Late-season movement and habitat use by Oregon spotted frog (Rana pretiosa) in a large reservoir in Oregon, USA

Authors: Christopher A Pearl; Jennifer C Rowe; Brome McCreary; Michael J Adams
Contribution Number: 822


Dam-created reservoirs are common landscape features that can provide habitat for amphibians, but their water level
fluctuations and nonnative predators can differ markedly from more natural habitats. We compared fall movement and habitat use by the
Oregon Spotted Frog (Rana pretiosa) in the reservoir pool with nearby river and pond habitats at Crane Prairie Reservoir in central
Oregon, USA. Movement rate of frogs in the river and ponds declined as water temperature cooled. Reservoir frogs moved further than
those in the river or ponds, and their movement rate increased as water temperature cooled. Most frog locations across all site types were
in aquatic herbaceous vegetation. We did not find shifts in habitat between early and late fall. Increased movement and the lack of
habitat shift in our reservoir frogs deeper into fall contrast with R. pretiosa in non-reservoir sites in this study and others. Consistent use
of vegetation by reservoir frogs throughout the fall could indicate cover use in presence of fish predators. Our study provides additional
detail on the range of habitats used by R. pretiosa in fall and suggests areas for further work to improve survival in constructed sites with
abundant fish predators.

Publication details
Published Date: 2022-03-04
Outlet/Publisher: Journal of Herpetology
Media Format: URL

ARMI Organizational Units:
Pacific Northwest - Biology
Species and their Ecology; Stressors; Water
Place Names:
Oregon; Pacific Northwest
amphibians; ARMI; dams; habitat; habitat use; movement
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