A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation
Exploitation is one of the major drivers of change in marine ecosystems. Following discovery in 1775, South Georgia saw sequential overexploitation of living resources, including seals, whales, and fish. Although exploitation is now tightly regulated, the ecosystem is still recovering. Marbled rockc...
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Oxford University Press
2021
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ftnerc:oai:nora.nerc.ac.uk:529441 2023-05-15T13:41:45+02:00 A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation Hollyman, Philip Hill, Simeon L. Lapitkhovksy, Vladminir V. Belchier, Mark Gregory, Sue Clement, Alice Collins, Martin A. 2021-11 text http://nora.nerc.ac.uk/id/eprint/529441/ https://nora.nerc.ac.uk/id/eprint/529441/1/fsab150.pdf https://academic.oup.com/icesjms/article/78/8/2745/6354501 en eng Oxford University Press https://nora.nerc.ac.uk/id/eprint/529441/1/fsab150.pdf Hollyman, Philip orcid:0000-0003-2665-5075 Hill, Simeon L. orcid:0000-0003-1441-8769 Lapitkhovksy, Vladminir V.; Belchier, Mark; Gregory, Sue; Clement, Alice; Collins, Martin A. orcid:0000-0001-7132-8650 . 2021 A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation. ICES Journal of Marine Science, 78 (8), fsab150. 2745-2756. https://doi.org/10.1093/icesjms/fsab150 <https://doi.org/10.1093/icesjms/fsab150> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1093/icesjms/fsab150 2023-02-04T19:51:38Z Exploitation is one of the major drivers of change in marine ecosystems. Following discovery in 1775, South Georgia saw sequential overexploitation of living resources, including seals, whales, and fish. Although exploitation is now tightly regulated, the ecosystem is still recovering. Marbled rockcod, Notothenia rossii (Richardson 1844), was the first fish species to be commercially exploited and high catches between 1967 and 1972 resulted in dramatic stock decline. Here, we use 30 years of trawl survey data to provide the first evidence of a sustained increase in the N. rossii population starting two decades after the prohibition of targeted fishing in 1985. The way species respond to change is mediated in part by trophic relationships with other organisms. We present the first multi-year, spatially-resolved comparison of adult N. rossii diet at South Georgia, highlighting a variable diet with less reliance on Antarctic krill than previously thought. Life history factors and possible heavy predation on early life stages might have delayed their recovery while diet plasticity potentially supported recent population growth. Due to the dynamic ecosystem at South Georgia and questions over catch reports from the period of heaviest exploitation, it is unlikely the current ecosystem could support a recovery to estimated pre-exploitation levels. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Marbled rockcod Notothenia rossii Natural Environment Research Council: NERC Open Research Archive Antarctic ICES Journal of Marine Science 78 8 2745 2756 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Exploitation is one of the major drivers of change in marine ecosystems. Following discovery in 1775, South Georgia saw sequential overexploitation of living resources, including seals, whales, and fish. Although exploitation is now tightly regulated, the ecosystem is still recovering. Marbled rockcod, Notothenia rossii (Richardson 1844), was the first fish species to be commercially exploited and high catches between 1967 and 1972 resulted in dramatic stock decline. Here, we use 30 years of trawl survey data to provide the first evidence of a sustained increase in the N. rossii population starting two decades after the prohibition of targeted fishing in 1985. The way species respond to change is mediated in part by trophic relationships with other organisms. We present the first multi-year, spatially-resolved comparison of adult N. rossii diet at South Georgia, highlighting a variable diet with less reliance on Antarctic krill than previously thought. Life history factors and possible heavy predation on early life stages might have delayed their recovery while diet plasticity potentially supported recent population growth. Due to the dynamic ecosystem at South Georgia and questions over catch reports from the period of heaviest exploitation, it is unlikely the current ecosystem could support a recovery to estimated pre-exploitation levels. |
format |
Article in Journal/Newspaper |
author |
Hollyman, Philip Hill, Simeon L. Lapitkhovksy, Vladminir V. Belchier, Mark Gregory, Sue Clement, Alice Collins, Martin A. |
spellingShingle |
Hollyman, Philip Hill, Simeon L. Lapitkhovksy, Vladminir V. Belchier, Mark Gregory, Sue Clement, Alice Collins, Martin A. A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation |
author_facet |
Hollyman, Philip Hill, Simeon L. Lapitkhovksy, Vladminir V. Belchier, Mark Gregory, Sue Clement, Alice Collins, Martin A. |
author_sort |
Hollyman, Philip |
title |
A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation |
title_short |
A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation |
title_full |
A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation |
title_fullStr |
A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation |
title_full_unstemmed |
A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation |
title_sort |
long road to recovery: dynamics and ecology of the marbled rockcod (notothenia rossii) at south georgia, 50 years after over-exploitation |
publisher |
Oxford University Press |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/529441/ https://nora.nerc.ac.uk/id/eprint/529441/1/fsab150.pdf https://academic.oup.com/icesjms/article/78/8/2745/6354501 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Marbled rockcod Notothenia rossii |
genre_facet |
Antarc* Antarctic Antarctic Krill Marbled rockcod Notothenia rossii |
op_relation |
https://nora.nerc.ac.uk/id/eprint/529441/1/fsab150.pdf Hollyman, Philip orcid:0000-0003-2665-5075 Hill, Simeon L. orcid:0000-0003-1441-8769 Lapitkhovksy, Vladminir V.; Belchier, Mark; Gregory, Sue; Clement, Alice; Collins, Martin A. orcid:0000-0001-7132-8650 . 2021 A long road to recovery: dynamics and ecology of the marbled rockcod (Notothenia rossii) at South Georgia, 50 years after over-exploitation. ICES Journal of Marine Science, 78 (8), fsab150. 2745-2756. https://doi.org/10.1093/icesjms/fsab150 <https://doi.org/10.1093/icesjms/fsab150> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1093/icesjms/fsab150 |
container_title |
ICES Journal of Marine Science |
container_volume |
78 |
container_issue |
8 |
container_start_page |
2745 |
op_container_end_page |
2756 |
_version_ |
1766157238839279616 |