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The introduction and establishment of nonindigenous species is a significant threat to native biodiversity worldwide (Vitousek et al., 1996; Mack et al., 2000). The adverse ecological impacts of such species on native taxa are generally attributed to several basic mechanisms, perhaps the most obvious of which is the direct predation of native organisms by a nonindigenous species (Simberloff, 1997). In the most extreme cases, predation by nonindigenous species has caused the extinction of native and endemic faunas (eg, Honegger, 1981; Savidge, 1987; Atkinson, 1989). Although the impacts of nonindigenous predators are not always this severe, they are nonetheless worrisome if native community structure is significantly altered. For these reasons the study of the impacts of potentially injurious invasive predators is an essential component of biodiversity conservation.

The nonindigenous Cuban Treefrog, Osteopilus septentrionalis, has been established in mainland Florida, USA since at least 1951 (Schwartz, 1952) and has since spread to occupy much of peninsular Florida where it occurs syntopically with several native anurans (Meshaka, 2001). Anecdotal reports of lo-