Abstract
Predation is often considered as one of the most important biotic factor determining the success of exotic species. The freshwater amphipod Gammarus roeseli has widely colonized Western Europe, where it is frequently found in sympatry with the native species (Gammarus pulex). Previous laboratory experiments revealed that G. roeseli may have an advantage over G. pulex through differential predation by native fish (brown trout). Morphological anti-predator defences (spines) were found responsible for lower rates of predation on the invasive G. roeseli. Here, using both field surveys and laboratory experiments, we tested if a differential of predation exists with other fish predators naturally encountered by gammarids. The main predators present in our field site were nocturnal benthic feeders (mainly bullheads, Cottus gobio). Fish diet analysis showed that, compared to its global availability in the river, G. roeseli was less consumed than G. pulex. In the field, however, G. roeseli was found mainly in the aquatic vegetation whereas G. pulex was found in all habitat types. Laboratory experiments in microcosms revealed that G. roeseli was less prone to predation by C. gobio only when vegetation was present. Depending on the type of predator, the differential of predation could therefore be mediated by antipredator behaviour, and a better usage of refuges, rather than by morphological defences.
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Acknowledgments
This study was funded by the program “Invasions Biologiques” of the French Ministère de l’Ecologie et du Développement Durable (grant #01121), and by a grant from the Conseil Régional de Bourgogne. We thank Bernard Rousseau, Philippe Baran, Pascal Compagnat (Conseil Supérieur de la Pêche) for the help in electric fishing, and Laurent Dutal for the help during field work. All experiments therein have been conducted in accordance with the current laws in France.
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Kaldonski, N., Lagrue, C., Motreuil, S. et al. Habitat segregation mediates predation by the benthic fish Cottus gobio on the exotic amphipod species Gammarus roeseli . Naturwissenschaften 95, 839–844 (2008). https://doi.org/10.1007/s00114-008-0392-x
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DOI: https://doi.org/10.1007/s00114-008-0392-x