Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature
Abstract: Studies in temperate fishes provide evidence that cardiac mitochondrial function and the capacity to fuel cardiac work contribute to thermal tolerance. Here, we tested the hypothesis that decreased cardiac aerobic metabolic capacity contributes to the lower thermal tolerance of the haemogl...
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IEDA: US Antarctic Program Data Center
2020
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dataone:http://get.iedadata.org/metadata/iso/601405 2024-06-03T18:46:23+00:00 Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature O'Brien, Kristin 2020-12-18T00:00:00Z http://get.iedadata.org/metadata/iso/601405 unknown IEDA: US Antarctic Program Data Center Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) Dataset 2020 dataone:urn:node:IEDA_USAP 2024-06-03T18:17:00Z Abstract: Studies in temperate fishes provide evidence that cardiac mitochondrial function and the capacity to fuel cardiac work contribute to thermal tolerance. Here, we tested the hypothesis that decreased cardiac aerobic metabolic capacity contributes to the lower thermal tolerance of the haemoglobinless Antarctic icefish, Chaenocephalus aceratus, compared with that of the red-blooded Antarctic species, Notothenia coriiceps. Maximal activities of citrate synthase (CS) and lactate dehydrogenase (LDH), respiration rates of isolated mitochondria, adenylate levels and changes in mitochondrial protein expression were quantified from hearts of animals held at ambient temperature or exposed to their critical thermal maximum (CTmax). Compared with C. aceratus, activity of CS, ATP concentration and energy charge were higher in hearts of N. coriiceps at ambient temperature and CTmax While state 3 mitochondrial respiration rates were not impaired by exposure to CTmax in either species, state 4 rates, indicative of proton leakage, increased following exposure to CTmax in C. aceratus but not N. coriiceps The interactive effect of temperature and species resulted in an increase in antioxidants and aerobic metabolic enzymes in N. coriiceps but not in C. aceratus Together, our results support the hypothesis that the lower aerobic metabolic capacity of C. aceratus hearts contributes to its low thermal tolerance. Dataset Antarc* Antarctic Antarctic Peninsula Antarctica Icefish IEDA: US Antarctic Program Data Center (via DataONE) Antarctic Antarctic Peninsula |
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IEDA: US Antarctic Program Data Center (via DataONE) |
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dataone:urn:node:IEDA_USAP |
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Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) |
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Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) O'Brien, Kristin Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature |
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Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) |
description |
Abstract: Studies in temperate fishes provide evidence that cardiac mitochondrial function and the capacity to fuel cardiac work contribute to thermal tolerance. Here, we tested the hypothesis that decreased cardiac aerobic metabolic capacity contributes to the lower thermal tolerance of the haemoglobinless Antarctic icefish, Chaenocephalus aceratus, compared with that of the red-blooded Antarctic species, Notothenia coriiceps. Maximal activities of citrate synthase (CS) and lactate dehydrogenase (LDH), respiration rates of isolated mitochondria, adenylate levels and changes in mitochondrial protein expression were quantified from hearts of animals held at ambient temperature or exposed to their critical thermal maximum (CTmax). Compared with C. aceratus, activity of CS, ATP concentration and energy charge were higher in hearts of N. coriiceps at ambient temperature and CTmax While state 3 mitochondrial respiration rates were not impaired by exposure to CTmax in either species, state 4 rates, indicative of proton leakage, increased following exposure to CTmax in C. aceratus but not N. coriiceps The interactive effect of temperature and species resulted in an increase in antioxidants and aerobic metabolic enzymes in N. coriiceps but not in C. aceratus Together, our results support the hypothesis that the lower aerobic metabolic capacity of C. aceratus hearts contributes to its low thermal tolerance. |
format |
Dataset |
author |
O'Brien, Kristin |
author_facet |
O'Brien, Kristin |
author_sort |
O'Brien, Kristin |
title |
Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature |
title_short |
Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature |
title_full |
Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature |
title_fullStr |
Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature |
title_full_unstemmed |
Cardiac metabolism in Antarctic fishes in response to an acute increase in temperature |
title_sort |
cardiac metabolism in antarctic fishes in response to an acute increase in temperature |
publisher |
IEDA: US Antarctic Program Data Center |
publishDate |
2020 |
url |
http://get.iedadata.org/metadata/iso/601405 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Icefish |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Icefish |
_version_ |
1800871191442882560 |