Influence of local and landscape factors on distributional dynamics: a species-centred, fitness-based approach
AuthorFlesch, Aaron D.
AffiliationUniv Arizona, Sch Nat Resources & Environm, Desert Lab
MetadataShow full item record
CitationInfluence of local and landscape factors on distributional dynamics: a species-centred, fitness-based approach 2017, 284 (1858):20171001 Proceedings of the Royal Society B: Biological Sciences
Rights© 2017 The Author(s) Published by the Royal Society. All rights reserved.
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AbstractIn spatially structured populations, distributional dynamics are driven by the quantity, connectivity and quality of habitat. Because these drivers are rarely measured directly and simultaneously at relevant scales, information on their relative importance remains unclear. I assessed the influence of both direct and indirect measures of local habitat quality, and of landscape habitat amount and connectivity on long-term territory occupancy dynamics of non-migratory pygmy owls. Direct measures of local habitat quality based on territory-specific reproductive output had greater effects on distribution than landscape factors, but only when spatio-temporal fluxes in performance linked to environmental stochasticity and intraspecific competition were considered. When habitat quality was measured indirectly based on habitat structure, however, landscape factors had greater effects. Although all landscape factors were important, measures of landscape connectivity that were uncorrelated with habitat amount and based on attributes of matrix structure and habitat configuration that influence dispersal movements had greater effects than habitat effective area (amount weighted by quality). Moreover, the influence of connectivity (but not habitat effective area) depended on local habitat quality. Such results suggest the relative importance of local habitat quality in driving distribution has been underestimated and that conservation strategies should vary spatially depending on both local and landscape contexts.
Note12 month embargo; Published online: 5 July 2017.
VersionFinal accepted manuscript
SponsorsNational Park Service; Tucson Audubon Society; TE Inc.; Defenders of Wildlife; Center for Biological Diversity; US Fish and Wildlife Service; Sonoran Joint Venture; Arizona Zoological Society; Sierra Club