Stability and precision of the fish metrics obtained using CEN multi-mesh gillnet in natural and artificial lakes in France
2009
Deceliere-Vergès, Charlotte | Argillier, Christine | Lanoiselée, Cédric | de Bortoli, Julien | Guillard, Jean | Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) ; Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) | Asconit Consultants | Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | Agence Nationale de la Recherche Technique
International audience
Показать больше [+] Меньше [-]Английский. The stability and the precision of fish metrics obtained using CEN multi-mesh benthic nets are compared between twenty-seven natural and artificial French lakes. We show that the natural or artificial origin of the lake has no impact on the precision of the fish metrics provided by the method and it provides more precise catch data in French lakes than in the Nordic countries. The precision of abundances and biomass depends on fish density, and thus on the trophic status of the lake sampled. We also show that the sampling effort advocated by standard is appropriate in French lakes despite its underestimation of species number and disregard of marginal habitats. Nevertheless in deep lakes, the sampling effort could be reduced in the deeper layers which are never informative.
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Эту запись предоставил Institut national de la recherche agronomique