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CT max in brook trout ( Salvelinus fontinalis ) embryos shows an acclimation response to developmental temperatures but is more variable than in later life stages

2023; Wiley; Volume: 104; Issue: 3 Linguagem: Inglês

10.1111/jfb.15624

1095-8649

Emily Lechner, Erin Stewart, Chris C. Wilson, Graham D. Raby,

Animal Behavior and Reproduction

Abstract Critical thermal maximum (CT max ) is widely used to measure upper thermal tolerance in fish but is rarely examined in embryos. Upper thermal limits generally depend on an individual's thermal history, which molds plasticity. We examined how thermal acclimation affects thermal tolerance of brook trout ( Salvelinus fontinalis ) embryos using a novel method to assess CT max in embryos incubated under three thermal regimes. Warm acclimation was associated with an increase in embryonic upper thermal tolerance. However, CT max variability was markedly higher than is typical for juvenile or adult salmonids.