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.
Filter Total Items: 68
Surveys for presence of Oregon spotted frog (Rana pretiosa): background information and field methods Surveys for presence of Oregon spotted frog (Rana pretiosa): background information and field methods
The Oregon spotted frog (Rana pretiosa) is the most aquatic of the native frogs in the Pacific Northwest. The common name derives from the pattern of black, ragged-edged spots set against a brown or red ground color on the dorsum of adult frogs. Oregon spotted frogs are generally associated with wetland complexes that have several aquatic habitat types and sizeable coverage of emergent...
Authors
Christopher A. Pearl, David Clayton, Lauri Turner
Using occupancy models to understand the distribution of an amphibian pathogen, Batrachochytrium dendrobatidis Using occupancy models to understand the distribution of an amphibian pathogen, Batrachochytrium dendrobatidis
Batrachochytrium dendrobatidis is a fungal pathogen that is receiving attention around the world for its role in amphibian declines. Study of its occurrence patterns is hampered by false negatives: the failure to detect the pathogen when it is present. Occupancy models are a useful but currently underutilized tool for analyzing detection data when the probability of detecting a species...
Authors
M. J. Adams, Nathan Chelgren, David M. Reinitz, Rebecca A. Cole, L.J. Rachowicz, Stephanie Galvan, Brome McCreary, Christopher A. Pearl, Larissa L. Bailey, Jamie B. Bettaso, Evelyn L. Bull, Matthias Leu
An 11 000-year-long record of fire and vegetation history at Beaver Lake, Oregon, central Willamette Valley An 11 000-year-long record of fire and vegetation history at Beaver Lake, Oregon, central Willamette Valley
High-resolution macroscopic charcoal and pollen analysis were used to reconstruct an 11??000-year-long record of fire and vegetation history from Beaver Lake, Oregon, the first complete Holocene paleoecological record from the floor of the Willamette Valley. In the early Holocene (ca 11??000-7500 calendar years before present [cal??yr??BP]), warmer, drier summers than at present led to...
Authors
Megan K. Walsh, Christopher A. Pearl, Cathy Whitlock, Patrick J. Bartlein, Marc A. Worona
The effects of simulated solar UVB radiation on early developmental stages of the Northwestern Salamander (Ambystoma gracile) from three lakes The effects of simulated solar UVB radiation on early developmental stages of the Northwestern Salamander (Ambystoma gracile) from three lakes
Solar ultraviolet radiation (UV) has received much attention as a factor that could play a role in amphibian population declines. UV can be hazardous to some amphibians, but the resultant effects depend on a variety of environmental and behavioral factors. In this study, the potential effects of UV on the Northwestern Salamander, Ambystoma gracile, from three lakes were assessed in the...
Authors
Robin D. Calfee, Edward E. Little, Christopher A. Pearl, Robert L. Hoffman
Short-term effect of cattle exclosures on Columbia Spotted Frog (Rana luteiventris) populations and habitat in northeastern Oregon Short-term effect of cattle exclosures on Columbia Spotted Frog (Rana luteiventris) populations and habitat in northeastern Oregon
Livestock grazing is a common land use across the western United States, but concerns have been raised regarding its potential to affect amphibian populations. We studied the short-term effects of full and partial livestock grazing exclosures on Rana luteiventris (Columbia Spotted Frog) populations using a controlled manipulative field experiment with pre- and posttreatment data (2002...
Authors
M. J. Adams, Christopher Pearl, Brome McCreary, Stephanie Galvan, Stephanie J. Wessell, Wendy Wente, Chauncey W. Anderson, Allison B. Kuehl
Widespread occurrence of the chytrid fungus batrachochytrium dendrobatidis on oregon spotted frogs (rana pretiosa) Widespread occurrence of the chytrid fungus batrachochytrium dendrobatidis on oregon spotted frogs (rana pretiosa)
The pathogen Batrachochytrium dendrobatidis (Bd) has been associated with amphibian declines in multiple continents, including western North America. We investigated Bd prevalence in Oregon spotted frog (Rana pretiosa), a species that has declined across its range in the Pacific Northwest. Polymerase chain reaction analysis of skin swabs indicated that Bd was prevalent within populations...
Authors
C.A. Pearl, J. Bowerman, M.J. Adams, N.D. Chelgren
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: 19
No Result Found
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.
