Scale and Sensitivity of Songbird Occurrence to Landscape Structure in a Harvested Boreal Forest

Avian Conservation and Ecology

Philip D Taylor,¹  Meg A Krawchuk,² 

[1] Acadia University;University of Alberta

关键词: boreal;    conservation;    distribution;    generalized linear mixed-effects models;    l;    scape context;    songbirds;   

DOI  :  10.5751/ACE-00034-010105

学科分类：社会科学、人文和艺术（综合）

来源: Resilience Alliance Publications

【 摘 要 】

To explore the spatial scales at which boreal forest birds respond to landscape structure and how those responses are influenced by forest harvest, we quantified the relationship between amounts of forest in the landscape at multiple spatial scales and the occurrence of 11 common boreal songbirds in western Newfoundland. The habitat type was assessed at a local scale (25 m diameter area) and amounts of forest habitat were measured at neighborhood (300 m) and landscape (2500 m) scales. We further compared how these relationships differed, depending on whether the landscape had been harvested or not, i.e., the landscape context. Landscape-scale metrics were related to occurrence for 7 of 11 species. For five of these seven, landscape context was also important. Landscape context was not important in models that did not contain a landscape-scale term. In four of five of the models including landscape context, there was an interaction of the term with either landscape or neighborhood effects, indicating that, not only was there an effect of forest harvest at the broad scale, but that effect altered the response of the species to other metrics. For the majority of species, overall occurrence tended to be higher in natural than in harvested landscapes, especially at higher levels of forest cover. Interestingly, for some species, occurrence was relatively similar across levels of forest cover within harvested, but not natural, landscapes. The results suggest some scale-invariance in species

【 授权许可】

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