Invertebrate distribution patterns and river typology for the implementation of the water framework directive in Martinique, French Lesser AntillesReport as inadecuate




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1 ECOLAB - Laboratoire Ecologie Fonctionnelle et Environnement - ECOLAB 2 Asconit Consultants

Abstract : Over the past decade, Europe-s Water Framework Directive provided compelling reasons for developing tools for the biological assessment of freshwater ecosystem health in member States. Yet, the lack of published study for Europe-s overseas regions reflects minimal knowledge of the distribution patterns of aquatic species in Community-s outermost areas. Benthic invertebrates 84 taxa and land cover, physical habitat and water chemistry descriptors 26 variables were recorded at fifty-one stations in Martinique, French Lesser Antilles. Canonical Correspondence Analysis and Ward-s algorithm were used to bring out patterns in community structure in relation to environmental conditions, and variation partitioning was used to specify the influence of geomorphology and anthropogenic disturbance on invertebrate communities. Species richness decreased from headwater to lowland streams, and species composition changed from northern to southern areas. The proportion of variation explained by geomorphological variables was globally higher than that explained by anthropogenic variables. Geomorphology and land cover played key roles in delineating ecological sub-regions for the freshwater biota. Despite this and the small surface area of Martinique 1080 km², invertebrate communities showed a clear spatial turnover in composition and biological traits e.g., insects, crustaceans and molluscs in relation to natural conditions.

Keywords : Biological Indicators Overseas regions Reference conditions River classification Tropical rivers





Author: Caroline Bernadet - Heliott Touron-Poncet - C. Desrosiers - Arthur Compin - Nicolas Bargier - Régis Céréghino -

Source: https://hal.archives-ouvertes.fr/



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