Christopher A Pearl
I am a Wildlife Biologist at the USGS Forest and Rangeland Ecosystem Science Center in Corvallis, OR.
I work on research and monitoring studies for a variety of aquatic and terrestrial species in the Pacific Northwest. I am particularly interested in restoration of wetland and riparian systems, herpetology, and interactions between native and invasive species.
Professional Experience
2001-Present: Wildlife Biologist, USGS Forest and Rangeland Ecosystem Science Center, Corvallis, OR
The Nature Conservancy
Faculty Research Associate, Oregon State University, Corvallis, OR
Education and Certifications
M.S., Environmental Studies, University of Oregon (1999)
B.S., Community Forestry and Horticulture, University of Vermont, Burlington, VT (1988)
Science and Products
If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.
If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.
Feeding behavior and aquatic habitat use by Oregon spotted frogs (Rana pretiosa) in central Oregon
Observations of Interspecific amplexus between western North American ranid frogs and the introduced American bullfrog (Rana catesbeiana) and an hypothesis concerning breeding interference
Rana catesbeiana (American Bullfrog). Chytridiomycosis
Asymmetrical effects of introduced Bullfrogs (Rana catesbeiana) on native Ranid Frogs in Oregon
Cannibalism and predation by western toad (Bufo boreas boreas) larvae in Oregon, USA
Optical characteristics of natural waters protect amphibians from UV-B in the U.S. Pacific Northwest: Reply
Wetland management for amphibians in the Willamette Valley
Asymmetrical effects of introduced Rana catesbeiana on native ranid frogs in Oregon, USA
Indirect facilitation of an anuran invasion by non-native fishes
Ambystoma gracile (Northwestern salamander) egg predation
Behavioral responses of anuran larvae to chemical cues of native and introduced predators in the Pacific Northwestern United States
Fire and amphibians in North America
Science and Products
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If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.
Filter Total Items: 18No Result Found - Publications
If you are unable to access or download a product, email fresc_outreach@usgs.gov a request, including the full citation, or call (541) 750-1030.
Filter Total Items: 67Feeding behavior and aquatic habitat use by Oregon spotted frogs (Rana pretiosa) in central Oregon
No abstract available.AuthorsChristopher A. Pearl, Jay Bowerman, Donnie KnightObservations of Interspecific amplexus between western North American ranid frogs and the introduced American bullfrog (Rana catesbeiana) and an hypothesis concerning breeding interference
Introduced American bullfrogs (Rana catesbeiana) come in contact with native amphibians on four continents and are well established in lowlands of western North America. To date, research on the effects of introduced bullfrogs on native frogs has focused on competition and predation, and is based largely on larval interactions. We present observations of interspecific amplexus between bullfrogs anAuthorsChristopher A. Pearl, M. P. Hayes, Russ Haycock, Joseph D. Engler, Jay BowermanRana catesbeiana (American Bullfrog). Chytridiomycosis
No abstract available.AuthorsChristopher A. Pearl, D. E. GreenAsymmetrical effects of introduced Bullfrogs (Rana catesbeiana) on native Ranid Frogs in Oregon
Introduced American Bullfrogs (Rana catesbeiana) have become widely established in the Pacific Northwest over the last century and are thought to be an important predator of native amphibians throughout the western United States. The Northern Red-Legged Frog (Rana aurora aurora) and Oregon Spotted Frog (Rana pretiosa) historically coexisted in portions of the Pacific Northwest now invaded by R. caAuthorsC.A. Pearl, M.J. Adams, R.B. Bury, B. McCrearyCannibalism and predation by western toad (Bufo boreas boreas) larvae in Oregon, USA
Larval amphibians have been widely used as model organisms in studies of community ecology of freshwater systems (Morin 1983, Alford 1999). Much of this work has assumed that trophic effects of larval anurans are focused on periphyton and planktonic algae (Dickman 1968, Seale 1980, Duellman and Trueb 1986), a view that has recently been questioned. Recent experiments suggest that anuran larvae canAuthorsD.J. Jordan, C.J. Rombough, Christopher A. Pearl, B. McCrearyOptical characteristics of natural waters protect amphibians from UV-B in the U.S. Pacific Northwest: Reply
Few ecologists would dispute that exposure to high levels of ultraviolet-B radiation (UV-B) is detrimental to organisms. It is well established that UV-B has been a critical factor shaping the physiology (Blum et al. 1949, Hansson 2000), behavior (Pennington and Emlet 1986, van de Mortel and Buttemer 1998), and distribution (Williamson et al. 2001, Leavitt et al. 2003) of many aquatic species. RecAuthorsWendy J. Palen, Daniel E. Schindler, M. J. Adams, Christopher A. Pearl, R. Bruce Bury, S. A. DiamondWetland management for amphibians in the Willamette Valley
Introduction In the past two decades, scientists around the world have increasingly noted losses of amphibian populations. Many of these declines have occurred in protected areas like national parks, where the causes mostly remain mysterious. However, in multipleuse landscapes, resource managers frequently face more obvious conservation problems and must make decisions that will affect amphibiaAuthorsM. J. Adams, Christopher A. Pearl, R. Bruce BuryAsymmetrical effects of introduced Rana catesbeiana on native ranid frogs in Oregon, USA
Introduced American Bullfrogs (Rana catesbeiana) have become widely established in the Pacific Northwest over the last century and are thought to be an important predator of native amphibians throughout the western United States. The Northern Red-Legged Frog (Rana aurora aurora) and Oregon Spotted Frog (Rana pretiosa) historically coexisted in portions of the Pacific Northwest now invaded by R. caIndirect facilitation of an anuran invasion by non-native fishes
Positive interactions among non-native species could greatly exacerbate the problem of invasions, but are poorly studied and our knowledge of their occurrence is mostly limited to plant-pollinator and dispersal interactions. We found that invasion of bullfrogs is facilitated by the presence of co-evolved non-native fish, which increase tadpole survival by reducing predatory macroinvertebrate densiAuthorsM. J. Adams, Christopher A. Pearl, R. Bruce BuryAmbystoma gracile (Northwestern salamander) egg predation
No abstract available.AuthorsChristopher A. PearlBehavioral responses of anuran larvae to chemical cues of native and introduced predators in the Pacific Northwestern United States
We compared behavioral responses of larvae of three Pacific Northwest anurans from different hydroperiods to water borne cues of native and introduced predators. Two native anurans (Pacific Treefrog, Pseudacris regilla, and Northern Red-Legged Frog, Rana aurora aurora) and introduced Bullfrogs (Rana catesbeiana) responded to water conditioned by native Redside Shiners (Richardsonius balteatus) byAuthorsChristopher A. Pearl, M. J. Adams, Gerald S. Schuytema, A.V. NebekerFire and amphibians in North America
Information on amphibian responses to fire and fuel reduction practices is critically needed due to potential declines of species and the prevalence of new, more intensive fire management practices in North American forests. The goals of this review are to summarize the known and potential effects of fire and fuels management on amphibians and their aquatic habitats, and to identify information gaAuthorsD. S. Pilliod, R.B. Bury, E.J. Hyde, C.A. Pearl, P. S. Corn - News