Use, interpretation, and implications of demographic analyses of northern spotted owl populations

Demographic analyses of Northern Spotted Owl (Strix occidentalis caurina) populations have generated much discussion and debate among scientists, conservationists, managers, and representatives of the timber industry (Gutierrez et al. this volume). The results of these analyses appear clear: populations of territorial adult female Northern Spotted Owls have been in decline for the past 8-l0 years, and the rate of decline is accelerating (Burnham et al. this volume). Debate, however, has focused on at least three topics: (1) analysis and interpretation of results (reliability of the data, analytical techniques involved, potential biases, and, interpretation of the results); (2) the relationship between demography and habitat alteration; and (3) given the results of this research, the implications for land management. Our objectives are to discuss the uses and limitations of demographic data for the management of spotted owl populations, provide additional interpretations of the spotted owl demographic data from a management perspective, and make recommendations for additional analyses and future monitoring efforts. We also will attempt to link inferences from demographic analyses to habitat management.

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