Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts
Antarctic notothenioids, some of which lack myoglobin (Mb) and/or haemoglobin (Hb), are considered extremely stenothermal, which raises conservation concerns since Polar regions are warming at unprecedented rates. Without reliable estimates of maximum cardiac output ([Formula: see text]), it is impo...
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ftpubmed:oai:pubmedcentral.nih.gov:6788497 2023-05-15T13:54:11+02:00 Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts Egginton, Stuart Axelsson, Michael Crockett, Elizabeth L O’Brien, Kristin M Farrell, Anthony P 2019-10-11 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6788497/ https://doi.org/10.1093/conphys/coz049 en eng Oxford University Press http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6788497/ http://dx.doi.org/10.1093/conphys/coz049 © The Author(s) 2019. Published by Oxford University Press. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. CC-BY Research Article Text 2019 ftpubmed https://doi.org/10.1093/conphys/coz049 2019-10-20T00:28:26Z Antarctic notothenioids, some of which lack myoglobin (Mb) and/or haemoglobin (Hb), are considered extremely stenothermal, which raises conservation concerns since Polar regions are warming at unprecedented rates. Without reliable estimates of maximum cardiac output ([Formula: see text]), it is impossible to assess their physiological scope in response to warming seas. Therefore, we compared cardiac performance of two icefish species, Chionodraco rastrospinosus (Hb(−)Mb(+)) and Chaenocephalus aceratus (Hb(−)Mb(−)), with a related notothenioid, Notothenia coriiceps (Hb(+)Mb(+)) using an in situ perfused heart preparation. The maximum [Formula: see text] , heart rate (f(H)), maximum cardiac work (W(C)) and relative ventricular mass of N. coriiceps at 1°C were comparable to temperate-water teleosts, and acute warming to 4°C increased f(H) and W(C), as expected. In contrast, icefish hearts accommodated a higher maximum stroke volume (V(S)) and maximum [Formula: see text] at 1°C, but their unusually large hearts had a lower f(H) and maximum afterload tolerance than N. coriiceps at 1°C. Furthermore, maximum V(S), maximum [Formula: see text] and f(H) were all significantly higher for the Hb(−)Mb(+) condition compared with the Hb(−)Mb(−) condition, a potential selective advantage when coping with environmental warming. Like N. coriiceps, both icefish species increased f(H) at 4°C. Acutely warming C. aceratus increased maximum [Formula: see text] , while C. rastrospinosus (like N. coriiceps) held at 4°C for 1 week maintained maximum [Formula: see text] when tested at 4°C. These experiments involving short-term warming should be followed up with long-term acclimation studies, since the maximum cardiac performance of these three Antarctic species studied seem to be tolerant of temperatures in excess of predictions associated with global warming. Text Antarc* Antarctic Icefish PubMed Central (PMC) Antarctic Conservation Physiology 7 1 |
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Research Article Egginton, Stuart Axelsson, Michael Crockett, Elizabeth L O’Brien, Kristin M Farrell, Anthony P Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts |
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Research Article |
description |
Antarctic notothenioids, some of which lack myoglobin (Mb) and/or haemoglobin (Hb), are considered extremely stenothermal, which raises conservation concerns since Polar regions are warming at unprecedented rates. Without reliable estimates of maximum cardiac output ([Formula: see text]), it is impossible to assess their physiological scope in response to warming seas. Therefore, we compared cardiac performance of two icefish species, Chionodraco rastrospinosus (Hb(−)Mb(+)) and Chaenocephalus aceratus (Hb(−)Mb(−)), with a related notothenioid, Notothenia coriiceps (Hb(+)Mb(+)) using an in situ perfused heart preparation. The maximum [Formula: see text] , heart rate (f(H)), maximum cardiac work (W(C)) and relative ventricular mass of N. coriiceps at 1°C were comparable to temperate-water teleosts, and acute warming to 4°C increased f(H) and W(C), as expected. In contrast, icefish hearts accommodated a higher maximum stroke volume (V(S)) and maximum [Formula: see text] at 1°C, but their unusually large hearts had a lower f(H) and maximum afterload tolerance than N. coriiceps at 1°C. Furthermore, maximum V(S), maximum [Formula: see text] and f(H) were all significantly higher for the Hb(−)Mb(+) condition compared with the Hb(−)Mb(−) condition, a potential selective advantage when coping with environmental warming. Like N. coriiceps, both icefish species increased f(H) at 4°C. Acutely warming C. aceratus increased maximum [Formula: see text] , while C. rastrospinosus (like N. coriiceps) held at 4°C for 1 week maintained maximum [Formula: see text] when tested at 4°C. These experiments involving short-term warming should be followed up with long-term acclimation studies, since the maximum cardiac performance of these three Antarctic species studied seem to be tolerant of temperatures in excess of predictions associated with global warming. |
format |
Text |
author |
Egginton, Stuart Axelsson, Michael Crockett, Elizabeth L O’Brien, Kristin M Farrell, Anthony P |
author_facet |
Egginton, Stuart Axelsson, Michael Crockett, Elizabeth L O’Brien, Kristin M Farrell, Anthony P |
author_sort |
Egginton, Stuart |
title |
Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts |
title_short |
Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts |
title_full |
Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts |
title_fullStr |
Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts |
title_full_unstemmed |
Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts |
title_sort |
maximum cardiac performance of antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature’s natural knockouts |
publisher |
Oxford University Press |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6788497/ https://doi.org/10.1093/conphys/coz049 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Icefish |
genre_facet |
Antarc* Antarctic Icefish |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6788497/ http://dx.doi.org/10.1093/conphys/coz049 |
op_rights |
© The Author(s) 2019. Published by Oxford University Press. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1093/conphys/coz049 |
container_title |
Conservation Physiology |
container_volume |
7 |
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1 |
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1766259873846132736 |