Selection of both habitat and genes in specialized and endangered caribou

Maria Cavedon, Bridgett vonHoldt, Mark Hebblewhite, Troy Hegel, Elizabeth Heppenheimer, Dave Hervieux, Stefano Mariani, Helen Schwantje, Robin Steenweg, Megan Watters, Marco Musiani

Research output: Contribution to journalArticlepeer-review

Abstract

Genetic mechanisms determining habitat selection and specialization of individuals within species have been hypothesized, but not tested at the appropriate individual level in nature. In this work, we analyzed habitat selection for 139 GPS-collared caribou belonging to 3 declining ecotypes sampled throughout Northwestern Canada. We used Resource Selection Functions comparing resources at used and available locations. We found that the 3 caribou ecotypes differed in their use of habitat suggesting specialization. On expected grounds, we also found differences in habitat selection between summer and winter, but also, originally, among the individuals within an ecotype. We next obtained Single Nucleotide Polymorphisms (SNPs) for the same caribou individuals, we detected those associated to habitat selection, and then identified genes linked to these SNPs. These genes had functions related in other organisms to habitat and dietary specializations, and climatic adaptations. We therefore suggest that individual variation in habitat selection was based on genotypic variation in the SNPs of individual caribou, indicating that genetic forces underlie habitat and diet selection in the species. We also suggest that the associations between habitat and genes that we detected may lead to lack of resilience in the species, thus contributing to caribou endangerment. Our work emphasizes that similar mechanisms may exist for other specialized, endangered species.

Original languageEnglish (US)
Article numbere13900
JournalConservation Biology
Volume36
Issue number4
DOIs
StatePublished - Aug 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

Keywords

  • Resource Selection Functions
  • caribou
  • caribú
  • ecological specialization
  • endangered species
  • especialización ecológica
  • especie en peligro
  • funciones de selección de recursos
  • genomics
  • genómica
  • global positioning systems
  • habitat loss
  • habitat selection
  • pérdida de hábitat
  • selección de hábitat
  • sistemas de posicionamiento global

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