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

Critical thermal maximum (CTmax) 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...

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Bibliographic Details
Published in:Journal of fish biology 2024-03, Vol.104 (3), p.901-905
Main Authors: Lechner, Emily R., Stewart, Erin M. C., Wilson, Chris C., Raby, Graham D.
Format: Article
Language:English
Subjects:
Acclimation
Acclimatization
Animal embryos
brook trout
climate change
critical thermal maximum
early ontogeny
Embryos
Fish
Freshwater plants
Juveniles
Salmonids
Salvelinus fontinalis
Temperature tolerance
Thermal stress
thermal tolerance
Trout
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Summary:Critical thermal maximum (CTmax) 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 CTmax in embryos incubated under three thermal regimes. Warm acclimation was associated with an increase in embryonic upper thermal tolerance. However, CTmax variability was markedly higher than is typical for juvenile or adult salmonids.
ISSN:0022-1112
1095-8649
DOI:10.1111/jfb.15624