Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina
In ectotherms living in cold waters, locomotory performance is constrained by a slower generation of the ATP that is needed to fuel muscle contraction. Both polar and temperate pteropods of the genus Clione , however, are able to swim continuously by flapping their parapodia (wings) at comparable fr...
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fthighwire:oai:open-archive.highwire.org:jexbio:jeb.070607v1 2023-05-15T13:52:24+02:00 Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina Dymowska, Agnieszka K. Manfredi, Thomas Rosenthal, Joshua J. C. Seibel, Brad A. 2012-06-12 06:29:38.0 text/html http://jeb.biologists.org/cgi/content/short/jeb.070607v1 https://doi.org/10.1242/jeb.070607 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/jeb.070607v1 http://dx.doi.org/10.1242/jeb.070607 Copyright (C) 2012, Company of Biologists Research Article TEXT 2012 fthighwire https://doi.org/10.1242/jeb.070607 2015-02-28T14:04:22Z In ectotherms living in cold waters, locomotory performance is constrained by a slower generation of the ATP that is needed to fuel muscle contraction. Both polar and temperate pteropods of the genus Clione , however, are able to swim continuously by flapping their parapodia (wings) at comparable frequencies, despite the latitudinal temperature gradient. Therefore, we expected polar species to have increased aerobic capacities in their wing muscles. We investigated muscle and mitochondrial ultrastructure of Clione antarctica from the Southern Ocean (-1.8ºC) and populations of a sister species, Clione limacina , from the Arctic (-0.5-3ºC) and from the N. Atlantic (10ºC). We also measured oxygen consumption and the activity of the mitochondrial enzyme citrate synthase (CS), in isolated wings of the two species. The Antarctic species showed a substantial up-regulation of the density of oxidative muscle fibers, but at the expense of fast-twitch muscle fibers. Mitochondrial capacity was also substantially increased in the Antarctic species, with the cristae surface density (58.2±1.3 µm2/µm3) more than twice that found in temperate species (34.3±0.8 µm2/µm3). Arctic C. limacina was intermediate between these two populations (43.7±0.5 µm2/µm3). The values for cold adapted populations are on par with those found in high-performance vertebrates. As a result of oxidative muscle proliferation, CS activity was 4-fold greater in C. antarctica wings than in temperate C. limacina when measured at a common temperature (20°C). Oxygen consumption of isolated wing preparations was comparable in the two species when measured at their respective habitat temperatures. These findings indicate complete compensation of ATP generation in wing muscles across a 10°C temperature range, which supports similar wing-beat frequencies during locomotion at each species' respective temperature. The elevated capacity in the wing muscles is reflected in whole-animal oxygen consumption and feeding rates. Text Antarc* Antarctic Antarctica Arctic Clione limacina Southern Ocean HighWire Press (Stanford University) Antarctic Arctic Southern Ocean The Antarctic Journal of Experimental Biology |
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English |
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Research Article Dymowska, Agnieszka K. Manfredi, Thomas Rosenthal, Joshua J. C. Seibel, Brad A. Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina |
topic_facet |
Research Article |
description |
In ectotherms living in cold waters, locomotory performance is constrained by a slower generation of the ATP that is needed to fuel muscle contraction. Both polar and temperate pteropods of the genus Clione , however, are able to swim continuously by flapping their parapodia (wings) at comparable frequencies, despite the latitudinal temperature gradient. Therefore, we expected polar species to have increased aerobic capacities in their wing muscles. We investigated muscle and mitochondrial ultrastructure of Clione antarctica from the Southern Ocean (-1.8ºC) and populations of a sister species, Clione limacina , from the Arctic (-0.5-3ºC) and from the N. Atlantic (10ºC). We also measured oxygen consumption and the activity of the mitochondrial enzyme citrate synthase (CS), in isolated wings of the two species. The Antarctic species showed a substantial up-regulation of the density of oxidative muscle fibers, but at the expense of fast-twitch muscle fibers. Mitochondrial capacity was also substantially increased in the Antarctic species, with the cristae surface density (58.2±1.3 µm2/µm3) more than twice that found in temperate species (34.3±0.8 µm2/µm3). Arctic C. limacina was intermediate between these two populations (43.7±0.5 µm2/µm3). The values for cold adapted populations are on par with those found in high-performance vertebrates. As a result of oxidative muscle proliferation, CS activity was 4-fold greater in C. antarctica wings than in temperate C. limacina when measured at a common temperature (20°C). Oxygen consumption of isolated wing preparations was comparable in the two species when measured at their respective habitat temperatures. These findings indicate complete compensation of ATP generation in wing muscles across a 10°C temperature range, which supports similar wing-beat frequencies during locomotion at each species' respective temperature. The elevated capacity in the wing muscles is reflected in whole-animal oxygen consumption and feeding rates. |
format |
Text |
author |
Dymowska, Agnieszka K. Manfredi, Thomas Rosenthal, Joshua J. C. Seibel, Brad A. |
author_facet |
Dymowska, Agnieszka K. Manfredi, Thomas Rosenthal, Joshua J. C. Seibel, Brad A. |
author_sort |
Dymowska, Agnieszka K. |
title |
Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina |
title_short |
Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina |
title_full |
Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina |
title_fullStr |
Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina |
title_full_unstemmed |
Temperature compensation of aerobic capacity and performance in the Antarctic pteropod, Clione antarctica, compared to its northern congener, C. limacina |
title_sort |
temperature compensation of aerobic capacity and performance in the antarctic pteropod, clione antarctica, compared to its northern congener, c. limacina |
publisher |
Company of Biologists |
publishDate |
2012 |
url |
http://jeb.biologists.org/cgi/content/short/jeb.070607v1 https://doi.org/10.1242/jeb.070607 |
geographic |
Antarctic Arctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Arctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Arctic Clione limacina Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Arctic Clione limacina Southern Ocean |
op_relation |
http://jeb.biologists.org/cgi/content/short/jeb.070607v1 http://dx.doi.org/10.1242/jeb.070607 |
op_rights |
Copyright (C) 2012, Company of Biologists |
op_doi |
https://doi.org/10.1242/jeb.070607 |
container_title |
Journal of Experimental Biology |
_version_ |
1766256687191162880 |