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Trophic ecology of the pikeperch (Sander lucioperca) in its introduced areas: a stable isotope approach in southwestern France

Kopp, Dorothée and Cucherousset, Julien and Syväranta, Jari and Martino, Aurelia and Céréghino, Régis and Santoul, Frédéric Trophic ecology of the pikeperch (Sander lucioperca) in its introduced areas: a stable isotope approach in southwestern France. (2009) Comptes Rendus Biologies, 332 (9). 741-746. ISSN 1631-0691

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Official URL: http://dx.doi.org/10.1016/j.crvi.2009.04.001

Abstract

During the last decades, non-native predatory fish species have been largely introduced in European lakes and rivers, calling for detailed information on the trophic ecology of co-existing native and non-native predators. The present study describes the trophic ecology of the introduced pikeperch (Sander lucioperca) in two southwestern French rivers, using stable isotope analysis. Pikeperch could be categorized as a top-predator, and had a significantly higher trophic position (TP, mean±SE=4.2±0.1) compared to other predatory fish such as the native pike (Esox lucius, TP=3.7±0.1) and the introduced European catfish (Silurus glanis, TP=3.8±0.1). Most studies of resource use in freshwaters consider predatory fish as ecologically equivalent; however, this study showed that the pikeperch occupied a higher trophic niche compared to other predatory species in the Lot and Tarn rivers (Garonne River basin). This apparent specialization may thus have consequences upon interspecific relationships within the predatory guild and upon the functional organization of biological communities.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF can be found at http://www.sciencedirect.com/science/article/pii/S163106910900095X
HAL Id:hal-00912965
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:03 Dec 2013 07:42

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