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Pelophylax cf. ridibundus attempting to eat a subadult Pelobates cultripes. (A) Partially ingested. (B) After disturbance and release of prey. Photographs by Nicolas Fuento.
Contexts in source publication
Context 1
... was recorded during a nocturnal survey targeting P. cultripes in the commune of Oppède in the Vaucluse Département, France (43.859331ºN, 5.14725ºE; Fig. 1A). Although our photographs here strongly suggest its identity as P. ridibundus, given the presence of other native and introduced Pelophylax in the area and its status as a species complex in the absence of genetic testing, we use a tentative species designation here. Despite the size of the P. cultripes individual, more than half of ...
Context 2
... cf. ridibundus that was attempting to swallow it. Given the disturbance caused by the photographer, the toad was released shortly after the photos were taken. The observations reported here demonstrate the effectiveness of predation on metamorphosed individuals by P. cf. ridibundus, which can severely injure its prey with its dental lamina (Fig. 1B). To our knowledge, this is the first documented case of attempted predation by an individual of the P. ridibundus complex on a metamorphosed P. ...
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Citations
Invasive alien anurans are introduced worldwide in freshwater ecosystems where they can have a strong impact on native organisms such as amphibians. The risk for natives is dependent on the degree of niche overlap and co-occurrence in pond-breeding sites. In the present study, we focused on alien marsh frogs (Pelophylax ridibundus) that are invading nationwide areas in Western Europe and which prey on both caudates and anurans. We assessed aquatic habitat preferences, pond use and environmental niche overlap between invasive populations of marsh frogs and five species of native amphibian prey of the Larzac plateau (southern France). Due to their large environmental niche, marsh frogs have become the most ubiquitous amphibians in the area. Occupancy models revealed that they had aquatic habitat preferences (e.g., water depth and aquatic vegetation) similar to most species of native amphibians. This resulted in a large overlap between the environmental niche of the invader and its potential prey. The frequent coexistence in ponds therefore exposed native species to predation risk and other potential disturbances caused by marsh frogs. Altogether, these results highlight on the risks posed by such opportunist invaders for native amphibians that occur in their wide invasion range.
