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Freshwater fishes [Diversity] [Biogeography] [Hydrographic units] [Water masses] [Depth] [Sediments] [Wetlands] [Local richness] [Rarity] [Conservation status] [Diversity and conservation] |
Saltwater fishes [Diversity] [Biogeography] [Salinity gradient] [Aquatic physiographic units] [Distance from the shore] [Depth] [Sediments] [Local richness] [Rarity] [Conservation status] [Diversity and conservation] |
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| Freshwater fishes of the St. Lawrence: local richness |
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The map of the disparities between the richness of a unit according to local fishing surveys and richness as predicted by the regional species-area curve reveals the spatial distribution of units rich and poor in species. The main hot spots are located in the upstream portion of the Lake of Two Mountains, the southwestern part of Lake St. Louis, the area downstream from the Lachine Rapids, the area upstream and downstream of the Rivière des Mille Îles and the Rivière des Prairies, at the confluence of the St. Lawrence downstream of the Montreal Archipelago, and around the Contrecoeur and Sorel islands. Regions relatively poor in species comprise Lake St. Francis, the eastern portion of the Lake of Two Mountains, the Laprairie Basin and a large portion of the St. Lawrence opposite Montreal, Lake St. Pierre downstream from the Sorel Archipelago and the freshwater and brackish-water estuaries as a whole. The apparent hot spot around Saint-Nicolas is due to the lengthy time series of fishing data collected by the Quebec City Aquarium. In the Quebec City region, Beauport Bay and the upstream portion of the northern channel of Île d'Orléans form a hot spot in the freshwater estuary, relatively speaking. This map contains a great deal of information on the regional distribution of the species richness of freshwater fishes in the St. Lawrence.
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