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 (Q˙Q˙), it is impossible to asses...
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ftleedsuniv:oai:eprints.whiterose.ac.uk:148016 2023-05-15T13:34:42+02:00 Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: Exploring the effect of warming on nature’s natural knockouts Egginton, S Axelsson, M Crockett, EL O'Brien, KM Farrell, AP 2019-10-11 text https://eprints.whiterose.ac.uk/148016/ https://eprints.whiterose.ac.uk/148016/8/VOR%20coz049.pdf en eng Oxford University Press https://eprints.whiterose.ac.uk/148016/8/VOR%20coz049.pdf Egginton, S orcid.org/0000-0002-3084-9692 , Axelsson, M, Crockett, EL et al. (2 more authors) (2019) Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: Exploring the effect of warming on nature’s natural knockouts. Conservation Physiology, 7 (1). coz049. ISSN 2051-1434 cc_by_4 CC-BY Article NonPeerReviewed 2019 ftleedsuniv 2023-01-30T22:20:18Z 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 (Q˙Q˙), 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 Q˙Q˙, heart rate (fH), maximum cardiac work (WC) and relative ventricular mass of N. coriiceps at 1°C were comparable to temperate-water teleosts, and acute warming to 4°C increased fH and WC, as expected. In contrast, icefish hearts accommodated a higher maximum stroke volume (VS) and maximum Q˙Q˙ at 1°C, but their unusually large hearts had a lower fH and maximum afterload tolerance than N. coriiceps at 1°C. Furthermore, maximum VS, maximum Q˙Q˙ and fH 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 fH at 4°C. Acutely warming C. aceratus increased maximum Q˙Q˙, while C. rastrospinosus (like N. coriiceps) held at 4°C for 1 week maintained maximum Q˙Q˙ 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. Article in Journal/Newspaper Antarc* Antarctic Icefish White Rose Research Online (Universities of Leeds, Sheffield & York) Antarctic |
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Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
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 (Q˙Q˙), 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 Q˙Q˙, heart rate (fH), maximum cardiac work (WC) and relative ventricular mass of N. coriiceps at 1°C were comparable to temperate-water teleosts, and acute warming to 4°C increased fH and WC, as expected. In contrast, icefish hearts accommodated a higher maximum stroke volume (VS) and maximum Q˙Q˙ at 1°C, but their unusually large hearts had a lower fH and maximum afterload tolerance than N. coriiceps at 1°C. Furthermore, maximum VS, maximum Q˙Q˙ and fH 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 fH at 4°C. Acutely warming C. aceratus increased maximum Q˙Q˙, while C. rastrospinosus (like N. coriiceps) held at 4°C for 1 week maintained maximum Q˙Q˙ 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 |
Article in Journal/Newspaper |
author |
Egginton, S Axelsson, M Crockett, EL O'Brien, KM Farrell, AP |
spellingShingle |
Egginton, S Axelsson, M Crockett, EL O'Brien, KM Farrell, AP Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: Exploring the effect of warming on nature’s natural knockouts |
author_facet |
Egginton, S Axelsson, M Crockett, EL O'Brien, KM Farrell, AP |
author_sort |
Egginton, S |
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 |
https://eprints.whiterose.ac.uk/148016/ https://eprints.whiterose.ac.uk/148016/8/VOR%20coz049.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Icefish |
genre_facet |
Antarc* Antarctic Icefish |
op_relation |
https://eprints.whiterose.ac.uk/148016/8/VOR%20coz049.pdf Egginton, S orcid.org/0000-0002-3084-9692 , Axelsson, M, Crockett, EL et al. (2 more authors) (2019) Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: Exploring the effect of warming on nature’s natural knockouts. Conservation Physiology, 7 (1). coz049. ISSN 2051-1434 |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
_version_ |
1766056462719647744 |