Heat hardening in Antarctic notothenioid fishes
Many ectotherms rapidly acquire a short-lived increase in heat tolerance following a heat shock. This capacity to heat harden has been noted in a number of temperate fishes, but it is unknown whether it can also be found among the stenothermal Antarctic notothenioid fishes. To investigate, specimens...
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| Veröffentlicht in: | Polar biology 2012-09, Vol.35 (9), p.1447-1451 |
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| creator | Bilyk, Kevin T. Evans, Clive W. DeVries, Arthur L. |
| description | Many ectotherms rapidly acquire a short-lived increase in heat tolerance following a heat shock. This capacity to heat harden has been noted in a number of temperate fishes, but it is unknown whether it can also be found among the stenothermal Antarctic notothenioid fishes. To investigate, specimens of six notothenioid species were first brought to their critical thermal maxima (CTMax), and then following a recovery period of 4–24 h, a second CTMax was determined for each species to test for an increase in heat tolerance. All six species showed a significant increase over their initial CTMaxs, providing evidence for the existence of heat hardening in notothenioids. The magnitude of this increase ranged from 0.6 ± 0.29 to 1.8 °C ± 0.45, comparable to previously reported values from several temperate fishes and amphibians. This suggests that the heat hardening of Antarctic notothenioids remains undiminished despite their limited heat tolerance and provides further evidence that these fishes retain plasticity in their responses to heat despite their historical residence in a constant cold environment. |
| doi_str_mv | 10.1007/s00300-012-1189-0 |
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This capacity to heat harden has been noted in a number of temperate fishes, but it is unknown whether it can also be found among the stenothermal Antarctic notothenioid fishes. To investigate, specimens of six notothenioid species were first brought to their critical thermal maxima (CTMax), and then following a recovery period of 4–24 h, a second CTMax was determined for each species to test for an increase in heat tolerance. All six species showed a significant increase over their initial CTMaxs, providing evidence for the existence of heat hardening in notothenioids. The magnitude of this increase ranged from 0.6 ± 0.29 to 1.8 °C ± 0.45, comparable to previously reported values from several temperate fishes and amphibians. This suggests that the heat hardening of Antarctic notothenioids remains undiminished despite their limited heat tolerance and provides further evidence that these fishes retain plasticity in their responses to heat despite their historical residence in a constant cold environment.</description><identifier>ISSN: 0722-4060</identifier><identifier>EISSN: 1432-2056</identifier><identifier>DOI: 10.1007/s00300-012-1189-0</identifier><identifier>CODEN: POBIDP</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer-Verlag</publisher><subject>Agnatha. Pisces ; Amphibians ; Animal and plant ecology ; Animal, plant and microbial ecology ; Animals ; Autoecology ; Biological and medical sciences ; Biomedical and Life Sciences ; Climate change ; Ecology ; Fish ; Fishes ; Fundamental and applied biological sciences. Psychology ; Heat ; Heat tolerance ; Life Sciences ; Microbiology ; Morphology ; Oceanography ; Plant Sciences ; Short Note ; Thermoregulation. Hibernation. 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This capacity to heat harden has been noted in a number of temperate fishes, but it is unknown whether it can also be found among the stenothermal Antarctic notothenioid fishes. To investigate, specimens of six notothenioid species were first brought to their critical thermal maxima (CTMax), and then following a recovery period of 4–24 h, a second CTMax was determined for each species to test for an increase in heat tolerance. All six species showed a significant increase over their initial CTMaxs, providing evidence for the existence of heat hardening in notothenioids. The magnitude of this increase ranged from 0.6 ± 0.29 to 1.8 °C ± 0.45, comparable to previously reported values from several temperate fishes and amphibians. This suggests that the heat hardening of Antarctic notothenioids remains undiminished despite their limited heat tolerance and provides further evidence that these fishes retain plasticity in their responses to heat despite their historical residence in a constant cold environment.</description><subject>Agnatha. Pisces</subject><subject>Amphibians</subject><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Animals</subject><subject>Autoecology</subject><subject>Biological and medical sciences</subject><subject>Biomedical and Life Sciences</subject><subject>Climate change</subject><subject>Ecology</subject><subject>Fish</subject><subject>Fishes</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Heat</subject><subject>Heat tolerance</subject><subject>Life Sciences</subject><subject>Microbiology</subject><subject>Morphology</subject><subject>Oceanography</subject><subject>Plant Sciences</subject><subject>Short Note</subject><subject>Thermoregulation. Hibernation. Estivation. 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This capacity to heat harden has been noted in a number of temperate fishes, but it is unknown whether it can also be found among the stenothermal Antarctic notothenioid fishes. To investigate, specimens of six notothenioid species were first brought to their critical thermal maxima (CTMax), and then following a recovery period of 4–24 h, a second CTMax was determined for each species to test for an increase in heat tolerance. All six species showed a significant increase over their initial CTMaxs, providing evidence for the existence of heat hardening in notothenioids. The magnitude of this increase ranged from 0.6 ± 0.29 to 1.8 °C ± 0.45, comparable to previously reported values from several temperate fishes and amphibians. 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| subjects | Agnatha. Pisces Amphibians Animal and plant ecology Animal, plant and microbial ecology Animals Autoecology Biological and medical sciences Biomedical and Life Sciences Climate change Ecology Fish Fishes Fundamental and applied biological sciences. Psychology Heat Heat tolerance Life Sciences Microbiology Morphology Oceanography Plant Sciences Short Note Thermoregulation. Hibernation. Estivation. Ecophysiology and environmental effects Vertebrata Vertebrates: anatomy and physiology, studies on body, several organs or systems Zoology |
| title | Heat hardening in Antarctic notothenioid fishes |
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