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Open-File Report 2010–1235

Prepared in cooperation with the Oregon/Washington U.S. Bureau of Land Management and Region 6 U.S. Forest Service Interagency Special Status/Sensitive Species Program (ISSSSP)

Columbia Spotted Frog (Rana luteiventris) in Southeastern Oregon: A Survey of Historical Localities, 2009

By Christopher A. Pearl, Stephanie K. Galvan, Michael J. Adams, and Brome McCreary

Thumbnail of and link to report PDF (3.2 MB)ABSTRACT

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

For additional information contact:
Director, Forest and Rangeland Ecosystem Science Center,
U.S. Geological Survey,
777 NW 9th Street
Corvallis, Oregon 97330

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Suggested citation:

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.









References Cited

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

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