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Phenological shifts in North American red squirrels: disentangling the roles of phenotypic plasticity and microevolution.
Lane, Jeffrey E; McAdam, Andrew G; McFarlane, S Eryn; Williams, Cory T; Humphries, Murray M; Coltman, David W; Gorrell, Jamieson C; Boutin, Stan.
Afiliação
  • Lane JE; Biology, University of Saskatchewan, Saskatoon, SK, Canada.
  • McAdam AG; Integrative Biology, University of Guelph, Guelph, ON, Canada.
  • McFarlane SE; Ecology and Genetics, Uppsala Universitet Biologiska Sektionen, Uppsala, Sweden.
  • Williams CT; Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, USA.
  • Humphries MM; Natural Resource Sciences, McGill, Ste-Anne de Bellevue, QC, Canada.
  • Coltman DW; Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada.
  • Gorrell JC; Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada.
  • Boutin S; Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada.
J Evol Biol ; 31(6): 810-821, 2018 06.
Article em En | MEDLINE | ID: mdl-29518280
ABSTRACT
Phenological shifts are the most widely reported ecological responses to climate change, but the requirements to distinguish their causes (i.e. phenotypic plasticity vs. microevolution) are rarely met. To do so, we analysed almost two decades of parturition data from a wild population of North American red squirrels (Tamiasciurus hudsonicus). Although an observed advance in parturition date during the first decade provided putative support for climate change-driven microevolution, a closer look revealed a more complex pattern. Parturition date was heritable [h2  = 0.14 (0.07-0.21 (HPD interval)] and under phenotypic selection [ß = -0.14 ± 0.06 (SE)] across the full study duration. However, the early advance reversed in the second decade. Further, selection did not act on the genetic contribution to variation in parturition date, and observed changes in predicted breeding values did not exceed those expected due to genetic drift. Instead, individuals responded plastically to environmental variation, and high food [white spruce (Picea glauca) seed] production in the first decade appears to have produced a plastic advance. In addition, there was little evidence of climate change affecting the advance, as there was neither a significant influence of spring temperature on parturition date or evidence of a change in spring temperatures across the study duration. Heritable traits not responding to selection in accordance with quantitative genetic predictions have long presented a puzzle to evolutionary ecologists. Our results on red squirrels provide empirical support for one potential solution phenotypic selection arising from an environmental, as opposed to genetic, covariance between the phenotypic trait and annual fitness.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Sciuridae / Adaptação Fisiológica / Evolução Biológica Tipo de estudo: Prognostic_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Sciuridae / Adaptação Fisiológica / Evolução Biológica Tipo de estudo: Prognostic_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Ano de publicação: 2018 Tipo de documento: Article