Environmental factors as forces structuring the fish community of the Elbe Estuary
Identifieur interne : 001525 ( Istex/Curation ); précédent : 001524; suivant : 001526Environmental factors as forces structuring the fish community of the Elbe Estuary
Auteurs : R. Thiel [Allemagne] ; A. Sepúlveda [Allemagne] ; R. Kafemann [Allemagne] ; W. Nellen [Allemagne]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 1995-01.
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- KwdEn :
Abstract
Smelt, flounder, eel, three‐spined stickleback, twaite shad, ruffe and herring were the major species among 62 forming the fish community of the Elbe estuary. Species richness, species diversity, evenness and total fish biomass decreased in the upstream direction. Total abundance was greatest during summer. Salinity was the most significant physico‐chemical factor affecting species richness and total fish biomass, whereas water temperature was the best predictor of total abundance. Marine fish species decreased with decreasing salinity, while the freshwater species roach and ide were absent at salinities > 15‰. Bream, blue bream, white bream, perch and pikeperch occurred more frequently in shallow marginal regions with lower current velocities, while herring and other marine species occurred closer to the deep central regions with high current velocities. Annual and seasonal variations of the community structure mainly reflected in population dynamics of smelt, flounder, twaite shad, three‐spined stickleback and eel, especially those of 0‐age smelt. Populations of smelt and ruffe and their importance in the fish community increased between 1989 and 1992, while those of twaite shad and eel decreased. At oxygen concentrations <3 mg I1, smelt and flounder were rare, but eels were at their maximum at 3.5 mg I−1. Changes of species composition and fish abundance were closely related to daytime and tidal cycle.
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DOI: 10.1111/j.1095-8649.1995.tb05946.x
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ISTEX:18E785E8E7DBE46A6A5F395799848B065ADA67ACLe document en format XML
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<front><div type="abstract" xml:lang="en">Smelt, flounder, eel, three‐spined stickleback, twaite shad, ruffe and herring were the major species among 62 forming the fish community of the Elbe estuary. Species richness, species diversity, evenness and total fish biomass decreased in the upstream direction. Total abundance was greatest during summer. Salinity was the most significant physico‐chemical factor affecting species richness and total fish biomass, whereas water temperature was the best predictor of total abundance. Marine fish species decreased with decreasing salinity, while the freshwater species roach and ide were absent at salinities > 15‰. Bream, blue bream, white bream, perch and pikeperch occurred more frequently in shallow marginal regions with lower current velocities, while herring and other marine species occurred closer to the deep central regions with high current velocities. Annual and seasonal variations of the community structure mainly reflected in population dynamics of smelt, flounder, twaite shad, three‐spined stickleback and eel, especially those of 0‐age smelt. Populations of smelt and ruffe and their importance in the fish community increased between 1989 and 1992, while those of twaite shad and eel decreased. At oxygen concentrations <3 mg I1, smelt and flounder were rare, but eels were at their maximum at 3.5 mg I−1. Changes of species composition and fish abundance were closely related to daytime and tidal cycle.</div>
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