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

Syväranta, Jari and Cucherousset, Julien and Kopp, Dorothée and Martino, Aurelia and Céréghino, Régis and Santoul, Frédéric Contribution of anadromous fish to the diet of European catfish in a large river system. (2009) Naturwissenschaften, 96 (5). 631-635. ISSN 1432-1904

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Official URL: http://dx.doi.org/10.1007/s00114-009-0511-3

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.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The original PDF of the article can be found at Naturwissenschaften website : http://link.springer.com/journal/114
HAL Id:hal-00906935
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Bournemouth University - BU (UNITED KINGDOM)
Laboratory name:
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Deposited By: Frédéric Santoul
Deposited On:20 Nov 2013 14:03

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