Landscape heterogeneity and marine subsidy generate extensive intrapopulation niche diversity in a large terrestrial vertebrate

The Journal of Animal Ecology
Chris T DarimontThomas E Reimchen

Abstract

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 and primarily terrestrial, and primarily marine, niches respectively. Within these biogeographical subpopulations, social groups also diverged in niche. 4. To support examination at the individual level, we used an isotopic approach to test Van Valen's (1965) niche variation hypothesis. Consistent with the hypothesis, we observed that among-individual variation increased with subpopulation niche width. 5. Patterns at all levels related to how a spatially heteroge...Continue Reading

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Citations

Nov 4, 2009·Proceedings of the National Academy of Sciences of the United States of America·Justin D YeakelNathaniel J Dominy
Dec 18, 2013·Biology Letters·Márcio S Araújo, Raul Costa-Pereira
Dec 12, 2012·PloS One·Julien CucheroussetFrédéric Santoul
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Oct 14, 2020·Proceedings of the National Academy of Sciences of the United States of America·Philip J Manlick, Jonathan N Pauli
Nov 20, 2020·Ecology and Evolution·Ulises BalzaAndrea Raya Rey

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