Séminaire de Julien CUCHEROUSSET (UMR Evolution et Diversité Biologique, Toulouse)



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Le vendredi 19 mai 2017 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Le vendredi 19 mai 2017 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Non-native predatory fish and their effects on the trophic structure of recipient communities and food webs

Abstract: Human activities are impacting non-randomly the trophic structure of animal communities, notably by causing the loss of top predators. However, the introduction of non-native species by humans that often select for large-bodied species might replace, at least numerically, lost predators. These species, acting as novel components of recipient food webs, might consume new resources and interact with the ecological effects of other facets of global changes. This is particularly true for fish that are among the most widely introduced organisms in fresh waters. Indeed, because of their strong association with aquaculture or angling, introduced fish species have larger body size and higher trophic position than native species. Understanding how these new predators act on recipient communities and food webs is therefore of utmost importance. The use of stable isotope analyses in trophic ecology has flourished during the last two decades. Stable isotope analyses are based on the predictable relationship between a consumer and its diet and they provide a unique opportunity to assess the structural and functional impacts of novel non-native predators at different spatial scales. Here, using approaches at local and global scales, stable isotope analyses will be used to quantify the novel and unexpected consequences of non-native predatory fish in recipient ecosystems.

Contact: Julien CUCHEROUSSET





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