Étude du benthos d'eau douce dans le haut-estuaire du Saint-Laurent (Québec)

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Abstract
Benthos samples collected in 37 sites interspersed along a 230 km stretch of the St. Lawrence River, between Lake St. Pierre and Ile aux Oies, were analyzed. The distribution of the main taxa shows the downstream succession of many of the dominant species. Benthic groups of the upstream and downstream sections of the upper estuary are characterized by the hydrobiid B. tentaculata and the viviparid V. georgianus, respectively. The structure of the benthic groups undergoes a gradual change downstream from Gentilly and the samples collected in the lower section add up to a much more heterogeneous community than the samples collected in the upper or the middle reaches of the estuary.[Journal Translation]