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HIGH AMPHIPODA SPECIES RICHNESS IN THE NERT GROUNDWATER SYSTEM (SOUTHERN FRANCE)

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Two types of habitats in the alluvial sediments of the Nert stream (a tributary of the Salat, in the Garonne drainage basin) were investigated. In the hyporheic habitat, six stygobite amphipod species (Salentinella gineti, S. petiti, Parasalentinella rouchi, Niphargus pachypus, N. gineti, and Ingolfiella thibaudi) were caught, during a 13 month sampling campaign and within an area of 30 m2 (sampled at 0.6 m and 1.0 m depth). With the aid of two piezometres, located in the alluvial plain (15-20 m removed from the stream), the previous six species were found again over a six month sampling period, and another stygobite amphipod, Niphargus robustus was caught, too. The quantitative micro-spatial distributions of the amphipods are presented, and the origin of this unusually large local biodiversity is discussed.

Deux types d'habitat dans les sediments alluviaux du Nert (affluent du Salat dans le bassin de la Garonne) on ete etudies. Dans l'habitat hyporheique, six especes d'Amphipodes on ete recoltees (Salentinella gineti, S. petiti, Parasalentinella rouchi, Niphargus pachypus, N. gineti, Ingolfiella thibaudi) lors d'une campagne de prelevements d'une duree de 13 mois au cours de laquelle une aire de 30 m2 a ete prospectee a 0,6 m et 1,0 m de profondeur. Dans la plaine alluviale, deux piezometres situes a respectivement 15 et 20 metres du cours d'eau on fait l'objet de prelevements pendant une periode de six mois. Outre les six especes precitees, un autre Amphipode stygobie Niphargus robustus, a ete decouvert. La distribution spatiale quantitative de ces especes d'Amphipodes est presentee et l'origine de cette biodiversite locale elevee est egalement discutee.

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