Associations between metabolic traits and growth rate in brown trout (Salmo trutta) depend on thermal regime.

ABSTRACT: Metabolism defines the energetic cost of life, yet we still know relatively little about why intraspecific variation in metabolic rate arises and persists. Spatio-temporal variation in selection potentially maintains differences, but relationships between metabolic traits (standard metabolic rate (SMR), maximum metabolic rate (MMR), and aerobic scope) and fitness across contexts are unresolved. We show that associations between SMR, MMR, and growth rate (a key fitness-related trait) vary depending on the thermal regime (a potential selective agent) in offspring of wild-sampled brown trout from two populations reared for approximately 15 months in either a cool or warm (+1.8°C) regime. SMR was positively related to growth in the cool, but negatively related in the warm regime. The opposite

SUBMITTER: Archer LC 

PROVIDER: S-EPMC8441116 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature