Open-File Report 2010–1235
The Columbia spotted frog (Rana luteiventris) occupies a large range in western North America and is comprised of at least three genetic units. Concern exists regarding the status of the Great Basin populations in Oregon, Idaho, and Nevada. We surveyed target and nearby alternate sites on public lands in southeastern Oregon where there was evidence that Columbia spotted frogs were historically present. We found the species at 59.5 percent (25 of 42) of target or nearby alternate sites. They were in 15 of 23 permanent streams and 8 of 13 intermittent streams. Our surveys do not provide evidence of widespread population losses in our sites. Interpretation of status of Columbia spotted frogs in this study is limited by a lack of precision in some of the historical locations and by our inability to determine if locations where only adults were indicated in the historical record once had breeding populations. Our results support the need for continued investigation of these populations.
First posted September 29, 2010
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Pearl, C.A., Galvan, S.K., Adams, M.J., and McCreary, B., 2010, Columbia spotted frog (Rana luteiventris) in southeastern Oregon: A survey of historical localities, 2009: U.S. Geological Survey Open-File Report 2010-1235, 96 p.
Appendix A. Descriptions of Target, Alternate, and Incidental Surveys
Appendix B. Human Footprint Scores for Target Sites
Appendix C. Land Use Around Target Sites (Percentage of 2-kilometer Radius Buffer)
Appendix D. Definitions for Land Cover Data (from Homer and others, 2004)
Appendix E. Distance to Nearest Agriculture for Target Sites
Appendix F. Agriculture in Watershed for Target Sites
Appendix G. Total Mapped Water within 1-kilometer Radius Buffers for Target Sites
Appendix H. Recent Herbicide Applications near Selected Target Sites