific taxa which were sampled on. This method allowed us to draw up their qualities for macroinvertebrate. An original approach of spatial heterogeneity of the substrate mosaic allowed us to show the secondary influence of the environmental characteristics of microhabitat surrounding on the community in place. The community organization seems to be related to the number of potential sources of colonization by invertebrates of neighbouring habitats, and by the stability of its environment. Finally, results obtained at a station scale demonstrate in particular that the faunistic equitability depends on the patchiness of the substrate mosaic, which probably highlights, at this scale but also at the microhabitat scale, the environmental stability concept
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Submitted on : Tuesday, April 24, 2018 - 4:12:18 PM
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  • HAL Id : tel-01777138, version 1



Jean-Nicolas Beisel. Microrépartition des invertébrés benthiques en eau courante : caractéristiques des microhabitats et organisation de leurs peuplements. Biologie animale. Université Paul Verlaine - Metz, 1996. Français. ⟨NNT : 1996METZ026S⟩. ⟨tel-01777138⟩



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