Antarctic notothenioid fishes as subjects for research in evolutionary biology
Antarctica is a continental island and the waters of its shelf and upper slope are an insular evolutionary site. The shelf waters resemble a closed basin in the Southern Ocean, separated from other continents by distance, current patterns and subzero temperatures. The benthic fish fauna of the shelf...
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Online Access: | http://dx.doi.org/10.1017/s0954102000000341 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102000000341 |
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crcambridgeupr:10.1017/s0954102000000341 2024-05-12T07:54:00+00:00 Antarctic notothenioid fishes as subjects for research in evolutionary biology Eastman, Joseph T. 2000 http://dx.doi.org/10.1017/s0954102000000341 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102000000341 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 12, issue 3, page 276-287 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2000 crcambridgeupr https://doi.org/10.1017/s0954102000000341 2024-04-18T06:53:54Z Antarctica is a continental island and the waters of its shelf and upper slope are an insular evolutionary site. The shelf waters resemble a closed basin in the Southern Ocean, separated from other continents by distance, current patterns and subzero temperatures. The benthic fish fauna of the shelf and upper slope of the Antarctic Region includes 213 species with higher taxonomic diversity confined to 18 families. Ninety-six notothenioids, 67 liparids and 23 zoarcids comprise 45%, 32% and 11% of the fauna, a combined total of 88%. In high latitude (71–78°S) shelf areas notothenioids dominate abundance and biomass at levels of 90–95%. Notothenioids are also morphologically and ecologically diverse. Although they lack a swim bladder, the hallmark of the notothenioid radiation has been repeated diversification into water column habitats. There are pelagic, semipelagic, cryopelagic and epibenthic species. Notothenioids exhibit the disproportionate speciosity and high endemism characteristic of fish species flock. Antifreeze glycopeptides originating from a transformed trypsinogen gene are a key innovation. It is not known when the modern Antarctic shelf fauna assumed its current taxonomic composition. A late Eocene fossil fauna was taxonomically diverse and cosmopolitan. There was a subsequent faunal replacement with little carryover of families into the modern fauna. Basal notothenioid clades probably diverged in Gondwanan shelf locations during the early Tertiary. Dates inferred from molecular sequences suggest that phyletically derived Antarctic clades arose 15–5 m.y.a. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctica Southern Ocean Cambridge University Press Antarctic Southern Ocean The Antarctic Antarctic Science 12 3 276 287 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Eastman, Joseph T. Antarctic notothenioid fishes as subjects for research in evolutionary biology |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Antarctica is a continental island and the waters of its shelf and upper slope are an insular evolutionary site. The shelf waters resemble a closed basin in the Southern Ocean, separated from other continents by distance, current patterns and subzero temperatures. The benthic fish fauna of the shelf and upper slope of the Antarctic Region includes 213 species with higher taxonomic diversity confined to 18 families. Ninety-six notothenioids, 67 liparids and 23 zoarcids comprise 45%, 32% and 11% of the fauna, a combined total of 88%. In high latitude (71–78°S) shelf areas notothenioids dominate abundance and biomass at levels of 90–95%. Notothenioids are also morphologically and ecologically diverse. Although they lack a swim bladder, the hallmark of the notothenioid radiation has been repeated diversification into water column habitats. There are pelagic, semipelagic, cryopelagic and epibenthic species. Notothenioids exhibit the disproportionate speciosity and high endemism characteristic of fish species flock. Antifreeze glycopeptides originating from a transformed trypsinogen gene are a key innovation. It is not known when the modern Antarctic shelf fauna assumed its current taxonomic composition. A late Eocene fossil fauna was taxonomically diverse and cosmopolitan. There was a subsequent faunal replacement with little carryover of families into the modern fauna. Basal notothenioid clades probably diverged in Gondwanan shelf locations during the early Tertiary. Dates inferred from molecular sequences suggest that phyletically derived Antarctic clades arose 15–5 m.y.a. |
format |
Article in Journal/Newspaper |
author |
Eastman, Joseph T. |
author_facet |
Eastman, Joseph T. |
author_sort |
Eastman, Joseph T. |
title |
Antarctic notothenioid fishes as subjects for research in evolutionary biology |
title_short |
Antarctic notothenioid fishes as subjects for research in evolutionary biology |
title_full |
Antarctic notothenioid fishes as subjects for research in evolutionary biology |
title_fullStr |
Antarctic notothenioid fishes as subjects for research in evolutionary biology |
title_full_unstemmed |
Antarctic notothenioid fishes as subjects for research in evolutionary biology |
title_sort |
antarctic notothenioid fishes as subjects for research in evolutionary biology |
publisher |
Cambridge University Press (CUP) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1017/s0954102000000341 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102000000341 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Science Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctica Southern Ocean |
op_source |
Antarctic Science volume 12, issue 3, page 276-287 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102000000341 |
container_title |
Antarctic Science |
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12 |
container_issue |
3 |
container_start_page |
276 |
op_container_end_page |
287 |
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1798846044214132736 |