| infestation of northern spotted owls by hippoboscid (diptera) flies in northwestern california. | hippoboscid flies were found on 62 (17%) of 382 northern spotted owls (strix occidentalis caurina) captured between april and september, 1986 through 1990. two species of hippoboscids were identified: icosta americana and ornithomya anchineuria. male and female adult spotted owls had similar prevalences and relative densities of hippoboscid flies. juvenile owls had lower prevalence and relative densities than adults. there were no significant differences in mean intensity of hippoboscids on adul ... | 1993 | 8487378 |
| genetic structure, introgression, and a narrow hybrid zone between northern and california spotted owls (strix occidentalis). | the northern spotted owl (strix occidentalis caurina) is a threatened subspecies and the california spotted owl (strix occidentalis occidentalis) is a subspecies of special concern in the western united states. concern for their continued viability has arisen because of habitat loss caused by timber harvesting. the taxonomic status of the northern subspecies has been the subject of continuing controversy. we investigated the phylogeographical and population genetic structure of northern and cali ... | 2005 | 15773939 |
| multistate models reveal long-term trends of northern spotted owls in the absence of a novel competitor. | quantifying spatial and temporal variability in population trends is a critical aspect of successful management of imperiled species. we evaluated territory occupancy dynamics of northern spotted owls (strix occidentalis caurina), california, usa, 1990-2014. the study area possessed two unique aspects. first, timber management has occurred for over 100 years, resulting in dramatically different forest successional and structural conditions compared to other areas. second, the barred owl (strix v ... | 2016 | 27065016 |
| evaluating areas of high conservation value in western oregon with a decision-support model. | the northwest forest plan was implemented in 1994 to protect habitat for species associated with old-growth forests, including northern spotted owls (strix occidentailis caurina) in washington, oregon, and northern california (u.s.a.). nevertheless, 10-year monitoring data indicate mixed success in meeting the ecological goals of the plan. we used the ecosystem management decision-support model to evaluate terrestrial and aquatic habitats across the landscape on the basis of ecological objective ... | 2010 | 20184658 |