Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki
Antarctic fish Pagothenia borchgrevinki in McMurdo Sound, Antarctica, inhabit one of the coldest and most thermally stable of all environments. Sea temperatures under the sea ice in this region remain a fairly constant -1.86 degrees C year round. This study examined the thermal plasticity of cardiac...
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The Company of Biologists Ltd
2007
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:130059 2023-05-15T13:48:53+02:00 Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki Franklin, C. E. Davison, W. Seebacher, F. Hoppeler, H. 2007-01-01 https://espace.library.uq.edu.au/view/UQ:130059/UQ130059_OA.pdf https://espace.library.uq.edu.au/view/UQ:130059 eng eng The Company of Biologists Ltd doi:10.1242/jeb.003137 issn:0022-0949 orcid:0000-0003-1315-3797 Biology fish Antarctica cardiac output heart specialist acclimation thermal plasticity chronotropic Perfused Trout Heart Cod Gadus-morhua Rainbow-trout Oncorhynchus-mykiss Water Temperatures Blood-pressure Evolution Responses Exercise Mechanisms 270604 Comparative Physiology C1 771103 Living resources (flora and fauna) Journal Article 2007 ftunivqespace https://doi.org/10.1242/jeb.003137 2020-12-22T02:23:18Z Antarctic fish Pagothenia borchgrevinki in McMurdo Sound, Antarctica, inhabit one of the coldest and most thermally stable of all environments. Sea temperatures under the sea ice in this region remain a fairly constant -1.86 degrees C year round. This study examined the thermal plasticity of cardiac function in P. borchgrevinki to determine whether specialisation to stable low temperatures has led to the loss of the ability to acclimate physiological function. Fish were acclimated to - 1 degrees C and 4 degrees C for 4 - 5 weeks and cardiac output was measured at rest and after exhaustive exercise in fish acutely transferred from their acclimation temperature to - 1, 2, 4, 6 and 8 degrees C. In the - 1 degrees C acclimated fish, the factorial scope for cardiac output was greatest at - 1 degrees C and decreased with increasing temperature. Increases in cardiac output with exercise in the - 1 degrees C acclimated fish was achieved by increases in both heart rate and stroke volume. With acclimation to 4 degrees C, resting cardiac output was thermally independent across the test temperatures; furthermore, factorial scope for cardiac output was maintained at 4, 6 and 8 degrees C, demonstrating thermal compensation of cardiac function at the higher temperatures. This was at the expense of cardiac function at - 1 degrees C, where there was a significant decrease in factorial scope for cardiac output in the 4 degrees C acclimated fish. Increases in cardiac output with exercise in the 4 degrees C acclimated fish at the higher temperatures was achieved by changes in heart rate alone, with stroke volume not varying between rest and exercise. The thermal compensation of cardiac function in P. borchgrevinki at higher temperatures was the result of a change in pumping strategy from a mixed inotropic/chronotropic modulated heart in - 1 degrees C acclimated fish at low temperatures to a purely chronotropic modulated heart in the 4 degrees C acclimated fish at higher temperatures. In spite of living in a highly stenothermal cold environment, P. borchgrevinki demonstrated the capacity to thermally acclimate cardiac function to elevated temperatures, thereby allowing the maintenance of factorial scope and the support of aerobic swimming at higher temperatures. Article in Journal/Newspaper Antarc* Antarctic Antarctica Gadus morhua McMurdo Sound Sea ice The University of Queensland: UQ eSpace Antarctic McMurdo Sound Journal of Experimental Biology 210 17 3068 3074 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Biology fish Antarctica cardiac output heart specialist acclimation thermal plasticity chronotropic Perfused Trout Heart Cod Gadus-morhua Rainbow-trout Oncorhynchus-mykiss Water Temperatures Blood-pressure Evolution Responses Exercise Mechanisms 270604 Comparative Physiology C1 771103 Living resources (flora and fauna) |
spellingShingle |
