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• W2100830608 abstract "research on spotted owls (Strix occidentalis) has increased dramatically in the last decade, factors influencing owl reproduction still are poorly known. This ongoing study uses 9 years of demographic data to analyze associations between owl reproduction and weather, cone crop abundance, and nest-site structure. Initial results indicate no correlation between cone crop abundance and owl reproduction, but significant associations between owl reproductive success and spring weather conditions and nest- site structure. The management of many western forests has been directly influenced by legal and biological requirements for maintaining viable populations of the spotted owl (Strix occidentalis). Although most of the controversy has focused on protecting the old-growth habitat associated with the owl, the long-term viability of the species will also depend on its reproductive success. It has been difficult to assess owl population trends because owls disperse over large areas, and demographic studies rarely have a closed population in which a thorough, long- term census has been done. In the absence of better demographic data, identifying factors that may influence reproduction can be an important tool for inferring population response to changing environmental conditions. Several studies of the spotted owl have inferred that habitat quality, prey abundance, and weather are likely influences on reproduction (Franklin and others 2000, Thomas and others 1990, Zabel and others 1996). Reproduction by the northern spotted owl (S. occidentalis caurina) may be negatively correlated with current winter precipitation (Wagner and others 1996, Zabel et al 1996). In the San Bernardino Mountains of southern California, however, reproduction by the California spotted owl (S. occidentalis occidentalis) was shown to be positively correlated with rainfall during the preceding winter (LaHaye and others 1997). Spotted owls in the San Bernardino Mountains are part of a southern California subpopulation, geographically isolated from a larger subpopulation in the Sierra Nevada of California, and with a diet largely dependent on woodrats (Neotema sp.). This contrasts with most other populations of spotted owls, for which northern flying squirrels (Glaucomys sabrinus) dominate diets, especially in conifer forests. Our objectives in this study are to assess the possible relations between weather conditions and California spotted owl reproduction, to look for nest-site attributes correlated with reproductive success, and to characterize nest-site structure for owls in the southern Sierra Nevada (North and others 2000)." @default.
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• W2100830608 date "2002-01-01" @default.
• W2100830608 modified "2023-09-27" @default.
• W2100830608 title "Environmental factors associated with spotted owl reproduction" @default.
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