Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica
Eastward transport in the Southern Ocean is concentrated in jets associated with fronts in the Antarctic Circumpolar Current (ACC), whereas flow along the Antarctic continental slope is strongly westward in the Antarctic Slope Current (ASC). The dominant mesopelagic fish endemic to the Southern Ocea...
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2018
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ftunivtasmania:oai:eprints.utas.edu.au:45248 2023-05-15T13:41:50+02:00 Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica Zhu, G Duan, M Ashford, JR Wei, L Zhou, M Bestley, S 2018 https://eprints.utas.edu.au/45248/ unknown Elsevier Sci Ltd Zhu, G, Duan, M, Ashford, JR, Wei, L, Zhou, M and Bestley, S orcid:0000-0001-9342-669X 2018 , 'Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica' , Marine Environmental Research, vol. 142 , pp. 7-20 , doi:10.1016/j.marenvres.2018.09.010 <http://dx.doi.org/10.1016/j.marenvres.2018.09.010>. otolith chemistry East Antarctica Antarctic circumpolar current Electrona antarctica Antarctic slope front Article PeerReviewed 2018 ftunivtasmania https://doi.org/10.1016/j.marenvres.2018.09.010 2022-03-07T23:17:17Z Eastward transport in the Southern Ocean is concentrated in jets associated with fronts in the Antarctic Circumpolar Current (ACC), whereas flow along the Antarctic continental slope is strongly westward in the Antarctic Slope Current (ASC). The dominant mesopelagic fish endemic to the Southern Ocean, Electrona antarctica (Günther, 1878), has been linked to Circumpolar Deep Water (CDW) transported by the ACC, and a modified version of CDW associated with the ASC. In conjunction with a regional-scale hydrographic survey south of the Kerguelen Plateau, we sampled fish from the ACC and ASC across Princess Elizabeth Trough off East Antarctica, and examined their otolith chemistry. Material laid down in the nucleus during early life showed heterogeneity, arguing against a single homogeneous population. Instead, it suggested exposure to different environments after hatching, consistent with separate transport pathways along the ACC and ASC. Despite clear differences between stations documented in the survey, material laid down along the edge did not show heterogeneity, suggesting instead exposure to similar environments. Seasonal movement northward by ASC fish into the ACC may explain both these results, and potential physical mechanisms include circulation in the Australian-Antarctic Gyre; northward movement of slope waters along the eastern margin of Princess Elizabeth Trough; and seasonal extension of sea-ice into the ACC. Such meridional movement would expose fish to zonal flow, eastward in the ACC during winter and westward in the ASC during summer, promoting regional retention as well as creating opportunities for mixing with fish transported along the ACC. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean The Antarctic East Antarctica Kerguelen Princess Elizabeth Trough ENVELOPE(83.000,83.000,-64.167,-64.167) Marine Environmental Research 142 7 20 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
otolith chemistry East Antarctica Antarctic circumpolar current Electrona antarctica Antarctic slope front |
spellingShingle |
otolith chemistry East Antarctica Antarctic circumpolar current Electrona antarctica Antarctic slope front Zhu, G Duan, M Ashford, JR Wei, L Zhou, M Bestley, S Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica |
topic_facet |
otolith chemistry East Antarctica Antarctic circumpolar current Electrona antarctica Antarctic slope front |
description |
Eastward transport in the Southern Ocean is concentrated in jets associated with fronts in the Antarctic Circumpolar Current (ACC), whereas flow along the Antarctic continental slope is strongly westward in the Antarctic Slope Current (ASC). The dominant mesopelagic fish endemic to the Southern Ocean, Electrona antarctica (Günther, 1878), has been linked to Circumpolar Deep Water (CDW) transported by the ACC, and a modified version of CDW associated with the ASC. In conjunction with a regional-scale hydrographic survey south of the Kerguelen Plateau, we sampled fish from the ACC and ASC across Princess Elizabeth Trough off East Antarctica, and examined their otolith chemistry. Material laid down in the nucleus during early life showed heterogeneity, arguing against a single homogeneous population. Instead, it suggested exposure to different environments after hatching, consistent with separate transport pathways along the ACC and ASC. Despite clear differences between stations documented in the survey, material laid down along the edge did not show heterogeneity, suggesting instead exposure to similar environments. Seasonal movement northward by ASC fish into the ACC may explain both these results, and potential physical mechanisms include circulation in the Australian-Antarctic Gyre; northward movement of slope waters along the eastern margin of Princess Elizabeth Trough; and seasonal extension of sea-ice into the ACC. Such meridional movement would expose fish to zonal flow, eastward in the ACC during winter and westward in the ASC during summer, promoting regional retention as well as creating opportunities for mixing with fish transported along the ACC. |
format |
Article in Journal/Newspaper |
author |
Zhu, G Duan, M Ashford, JR Wei, L Zhou, M Bestley, S |
author_facet |
Zhu, G Duan, M Ashford, JR Wei, L Zhou, M Bestley, S |
author_sort |
Zhu, G |
title |
Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica |
title_short |
Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica |
title_full |
Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica |
title_fullStr |
Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica |
title_full_unstemmed |
Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica |
title_sort |
otolith nucleus chemistry distinguishes electrona antarctica in the westward-flowing antarctic slope current and eastward-flowing antarctic circumpolar current off east antarctica |
publisher |
Elsevier Sci Ltd |
publishDate |
2018 |
url |
https://eprints.utas.edu.au/45248/ |
long_lat |
ENVELOPE(83.000,83.000,-64.167,-64.167) |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctica Kerguelen Princess Elizabeth Trough |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctica Kerguelen Princess Elizabeth Trough |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_relation |
Zhu, G, Duan, M, Ashford, JR, Wei, L, Zhou, M and Bestley, S orcid:0000-0001-9342-669X 2018 , 'Otolith nucleus chemistry distinguishes Electrona antarctica in the westward-flowing Antarctic Slope Current and eastward-flowing Antarctic Circumpolar Current off East Antarctica' , Marine Environmental Research, vol. 142 , pp. 7-20 , doi:10.1016/j.marenvres.2018.09.010 <http://dx.doi.org/10.1016/j.marenvres.2018.09.010>. |
op_doi |
https://doi.org/10.1016/j.marenvres.2018.09.010 |
container_title |
Marine Environmental Research |
container_volume |
142 |
container_start_page |
7 |
op_container_end_page |
20 |
_version_ |
1766158991810887680 |