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Full-Text Articles in Life Sciences
Range-Wide Declines Of Northern Spotted Owl Populations In The Pacific Northwest: A Meta-Analysis, Alan B. Franklin, Katie M. Dugger, Damon B. Lesmeister, Raymond J. Davis, J. David Wiens, Gary C. White, James D. Nichols, James E. Hines, Charles B. Yackulic, Carl J. Schwarz, Steven H. Ackers, L. Steven Andrews, Larissa L. Bailey, Robin Bown, Mary M. Conner, Et Al.
Range-Wide Declines Of Northern Spotted Owl Populations In The Pacific Northwest: A Meta-Analysis, Alan B. Franklin, Katie M. Dugger, Damon B. Lesmeister, Raymond J. Davis, J. David Wiens, Gary C. White, James D. Nichols, James E. Hines, Charles B. Yackulic, Carl J. Schwarz, Steven H. Ackers, L. Steven Andrews, Larissa L. Bailey, Robin Bown, Mary M. Conner, Et Al.
Wildland Resources Faculty Publications
The northern spotted owl (Strix occidentalis caurina) inhabits older coniferous forests in the Pacific Northwest and has been at the center of forest management issues in this region. The immediate threats to this federally listed species include habitat loss and competition with barred owls (Strix varia), which invaded from eastern North America. We conducted a prospective meta-analysis to assess population trends and factors affecting those trends in northern spotted owls using 26 years of survey and capture-recapture data from 11 study areas across the owls' geographic range to analyze demographic traits, rates of population change, and …
Anthropogenic Disturbance And Population Viability Of Woodland Caribou In Ontario, John M. Fryxell, Tal Avgar, Boyan Liu, James A. Baker, Arthur R. Rodgers, Jennifer Shuter, Ian D. Thompson, Douglas E. B. Reid, Andrew M. Kittle, Anna Mosser, Steven G. Newmaster, Tom D. Nudds, Garrett M. Street, Glen S. Brown, Brent Patterson
Anthropogenic Disturbance And Population Viability Of Woodland Caribou In Ontario, John M. Fryxell, Tal Avgar, Boyan Liu, James A. Baker, Arthur R. Rodgers, Jennifer Shuter, Ian D. Thompson, Douglas E. B. Reid, Andrew M. Kittle, Anna Mosser, Steven G. Newmaster, Tom D. Nudds, Garrett M. Street, Glen S. Brown, Brent Patterson
Wildland Resources Faculty Publications
One of the most challenging tasks in wildlife conservation and management is to clarify how spatial variation in land cover due to anthropogenic disturbance influences wildlife demography and long‐term viability. To evaluate this, we compared rates of survival and population growth by woodland caribou (Rangifer tarandus caribou) from 2 study sites in northern Ontario, Canada that differed in the degree of anthropogenic disturbance because of commercial logging and road development, resulting in differences in predation risk due to gray wolves (Canis lupus). We used an individual‐based model for population viability analysis (PVA) that incorporated adaptive patterns …
Cross-Fostering As A Conservation Tool To Augment Endangered Carnivore Populations, Eric M. Gese, William T. Waddell, Patricia A. Terletzky, Chris F. Lucash, Scott R. Mclellan, Susan K. Behrns
Cross-Fostering As A Conservation Tool To Augment Endangered Carnivore Populations, Eric M. Gese, William T. Waddell, Patricia A. Terletzky, Chris F. Lucash, Scott R. Mclellan, Susan K. Behrns
Wildland Resources Faculty Publications
Cross-fostering offspring with nonbiological parents could prove useful to augment populations of endangered carnivores. We used cross-fostering to augment captive-born and wild-born litters for the endangered red wolf (Canis rufus). Between 1987 and 2016, 23 cross-fostering events occurred involving captive-born pups fostered into captive litters (n = 8 events) and captive-born pups fostered into wild recipient litters (n = 15 events). Percentage of pups surviving 3 and 12 months was 91.7% for captive-born pups fostered into captive recipient litters. For pups fostered into wild litters, percentage of pups surviving 5 months was > 94% among fostered pups …
Evaluation Of Harvest Indices For Monitoring Cougar Survival And Abundance, Michael L. Wolfe, Eric M. Gese, Patricia A. Terletzky, David C. Stoner, Lise M. Aubry
Evaluation Of Harvest Indices For Monitoring Cougar Survival And Abundance, Michael L. Wolfe, Eric M. Gese, Patricia A. Terletzky, David C. Stoner, Lise M. Aubry
Wildland Resources Faculty Publications
Harvest indices are used by state wildlife management agencies to monitor population trends and set harvest quotas for furbearer species. Although harvest indices may be readily collected from hunters, the reliability of harvest indices for monitoring demography and abundance of the harvested species is rarely examined, particularly amongst large carnivores. The overall objective of this study was to assess whether cougar (Puma concolor) harvest statistics collected by wildlife managers were correlated with changes in cougar demography, mainly survival rates and abundance. We estimated key demographic parameters for 2 cougar populations in Utah over 17 years during which we …
Growth And Survival Of Colorado Squawfish In The Upper Colorado River, D. B. Osmundson, Ronald J. Ryel, T. E. Mourning
Growth And Survival Of Colorado Squawfish In The Upper Colorado River, D. B. Osmundson, Ronald J. Ryel, T. E. Mourning
Wildland Resources Faculty Publications
Growth and adult survival rates were estimated for the endangered Colorado squawfish Ptychocheilus lucius inhabiting the upper Colorado River by using data from fish captured during 1990–1995. Mean annual growth rates of fish aged 3–6 years ranged from 32.2 (age 6) to 82.0 (age 3) mm/year. Growth rates for older fish were highest for fish 400–449 mm total length, TL, (42.7 mm/year) and declined to 19.8 mm/year for fish 500–549 mm TL. Fish 550 mm and longer grew an average 9.5 mm/year. Survival rates for fish 550 mm and longer were estimated by comparing measured size distributions with simulated stable …