Filter Total Items: 68
Surveys for presence of Oregon spotted frog (Rana pretiosa): background information and field methods Surveys for presence of Oregon spotted frog (Rana pretiosa): background information and field methods
The Oregon spotted frog (Rana pretiosa) is the most aquatic of the native frogs in the Pacific Northwest. The common name derives from the pattern of black, ragged-edged spots set against a brown or red ground color on the dorsum of adult frogs. Oregon spotted frogs are generally associated with wetland complexes that have several aquatic habitat types and sizeable coverage of emergent...
Authors
Christopher A. Pearl, David Clayton, Lauri Turner
Using occupancy models to understand the distribution of an amphibian pathogen, Batrachochytrium dendrobatidis Using occupancy models to understand the distribution of an amphibian pathogen, Batrachochytrium dendrobatidis
Batrachochytrium dendrobatidis is a fungal pathogen that is receiving attention around the world for its role in amphibian declines. Study of its occurrence patterns is hampered by false negatives: the failure to detect the pathogen when it is present. Occupancy models are a useful but currently underutilized tool for analyzing detection data when the probability of detecting a species...
Authors
M. J. Adams, Nathan Chelgren, David M. Reinitz, Rebecca A. Cole, L.J. Rachowicz, Stephanie Galvan, Brome McCreary, Christopher A. Pearl, Larissa L. Bailey, Jamie B. Bettaso, Evelyn L. Bull, Matthias Leu
An 11 000-year-long record of fire and vegetation history at Beaver Lake, Oregon, central Willamette Valley An 11 000-year-long record of fire and vegetation history at Beaver Lake, Oregon, central Willamette Valley
High-resolution macroscopic charcoal and pollen analysis were used to reconstruct an 11??000-year-long record of fire and vegetation history from Beaver Lake, Oregon, the first complete Holocene paleoecological record from the floor of the Willamette Valley. In the early Holocene (ca 11??000-7500 calendar years before present [cal??yr??BP]), warmer, drier summers than at present led to...
Authors
Megan K. Walsh, Christopher A. Pearl, Cathy Whitlock, Patrick J. Bartlein, Marc A. Worona
The effects of simulated solar UVB radiation on early developmental stages of the Northwestern Salamander (Ambystoma gracile) from three lakes The effects of simulated solar UVB radiation on early developmental stages of the Northwestern Salamander (Ambystoma gracile) from three lakes
Solar ultraviolet radiation (UV) has received much attention as a factor that could play a role in amphibian population declines. UV can be hazardous to some amphibians, but the resultant effects depend on a variety of environmental and behavioral factors. In this study, the potential effects of UV on the Northwestern Salamander, Ambystoma gracile, from three lakes were assessed in the...
Authors
Robin D. Calfee, Edward E. Little, Christopher A. Pearl, Robert L. Hoffman
Short-term effect of cattle exclosures on Columbia Spotted Frog (Rana luteiventris) populations and habitat in northeastern Oregon Short-term effect of cattle exclosures on Columbia Spotted Frog (Rana luteiventris) populations and habitat in northeastern Oregon
Livestock grazing is a common land use across the western United States, but concerns have been raised regarding its potential to affect amphibian populations. We studied the short-term effects of full and partial livestock grazing exclosures on Rana luteiventris (Columbia Spotted Frog) populations using a controlled manipulative field experiment with pre- and posttreatment data (2002...
Authors
M. J. Adams, Christopher Pearl, Brome McCreary, Stephanie Galvan, Stephanie J. Wessell, Wendy Wente, Chauncey W. Anderson, Allison B. Kuehl
Widespread occurrence of the chytrid fungus batrachochytrium dendrobatidis on oregon spotted frogs (rana pretiosa) Widespread occurrence of the chytrid fungus batrachochytrium dendrobatidis on oregon spotted frogs (rana pretiosa)
The pathogen Batrachochytrium dendrobatidis (Bd) has been associated with amphibian declines in multiple continents, including western North America. We investigated Bd prevalence in Oregon spotted frog (Rana pretiosa), a species that has declined across its range in the Pacific Northwest. Polymerase chain reaction analysis of skin swabs indicated that Bd was prevalent within populations...
Authors
C.A. Pearl, J. Bowerman, M.J. Adams, N.D. Chelgren
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: 19
No Result Found