Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective
Antarctic krill (Euphausia superba) is a key species in the marine ecosystem of the Southern Ocean, but is also the target of a commercial fishery, with an important fishing ground in the South Orkney Islands region. The potential for competition for krill between predators and the fishery requires...
Published in: | Journal of Marine Systems |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
2024
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Online Access: | http://nora.nerc.ac.uk/id/eprint/534268/ https://nora.nerc.ac.uk/id/eprint/534268/1/1-s2.0-S0924796323000647-main.pdf https://www.sciencedirect.com/science/article/pii/S0924796323000647 |
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ftnerc:oai:nora.nerc.ac.uk:534268 2024-02-04T09:55:39+01:00 Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective Young, Emma F. Thorpe, Sally E. Renner, Angelika H.H. Murphy, Eugene J. 2024-01 text http://nora.nerc.ac.uk/id/eprint/534268/ https://nora.nerc.ac.uk/id/eprint/534268/1/1-s2.0-S0924796323000647-main.pdf https://www.sciencedirect.com/science/article/pii/S0924796323000647 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/534268/1/1-s2.0-S0924796323000647-main.pdf Young, Emma F. orcid:0000-0002-7069-6109 Thorpe, Sally E. orcid:0000-0002-5193-6955 Renner, Angelika H.H.; Murphy, Eugene J. orcid:0000-0002-7369-9196 . 2024 Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective. Journal of Marine Systems, 241, 103920. 16, pp. https://doi.org/10.1016/j.jmarsys.2023.103920 <https://doi.org/10.1016/j.jmarsys.2023.103920> cc_by_4 Publication - Article PeerReviewed 2024 ftnerc https://doi.org/10.1016/j.jmarsys.2023.103920 2024-01-05T00:03:05Z Antarctic krill (Euphausia superba) is a key species in the marine ecosystem of the Southern Ocean, but is also the target of a commercial fishery, with an important fishing ground in the South Orkney Islands region. The potential for competition for krill between predators and the fishery requires risk management strategies for the fishery, underpinned by an understanding of the key physical and behavioural drivers of krill movement and retention in target areas. Here, we present the results of a regional modelling study, combining a high-resolution ocean-sea ice model and an individual-based model parameterised for krill, to elucidate the roles of oceanographic variability and krill behaviour on patterns of transport and retention on and around the South Orkney Plateau. Simulations suggest that oceanic transport from sources around the Antarctic Peninsula is restricted by the northward flowing Antarctic Slope Current. Around the South Orkney Plateau, anticyclonic flows associated with the Weddell Front and the shelf edge transport krill rapidly towards the main fishing grounds to the northwest of the plateau. Transport onto the shelf and subsequent retention are influenced by the strength and direction of regional winds; weaker on-shelf transport and shorter retention times are associated with stronger westerly and northerly winds. The incorporation of sea-ice associated behaviour, whereby krill are moved with sea ice when sea ice is present, significantly modifies the patterns from purely oceanic transport; it reduces the influence of strong regional oceanic flows and increases transport of krill to the South Orkneys region from the Antarctic Peninsula. The inclusion of diel vertical migration also modifies predicted patterns from oceanic transport, but to a lesser extent, and moderates the impact of including sea-ice associated behaviour. We highlight the importance of understanding the behaviour of krill, including age-dependent behavioural changes in response to sea ice conditions, for modelling and ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Sea ice South Orkney Islands Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Fishing Ground ENVELOPE(-55.848,-55.848,49.550,49.550) South Orkney Plateau ENVELOPE(-44.157,-44.157,-60.690,-60.690) Journal of Marine Systems 241 103920 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Antarctic krill (Euphausia superba) is a key species in the marine ecosystem of the Southern Ocean, but is also the target of a commercial fishery, with an important fishing ground in the South Orkney Islands region. The potential for competition for krill between predators and the fishery requires risk management strategies for the fishery, underpinned by an understanding of the key physical and behavioural drivers of krill movement and retention in target areas. Here, we present the results of a regional modelling study, combining a high-resolution ocean-sea ice model and an individual-based model parameterised for krill, to elucidate the roles of oceanographic variability and krill behaviour on patterns of transport and retention on and around the South Orkney Plateau. Simulations suggest that oceanic transport from sources around the Antarctic Peninsula is restricted by the northward flowing Antarctic Slope Current. Around the South Orkney Plateau, anticyclonic flows associated with the Weddell Front and the shelf edge transport krill rapidly towards the main fishing grounds to the northwest of the plateau. Transport onto the shelf and subsequent retention are influenced by the strength and direction of regional winds; weaker on-shelf transport and shorter retention times are associated with stronger westerly and northerly winds. The incorporation of sea-ice associated behaviour, whereby krill are moved with sea ice when sea ice is present, significantly modifies the patterns from purely oceanic transport; it reduces the influence of strong regional oceanic flows and increases transport of krill to the South Orkneys region from the Antarctic Peninsula. The inclusion of diel vertical migration also modifies predicted patterns from oceanic transport, but to a lesser extent, and moderates the impact of including sea-ice associated behaviour. We highlight the importance of understanding the behaviour of krill, including age-dependent behavioural changes in response to sea ice conditions, for modelling and ... |
format |
Article in Journal/Newspaper |
author |
Young, Emma F. Thorpe, Sally E. Renner, Angelika H.H. Murphy, Eugene J. |
spellingShingle |
Young, Emma F. Thorpe, Sally E. Renner, Angelika H.H. Murphy, Eugene J. Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective |
author_facet |
Young, Emma F. Thorpe, Sally E. Renner, Angelika H.H. Murphy, Eugene J. |
author_sort |
Young, Emma F. |
title |
Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective |
title_short |
Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective |
title_full |
Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective |
title_fullStr |
Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective |
title_full_unstemmed |
Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective |
title_sort |
environmental and behavioural drivers of antarctic krill distribution at the south orkney islands: a regional perspective |
publisher |
Elsevier |
publishDate |
2024 |
url |
http://nora.nerc.ac.uk/id/eprint/534268/ https://nora.nerc.ac.uk/id/eprint/534268/1/1-s2.0-S0924796323000647-main.pdf https://www.sciencedirect.com/science/article/pii/S0924796323000647 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-55.848,-55.848,49.550,49.550) ENVELOPE(-44.157,-44.157,-60.690,-60.690) |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell South Orkney Islands Fishing Ground South Orkney Plateau |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell South Orkney Islands Fishing Ground South Orkney Plateau |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Sea ice South Orkney Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Sea ice South Orkney Islands Southern Ocean |
op_relation |
https://nora.nerc.ac.uk/id/eprint/534268/1/1-s2.0-S0924796323000647-main.pdf Young, Emma F. orcid:0000-0002-7069-6109 Thorpe, Sally E. orcid:0000-0002-5193-6955 Renner, Angelika H.H.; Murphy, Eugene J. orcid:0000-0002-7369-9196 . 2024 Environmental and behavioural drivers of Antarctic krill distribution at the South Orkney Islands: A regional perspective. Journal of Marine Systems, 241, 103920. 16, pp. https://doi.org/10.1016/j.jmarsys.2023.103920 <https://doi.org/10.1016/j.jmarsys.2023.103920> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1016/j.jmarsys.2023.103920 |
container_title |
Journal of Marine Systems |
container_volume |
241 |
container_start_page |
103920 |
_version_ |
1789959711049646080 |