Short-term occupancy and abundance dynamics of the Oregon Spotted Frog (Rana pretiosa) across its core range

Authors: Michael J Adams; Chris A Pearl; B McCreary; S Galvan
Contribution Number: 489


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 panel frame design (2010–13) in the Klamath and Deschutes Basins, Oregon, which encompass most of the species’ core extant range. Oregon spotted frogs are decreasing in probability of both site occupancy and abundance. 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 about current (2014) trends. Further study is essential to understand how habitat changes and management practices relate to the status and trends of this species.

Publication details
Published Date: 2014-11-03
Outlet/Publisher: U.S. Geological Survey Open-File Report 2014-1230
Media Format: .PDF

ARMI Organizational Units:
Pacific Northwest - Biology
Monitoring and Population Ecology
Place Names:
Oregon; Pacific Northwest
monitoring; occupancy; pond-breeding amphibians; wetlands
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