Resource selection varies with resource availability, predation risk, as well as inter- and intra-specific interactions. We investigated effects of demography on resource selection by martens (Martes sp.) on northern Kuiu Island in Southeast Alaska. Using demographic metrics, radiotelemetry, and measures of habitat availability we developed resource and latent selection functions for martens. Concurrently, we estimated abundance of small mammals and calculated the proportions of dietary biomass consumed by martens (during the fall) with stable carbon and nitrogen isotopes. Our investigation revealed that martens on Kuiu Island preferred habitat with closed-canopy old-growth forest (as estimated by Interferometric Synthetic Aperture Radar difference; IfSAR) in areas with higher densities of salmon streams and nearer to the coast. We found that juveniles consumed the highest proportion of salmon and used habitat with higher stream densities than adults. In contrast, adult females consumed the lowest proportion of salmon and used habitat further from the coast with lower densities of salmon streams. In 2011, the year with highest abundance and proportion of juveniles, all martens used habitats with higher densities of salmon streams and consumed more salmon than in other years. Thus, we demonstrate that demography should be considered when conducting resource selection analyses to correctly interpret findings and develop sound management decisions.
|Commitee:||Albeke, Shannon E., Goheen, Jacob R.|
|School:||University of Wyoming|
|Department:||Zoology and Physiology|
|School Location:||United States -- Wyoming|
|Source:||MAI 56/02M(E), Masters Abstracts International|
|Keywords:||Demography, Kuiu Island, Martes americana, Martes caurina, Resource selection, Stable isotopes|
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