Biology fish Antarctica cardiac output heart specialist acclimation thermal plasticity chronotropic Perfused Trout Heart Cod Gadus-morhua Rainbow-trout Oncorhynchus-mykiss Water Temperatures Blood-pressure Evolution Responses Exercise Mechanisms 270604 Comparative Physiology C1 771103 Living resources (flora and fauna) Franklin, C. E. Davison, W. Seebacher, F. Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki |
topic_facet |
Biology fish Antarctica cardiac output heart specialist acclimation thermal plasticity chronotropic Perfused Trout Heart Cod Gadus-morhua Rainbow-trout Oncorhynchus-mykiss Water Temperatures Blood-pressure Evolution Responses Exercise Mechanisms 270604 Comparative Physiology C1 771103 Living resources (flora and fauna) |
description |
Antarctic fish Pagothenia borchgrevinki in McMurdo Sound, Antarctica, inhabit one of the coldest and most thermally stable of all environments. Sea temperatures under the sea ice in this region remain a fairly constant -1.86 degrees C year round. This study examined the thermal plasticity of cardiac function in P. borchgrevinki to determine whether specialisation to stable low temperatures has led to the loss of the ability to acclimate physiological function. Fish were acclimated to - 1 degrees C and 4 degrees C for 4 - 5 weeks and cardiac output was measured at rest and after exhaustive exercise in fish acutely transferred from their acclimation temperature to - 1, 2, 4, 6 and 8 degrees C. In the - 1 degrees C acclimated fish, the factorial scope for cardiac output was greatest at - 1 degrees C and decreased with increasing temperature. Increases in cardiac output with exercise in the - 1 degrees C acclimated fish was achieved by increases in both heart rate and stroke volume. With acclimation to 4 degrees C, resting cardiac output was thermally independent across the test temperatures; furthermore, factorial scope for cardiac output was maintained at 4, 6 and 8 degrees C, demonstrating thermal compensation of cardiac function at the higher temperatures. This was at the expense of cardiac function at - 1 degrees C, where there was a significant decrease in factorial scope for cardiac output in the 4 degrees C acclimated fish. Increases in cardiac output with exercise in the 4 degrees C acclimated fish at the higher temperatures was achieved by changes in heart rate alone, with stroke volume not varying between rest and exercise. The thermal compensation of cardiac function in P. borchgrevinki at higher temperatures was the result of a change in pumping strategy from a mixed inotropic/chronotropic modulated heart in - 1 degrees C acclimated fish at low temperatures to a purely chronotropic modulated heart in the 4 degrees C acclimated fish at higher temperatures. In spite of living in a highly stenothermal cold environment, P. borchgrevinki demonstrated the capacity to thermally acclimate cardiac function to elevated temperatures, thereby allowing the maintenance of factorial scope and the support of aerobic swimming at higher temperatures. |
author2 |
Hoppeler, H. |
format |
Article in Journal/Newspaper |
author |
Franklin, C. E. Davison, W. Seebacher, F. |
author_facet |
Franklin, C. E. Davison, W. Seebacher, F. |
author_sort |
Franklin, C. E. |
title |
Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki |
title_short |
Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki |
title_full |
Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki |
title_fullStr |
Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki |
title_full_unstemmed |
Antarctic fish can compensate for rising temperatures: Thermal acclimation of cardiac performance in Pagothenia borchgrevinki |
title_sort |
antarctic fish can compensate for rising temperatures: thermal acclimation of cardiac performance in pagothenia borchgrevinki |
publisher |
The Company of Biologists Ltd |
publishDate |
2007 |
url |
https://espace.library.uq.edu.au/view/UQ:130059/UQ130059_OA.pdf https://espace.library.uq.edu.au/view/UQ:130059 |
geographic |
Antarctic McMurdo Sound |
geographic_facet |
Antarctic McMurdo Sound |
genre |
Antarc* Antarctic Antarctica Gadus morhua McMurdo Sound Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Gadus morhua McMurdo Sound Sea ice |
op_relation |
doi:10.1242/jeb.003137 issn:0022-0949 orcid:0000-0003-1315-3797 |
op_doi |
https://doi.org/10.1242/jeb.003137 |
container_title |
Journal of Experimental Biology |
container_volume |
210 |
container_issue |
17 |
container_start_page |
3068 |
op_container_end_page |
3074 |
_version_ |
1766249919865159680 |