Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata
Abstract Although most of the notothenioid fishes have geographic distributions restricted to the Southern Ocean, several species with inferred Antarctic origins have come to permanently inhabit the warmer waters around New Zealand and southern South America. However, it remains unknown whether the...
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crcambridgeupr:10.1017/s0954102011000836 2024-05-12T07:53:22+00:00 Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata Bilyk, Kevin T. Devries, Arthur L. 2011 http://dx.doi.org/10.1017/s0954102011000836 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102011000836 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 24, issue 2, page 165-172 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2011 crcambridgeupr https://doi.org/10.1017/s0954102011000836 2024-04-18T06:54:33Z Abstract Although most of the notothenioid fishes have geographic distributions restricted to the Southern Ocean, several species with inferred Antarctic origins have come to permanently inhabit the warmer waters around New Zealand and southern South America. However, it remains unknown whether the Antarctic ancestry of these secondarily temperate species continues to influence their modern heat tolerance. We investigated the heat tolerance of one such secondarily temperate nototheniid, Notothenia angustata , which is now endemic to the waters around the South Island of New Zealand. Their heat tolerance was determined using the critical thermal maximum (CTMax) both when acclimatized to their winter water temperatures (7.9°C), and warm acclimated (15°C) near the summer water temperatures in Otago Harbour. When compared to equivalently acclimated specimens of the basal New Zealand notothenioid Bovichtus variegatus , N. angustata have consistently lower CTMaxs, though they are significantly greater than those determined from 10°C acclimated specimens of its endemic Antarctic congener, N. coriiceps . While this shows greater heat tolerance in the secondarily temperate N. angustata than in endemic Antarctic species, it also suggests that some of its ancestral intolerance to heat persists. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Southern Ocean Cambridge University Press Antarctic Southern Ocean The Antarctic New Zealand Antarctic Science 24 2 165 172 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Bilyk, Kevin T. Devries, Arthur L. Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Although most of the notothenioid fishes have geographic distributions restricted to the Southern Ocean, several species with inferred Antarctic origins have come to permanently inhabit the warmer waters around New Zealand and southern South America. However, it remains unknown whether the Antarctic ancestry of these secondarily temperate species continues to influence their modern heat tolerance. We investigated the heat tolerance of one such secondarily temperate nototheniid, Notothenia angustata , which is now endemic to the waters around the South Island of New Zealand. Their heat tolerance was determined using the critical thermal maximum (CTMax) both when acclimatized to their winter water temperatures (7.9°C), and warm acclimated (15°C) near the summer water temperatures in Otago Harbour. When compared to equivalently acclimated specimens of the basal New Zealand notothenioid Bovichtus variegatus , N. angustata have consistently lower CTMaxs, though they are significantly greater than those determined from 10°C acclimated specimens of its endemic Antarctic congener, N. coriiceps . While this shows greater heat tolerance in the secondarily temperate N. angustata than in endemic Antarctic species, it also suggests that some of its ancestral intolerance to heat persists. |
format |
Article in Journal/Newspaper |
author |
Bilyk, Kevin T. Devries, Arthur L. |
author_facet |
Bilyk, Kevin T. Devries, Arthur L. |
author_sort |
Bilyk, Kevin T. |
title |
Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata |
title_short |
Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata |
title_full |
Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata |
title_fullStr |
Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata |
title_full_unstemmed |
Heat tolerance of the secondarily temperate Antarctic notothenioid, Notothenia angustata |
title_sort |
heat tolerance of the secondarily temperate antarctic notothenioid, notothenia angustata |
publisher |
Cambridge University Press (CUP) |
publishDate |
2011 |
url |
http://dx.doi.org/10.1017/s0954102011000836 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102011000836 |
geographic |
Antarctic Southern Ocean The Antarctic New Zealand |
geographic_facet |
Antarctic Southern Ocean The Antarctic New Zealand |
genre |
Antarc* Antarctic Antarctic Science Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Science Southern Ocean |
op_source |
Antarctic Science volume 24, issue 2, page 165-172 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102011000836 |
container_title |
Antarctic Science |
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24 |
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2 |
container_start_page |
165 |
op_container_end_page |
172 |
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1798842318678130688 |