What are American bullfrogs (Lithobates canesbeiana) at Lomond Lake in British Columbia eating? American bullfrogs are large, aquatic frogs that eat almost anything in front of them. After they were introduced to the province of BC, they began to spread and displace native amphibians. In some instances, they prey directly on the native amphibians. This research was done to gain an understanding of the diets of American bullfrogs through literature, to determine the diet trends and key prey species of bullfrogs at Lomond Lake, and to determine if the Lomond Lake population was preying on native amphibians. Bullfrog specimens from Lomond Lake were dissected and their stomach contents analyzed and organized in Microsoft Excel. Of the 34 bullfrogs dissected, 78% of the stomachs with contents contained insects. Almost 90% of the total stomach contents were insects. Other contents included arachnids, mammals, and vegetation. No native amphibians were identified within the stomach contents. This may be because of a lack of native amphibians at Lomond Lake, the availability of other more suitable prey options, or due to the small size of our specimens. Dissecting a larger number of Lomond Lake bullfrogs may help to further define the trends in their diets and help to confirm that our analyses are relevant to the whole population. Conducting similar research on the diets of amphibians native to Lomond Lake may deepen our understanding of why the bullfrogs do not appear to be preying on them currently and assess their risk of displacement and predation in the future.
