Comparison of Fish Assemblage Diversity in Natural and Artificial Rip‐Rap Habitats in the Littoral Zone of a Large River (River Danube, Hungary)
Identifieur interne : 000707 ( Main/Exploration ); précédent : 000706; suivant : 000708Comparison of Fish Assemblage Diversity in Natural and Artificial Rip‐Rap Habitats in the Littoral Zone of a Large River (River Danube, Hungary)
Auteurs : Tibor Er S [Hongrie] ; Balázs T Th [Hongrie] ; András Sevcsik [Hongrie] ; Dénes Schmera [Hongrie]Source :
- International Review of Hydrobiology [ 1434-2944 ] ; 2008-02.
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Abstract
We studied day‐night patterns in fish diversity in natural, gravel‐sand stretches and boulder covered rip‐rap habitats in the littoral zone of the River Danube. Sample‐based rarefaction indicated marked differences in species richness between day and night, and smaller differences between habitats for both day and night. Whereas, individual‐based rarefaction indicated no such substantial differences in species richness. However, distinct fish assemblages were found based on relative abundance data, and species of great conservation concern tended to link to natural habitats. The diversity of biological traits/attributes were generally higher in rip‐rap habitats. The differences in fish assemblage characteristics between habitats revealed the importance of gravel‐sand habitats in maintaining natural assemblages and that rip‐rap sections increase compositional beta diversity at the mesohabitat scale. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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DOI: 10.1002/iroh.200710976
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Sample‐based rarefaction indicated marked differences in species richness between day and night, and smaller differences between habitats for both day and night. Whereas, individual‐based rarefaction indicated no such substantial differences in species richness. However, distinct fish assemblages were found based on relative abundance data, and species of great conservation concern tended to link to natural habitats. The diversity of biological traits/attributes were generally higher in rip‐rap habitats. The differences in fish assemblage characteristics between habitats revealed the importance of gravel‐sand habitats in maintaining natural assemblages and that rip‐rap sections increase compositional beta diversity at the mesohabitat scale. (© 2008 WILEY‐VCH Verlag GmbH & Co. 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