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Open-File Report 2014–1230

Prepared in cooperation with the Interagency Special Status / Sensitive Species Program (ISSSSP). The ISSSSP is a cooperative program of the Pacific Northwest Regional Office of the U.S. Forest Service and Oregon/Washington State Office of the Bureau of Land Management

Short-Term Occupancy and Abundance Dynamics of the Oregon Spotted Frog (Rana pretiosa) Across Its Core Range

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

Thumbnail of and link to report PDF (1.8 MB)Abstract

The Oregon spotted frog (Rana pretiosa) occupies only a fraction of its original range and is listed as Threatened under the Endangered Species Act. We surveyed 93 sites in a rotating frame design (2010–13) in the Klamath and Deschutes Basins, Oregon, which encompass most of the species’ core extant range. Oregon spotted frogs are declining in abundance and probability of site occupancy. We did not find an association between the probability that Oregon spotted frogs disappear from a site (local extinction) and any of the variables hypothesized to affect Oregon spotted frog occupancy. This 4-year study provides baseline data, but the 4-year period was too short to draw firm conclusions. Further study is essential to understand how habitat changes and management practices relate to the status and trends of this species.

First posted October 4, 2014

For additional information, contact:
Director, Forest and Rangeland Ecosystem Science Center
U.S. Geological Survey
777 NW 9th St., Suite 400
Corvallis, Oregon 97330
http://fresc.usgs.gov/

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Suggested citation:

Adams, M.J., Pearl, C.A., McCreary, B., and Galvan, S.K., 2014, Short-term occupancy and abundance dynamics of the Oregon spotted frog (Rana pretiosa) across its core range: U.S. Geological Survey Open-File Report 2014-1230, 10 p., https://dx.doi.org/10.3133/ofr20141230.

ISSN 2331-1258 (online)



Contents

Abstract

Introduction

Methods

Analysis

Results

Discussion

Summary

Acknowledgments

References Cited

Appendix A. Site Names, Cluster Names, Frame Assignments, and Coordinates of Survey Sites


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