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Contribution of anadromous fish to the diet of European catfish in a large river system. | LitMetric

Contribution of anadromous fish to the diet of European catfish in a large river system.

Naturwissenschaften

EcoLab, UMR 5245 (CNRS-UPS-INPT), Université Paul Sabatier, bât 4R3, 118, route de Narbonne, 31062 Toulouse Cedex 9, France.

Published: May 2009

AI Article Synopsis

Article Abstract

Many anadromous fish species, when migrating from the sea to spawn in fresh waters, can potentially be a valuable prey for larger predatory fish, thereby efficiently linking these two ecosystems. Here, we assess the contribution of anadromous fish to the diet of European catfish (Silurus glanis) in a large river system (Garonne, southwestern France) using stable isotope analysis and allis shad (Alosa alosa) as an example of anadromous fish. Allis shad caught in the Garonne had a very distinct marine delta(13)C value, over 8 per thousand higher after lipid extraction compared to the mean delta(13)C value of all other potential freshwater prey fish. The delta(13)C values of European catfish varied considerably between these two extremes and some individuals were clearly specializing on freshwater prey, whereas others specialized on anadromous fish. The mean contribution of anadromous fish to the entire European catfish population was estimated to be between 53% and 65%, depending on the fractionation factor used for delta(13)C.

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Source
http://dx.doi.org/10.1007/s00114-009-0511-3DOI Listing

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