Bullfrogs in Southern Nevada

1. Effects on threatened and endangered species

Currently, our laboratory is examining the impacts bullfrogs (Rana catesbeiana) have on indigenous species found in southern Nevada wetlands. In our previous work, we have found that bullfrogs are voracious feeders and will consume about anything that fits into their mouths (Cross and Gerstenberger 2002). Of particular interest are the threatened and endangered species that co-exist in areas where bullfrogs have been introduced. Two species of particular concern include the Devil’s Hole Pupfish (Cyprinodon diabolis) and the Amargosa Toad (Bufo nelsoni). Accordingly, we are examining the stomach contents of bullfrogs harvested from areas with healthy populations of these two endangered species.

2. Mercury concentrations in bullfrogs

In addition to the impacts bullfrogs have on indigenous species, we are also examining the concentrations of mercury found in edible tissues (frog legs) an assessing the potential impacts they may have on environmental and human health. Existing mercury data on frogs from remote locations near Carp, Nevada, indicate that they are not accumulation mercury at levels of concern (Gerstenberger & Pearson 2002).

Cross C and Gerstenberger SL (2002). Rana catesbeiana diet. Herpetological Review 33(2):129-130.

Gerstenberger SL and Pearson R (2002). Mercury Concentrations in Bullfrogs (Rana catesbeiana) Collected from a Southern Nevada, USA, Wetland. Bulletin of Environmental Contamination & Toxicology 69(2):210-218.

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