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.
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1 January 2011
Non-Native Species Impacts on Pond Occupancy by an Anuran
Michael J. Adams,
Christopher A. Pearl,
Stephanie Galvan,
Brome McCreary
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Journal of Wildlife Management
Vol. 75 • No. 1
January 2011
Vol. 75 • No. 1
January 2011
Bullfrogs
colonization
Fish
local extinction
non-native species
northern red-legged frog
occupancy