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Fish habitat preferences in large streams of southern France

Abstract : Relationships between fish and their habitat over whole geographic regions, evident from studies of many streams and species, can improve understanding of lotic communities and provide reliable management tools. Nevertheless, most habitat preference studies have been based on single sites and confined to small streams and game species. Regional habitat preference models, based on local velocity, depth and roughness, were developed for 24 species and their size classes commonly found in large European streams. Fish surveys were conducted in six large streams in southern France over an eight year period. To limit the influences of habitat variables other than those studied, we estimated fish preferences within each survey and averaged this information across surveys. Preferences were fitted with confidence intervals and their sensitivity to field uncertainty was evaluated. Most species and size classes had significant preferences for local habitat conditions that were consistent across the region. Habitat preferences predominant in the region were not always observed at any one site, but habitat conditions preferred on average in the region were never actually avoided locally. These results support the use of regional preference models for fish, and the development of similar models for other lotic groups whose sensitivity to local habitat conditions has been reported elsewhere.
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Submitted on : Thursday, May 14, 2020 - 7:05:25 PM
Last modification on : Friday, June 25, 2021 - 11:38:03 AM

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  • HAL Id : hal-02578753, version 1
  • IRSTEA : PUB00007596

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N. Lamouroux, H. Capra, M. Pouilly, Yves Souchon. Fish habitat preferences in large streams of southern France. Freshwater Biology, Wiley, 1999, 42 (4), pp.673-687. ⟨hal-02578753⟩

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