Inducible heat tolerance in Antarctic notothenioid fishes |
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Authors: | Jason E Podrabsky George N Somero |
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Institution: | (1) Department of Biology, Portland State University, Portland, OR 97207, USA;(2) Hopkins Marine Station, Stanford University, Pacific Grove, CA 93950, USA |
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Abstract: | Significant increases in heat tolerance (time of survival at 14°C) were observed for some, but not all, species of notothenioid fishes collected from McMurdo Sound, Antarctica (77°51′S) following acclimation to 4°C. The increase in thermal tolerance was rapid in Trematomus bernacchii, developing within 1–2 days of acclimation to 4°C. Long-term (6–8 weeks) acclimation to 4°C led to greater heat tolerance in Trematomus pennellii than in T. bernacchii. Unlike its demersal congeners, the cryopelagic notothenioid Pagothenia borchgrevinki did not increase heat tolerance during warm acclimation. A deep-living zoarcid fish, Lycodichthys dearborni, also failed to increase heat tolerance, but survived significantly (> threefold) longer at 14°C than the notothenioids. |
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