Evaluating effects of low quality habitats on regional population growth in <Emphasis Type="Italic">Peromyscus leucopus</Emphasis>: Insights
from field-parameterized spatial matrix models |
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Authors: | Jason S Grear Catherine E Burns |
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Institution: | (1) Atlantic Ecology Division, National Health and Environmental Effects Research Laboratory, Office of Research and Development, US Environmental Protection Agency, 27 Tarzwell Dr., Narragansett, RI 02882, USA;(2) Department of Ecology & Evolutionary Biology, Yale University, 165 Prospect St., New Haven, CT 06511, USA |
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Abstract: | Due to complex population dynamics and source–sink metapopulation processes, animal fitness sometimes varies across landscapes
in ways that cannot be deduced from simple density patterns. In this study, we examine spatial patterns in fitness using a
combination of intensive field-based analyses of demography and migration and spatial matrix models of white-footed mouse
(Peromyscus leucopus) population dynamics. We interpret asymptotic population growth rates from these spatial models as fitness-based measures
of habitat-quality and use elasticity analysis to further explore model behavior and the roles of migration. In addition,
we compare population growth rates at the spatial scale of single habitats and the landscape-level scale at which these habitats
are assembled. To this end, we employ emerging techniques in multi-scale estimation of demography and movement and recently
described vec-permutation methods for spatial matrix notation and analysis. Our findings indicate that the loss of low quality
habitats or reductions in movement from these habitats into higher quality areas could negatively affect landscape-level population
fitness. |
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Keywords: | Habitat quality Landscape Spatial Matrix model Peromyscus Population Source Sink White-footed mouse North America USA |
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