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The influence of fish farming intensification on taxonomic richness and biomass density of macrophyte-dwelling invertebrates in French fishponds Influence de l’intensification des pratiques piscicoles sur la richesse taxonomique et la densité de biomasse des invertébrés dans les herbiers de macrophytes des étangs en France

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Author(s): Broyer J. | Curtet L.

Journal: Knowledge and Management of Aquatic Ecosystems
ISSN 1961-9502

Issue: 400;
Start page: 10;
Date: 2011;
Original page

Keywords: macro-invertebrates | taxonomic richness | biomass density | macrophytes | fish farming | macro-invertébrés | richesse taxonomique | densité de biomasse | macrophytes | pisciculture en étangs

ABSTRACT
Fishponds are man-made ecosystems where fish farming may strongly interfere with biodiversity. Intensified practices could be suspected to have a negative impact on animal and plant communities. We investigated the hypothesis that, in French fishponds, taxonomic richness and biomass density of macrophyte-dwelling macro-invertebrates could be influenced by fish stock density and pond fertilization. With a sample of 95 water bodies from three of the most important fishpond regions, studied in 2000, 2001 or 2002, we compared a series of models in which macrophyte cover (in three classes), emergent shore vegetation (in % of pond area) and invertebrate biomass in pond sediment were also considered. Among explanatory variables, macrophyte and helophyte abundance were included in the best models explaining variation in invertebrate taxonomic richness and in biomass density. Taxonomic richness was lower when abundance of both macrophytes and emergent shore vegetation was low (
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