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°C year round. This study examined the thermal plasticity of cardiac functio...
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fthighwire:oai:open-archive.highwire.org:jexbio:210/17/3068 2023-05-15T13:57:08+02:00 Antarctic fish can compensate for rising temperatures: thermal acclimation of cardiac performance in Pagothenia borchgrevinki Franklin, Craig E. Davison, William Seebacher, Frank 2007-09-01 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/210/17/3068 https://doi.org/10.1242/jeb.003137 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/210/17/3068 http://dx.doi.org/10.1242/jeb.003137 Copyright (C) 2007, Company of Biologists Research Article TEXT 2007 fthighwire https://doi.org/10.1242/jeb.003137 2015-02-28T18:21:14Z 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°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°C and 4°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°C. In the –1°C acclimated fish, the factorial scope for cardiac output was greatest at –1°C and decreased with increasing temperature. Increases in cardiac output with exercise in the –1°C acclimated fish was achieved by increases in both heart rate and stroke volume. With acclimation to 4°C, resting cardiac output was thermally independent across the test temperatures; furthermore, factorial scope for cardiac output was maintained at 4, 6 and 8°C, demonstrating thermal compensation of cardiac function at the higher temperatures. This was at the expense of cardiac function at –1°C, where there was a significant decrease in factorial scope for cardiac output in the 4°C acclimated fish. Increases in cardiac output with exercise in the 4°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°C acclimated fish at low temperatures to a purely chronotropic modulated heart in the 4°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 ... Text Antarc* Antarctic Antarctica McMurdo Sound Sea ice HighWire Press (Stanford University) Antarctic McMurdo Sound Journal of Experimental Biology 210 17 3068 3074 |
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HighWire Press (Stanford University) |
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English |
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Research Article |
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Research Article Franklin, Craig E. Davison, William Seebacher, Frank Antarctic fish can compensate for rising temperatures: thermal acclimation of cardiac performance in Pagothenia borchgrevinki |
topic_facet |
Research Article |
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°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°C and 4°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°C. In the –1°C acclimated fish, the factorial scope for cardiac output was greatest at –1°C and decreased with increasing temperature. Increases in cardiac output with exercise in the –1°C acclimated fish was achieved by increases in both heart rate and stroke volume. With acclimation to 4°C, resting cardiac output was thermally independent across the test temperatures; furthermore, factorial scope for cardiac output was maintained at 4, 6 and 8°C, demonstrating thermal compensation of cardiac function at the higher temperatures. This was at the expense of cardiac function at –1°C, where there was a significant decrease in factorial scope for cardiac output in the 4°C acclimated fish. Increases in cardiac output with exercise in the 4°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°C acclimated fish at low temperatures to a purely chronotropic modulated heart in the 4°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 ... |
format |
Text |
author |
Franklin, Craig E. Davison, William Seebacher, Frank |
author_facet |
Franklin, Craig E. Davison, William Seebacher, Frank |
author_sort |
Franklin, Craig 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 |
Company of Biologists |
publishDate |
2007 |
url |
http://jeb.biologists.org/cgi/content/short/210/17/3068 https://doi.org/10.1242/jeb.003137 |
geographic |
Antarctic McMurdo Sound |
geographic_facet |
Antarctic McMurdo Sound |
genre |
Antarc* Antarctic Antarctica McMurdo Sound Sea ice |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Sound Sea ice |
op_relation |
http://jeb.biologists.org/cgi/content/short/210/17/3068 http://dx.doi.org/10.1242/jeb.003137 |
op_rights |
Copyright (C) 2007, Company of Biologists |
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 |
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1766264736287031296 |