Development of new metrics to assess low species rivers, use of age and size classes of fish. Improving the ecological status of fish communities in inland waters. - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2009

Development of new metrics to assess low species rivers, use of age and size classes of fish. Improving the ecological status of fish communities in inland waters.

Maxime Logez
Didier Pont
  • Fonction : Auteur
  • PersonId : 1093083

Résumé

Development of new metrics to assess low species rivers, use of age and size classes of fish Logez Maxime1, Pont Didier2, Bady Pierre2 1 Cemagref Aix en Provence, 3275 Route de Cézanne, Aix-en-Provence, 13182, France. 2 Cemagref Antony, Parc de Tourvoie, Antony, 92163, France. To response to the implementation of the Water Framework Directive (WFD), scientists had to develop new tools to assess the ecological status' of water bodies. The European Fish Index developed during the FAME project, was the first tool developed at the European scale to evaluate the ecological status of streams. The efficiency of this multi metric index, based on fish community structure, has already been demonstrated, especially its sensitivity to chemical pressures. Nonetheless, in low species rivers, the ability of this index to detect human disturbance seemed to be lowest than in largest and more species-rich rivers. One of the main objectives of the EFI+ project was to develop new metrics specific of low species rivers to extend the area of application of the Index. Two approaches were developed. In a first time, we focused our research on a European widespread species: the brown trout Salmo trutta fario. For each trout populations we split the young of the year from the older fishes and we computed different metrics based on abundances, densities and relative abundances of one of the age classes. In a second time, we developed new metrics based on the combination of size classes and functional guilds. For each metric, we tried to model statistically the the metric response to environmental variability. When the adequacy of the models was enough satisfying, we tested the sensitivity of the metric to several human pressures. Among the one hundred and twelve metrics tested, only four were both related to environment and sensitive to human pressures. All those metrics were based on the combination of size classes with functional guilds. None of the metrics based on trout age classes could be useful for the EFI+ project. Our experiment provided new metrics to assess the ecological status' of low species rivers.
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hal-02592971 , version 1 (15-05-2020)

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Maxime Logez, Pierre Bady, Didier Pont. Development of new metrics to assess low species rivers, use of age and size classes of fish. Improving the ecological status of fish communities in inland waters.. International Symposium and EFI+ Workshop, Mar 2009, Hull, United Kingdom. ⟨hal-02592971⟩
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