Non-native species impacts on pond occupancy by an anuran |
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Authors: | Michael J Adams Christopher A Pearl Stephanie Galvan Brome Mccreary |
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Institution: | U. S. Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR 97331, USA |
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Abstract: | Non-native fish and bullfrogs (Lithobates catesbeianus) are frequently cited as contributing to the decline of ranid frogs in the western United States, so we hypothesized that non-native species, habitat, or a combination of these relate to the probability of local extinction for northern red-legged frogs (Rana aurora) in Oregon, USA. We also hypothesized that the probability of colonization relates to land use, wetland size, or riparian forest. In a 5-yr study, we found no support for an effect of non-native species on northern red-legged frogs. Instead, probability of local extinction decreased with the extent of emergent vegetation and riparian forest. This finding suggests that managers consider the role of habitat when confronting non-native species problems. © 2010 The Wildlife Society. |
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Keywords: | bullfrogs colonization fish local extinction non-native species northern red-legged frog occupancy Rana aurora wetlands |
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