Social and Behavioral Sciences Commons^™

Landscape Heterogeneity And Marine Subsidy Generate Extensive Intrapopulation Niche Diversity In A Large Terrestrial Vertebrate, Chris T. Darimont, Paul C. Paquet, Thomas E. Reimchen

Population Distribution and Habitat Collection

1 Inquiries into niche variation within populations typically focus on proximate ecological causes such as competition. Here we examine how landscape heterogeneity and allochthonous (marine) subsidy might ultimately generate intrapopulation niche diversity.

2 Using stable isotope analysis, we detected extensive terrestrial–marine isotopic niche variation among subpopulations, social groups, and individual grey wolves (Canis lupus) that occupy a spatially heterogeneous landscape in coastal British Columbia comprising a mainland area and adjacent archipelago.

3 The inner island subpopulation exhibited the widest isotopic niche in the population, consuming extensive terrestrial and marine resources. Mainland and outer island subpopulations occupied comparatively narrow …