Local conditions drive interpopulation variation in field-based critical thermal maximum of brook trout.

ABSTRACT: Individual- and population-level responses to thermal change will be pivotal for species' resilience and adaptive responses to climate change. Thermal tolerance of ectotherms has been extensively studied under laboratory conditions, but comparatively few studies have assessed intra- and interpopulation variation under natural conditions or in situ. We measured field critical thermal maximum (CT_max) of brook trout (Salvelinus fontinalis) populations at twenty sites across Ontario, Canada, to assess their thermal tolerance in situ and examine potential factors underlying intraspecific variation in thermal performance. We modelled CT_max as a function of acclimation using short-term stream temperature data to assess interpopulation variation, and used

SUBMITTER: Stewart EMC 

PROVIDER: S-EPMC11959187 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature