Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector
The Southern Ocean provides strong contrasts in rates and directions of change in temperature and sea ice between its sectors, but it is unknown how these affect plankton species that are distributed right around Antarctica. Here, we quantify the changing circumpolar distributions of Antarctic krill...
Published in: | Limnology and Oceanography |
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/168908 2023-05-15T13:50:09+02:00 Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector Yang, Guang Atkinson, Angus Hill, Simeon L. Guglielmo, Letterio Granata, Antonia Li, Chaolun 2020-09-21 http://ir.qdio.ac.cn/handle/337002/168907 http://ir.qdio.ac.cn/handle/337002/168908 https://doi.org/10.1002/lno.11603 英语 eng WILEY LIMNOLOGY AND OCEANOGRAPHY http://ir.qdio.ac.cn/handle/337002/168907 http://ir.qdio.ac.cn/handle/337002/168908 doi:10.1002/lno.11603 Marine & Freshwater Biology Oceanography Limnology 期刊论文 2020 ftchinacasciocas https://doi.org/10.1002/lno.11603 2022-06-27T05:43:13Z The Southern Ocean provides strong contrasts in rates and directions of change in temperature and sea ice between its sectors, but it is unknown how these affect plankton species that are distributed right around Antarctica. Here, we quantify the changing circumpolar distributions of Antarctic krill, based on the CHINARE 2013/14 circum-Antarctic expedition, plus independent analyses of compiled abundance data (KRILLBASE: 1926-2016). In the 1920s-1930s, average krill densities in the Atlantic-Bellingshausen sector were eight times those in the other sectors. More recently, however, the concentration factor has dropped to only about twofold. This reflects a rebalancing broadly commensurate with climatic forcing: krill densities declined in the Atlantic-Bellingshausen sector which has warmed and lost sea ice, densities may have increased in the Ross-Pacific sector which showed the opposite climatic trend, while densities showed no significant changes in the more stable Lazarev-Indian sectors. Such changes would impact circumpolar food webs, so to better define these we examined circumpolar trends of isotopic values in krill and other zooplankton based on the CHINARE cruise and a literature meta-analysis. Krill delta N-15 values ranged significantly between sectors from 2.21 parts per thousand (Indian) to 3.59 parts per thousand (Ross-Pacific), about half a trophic level lower than another key euphausiid,Thysanoessa macrura. These isoscapes form a baseline for interpreting the reliance of predators on euphausiids, within the varying food webs around the continent. Overall, we suggest that the Indo-Pacific sector has acted as a refuge for the circumpolar krill stock while conditions for them deteriorated rapidly in the Atlantic sector. Report Antarc* Antarctic Antarctic Krill Antarctica Sea ice Southern Ocean Thysanoessa macrura Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Antarctic Indian Lazarev ENVELOPE(12.917,12.917,-69.967,-69.967) Pacific Southern Ocean Limnology and Oceanography 66 1 272 287 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Marine & Freshwater Biology Oceanography Limnology |
spellingShingle |
Marine & Freshwater Biology Oceanography Limnology Yang, Guang Atkinson, Angus Hill, Simeon L. Guglielmo, Letterio Granata, Antonia Li, Chaolun Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector |
topic_facet |
Marine & Freshwater Biology Oceanography Limnology |
description |
The Southern Ocean provides strong contrasts in rates and directions of change in temperature and sea ice between its sectors, but it is unknown how these affect plankton species that are distributed right around Antarctica. Here, we quantify the changing circumpolar distributions of Antarctic krill, based on the CHINARE 2013/14 circum-Antarctic expedition, plus independent analyses of compiled abundance data (KRILLBASE: 1926-2016). In the 1920s-1930s, average krill densities in the Atlantic-Bellingshausen sector were eight times those in the other sectors. More recently, however, the concentration factor has dropped to only about twofold. This reflects a rebalancing broadly commensurate with climatic forcing: krill densities declined in the Atlantic-Bellingshausen sector which has warmed and lost sea ice, densities may have increased in the Ross-Pacific sector which showed the opposite climatic trend, while densities showed no significant changes in the more stable Lazarev-Indian sectors. Such changes would impact circumpolar food webs, so to better define these we examined circumpolar trends of isotopic values in krill and other zooplankton based on the CHINARE cruise and a literature meta-analysis. Krill delta N-15 values ranged significantly between sectors from 2.21 parts per thousand (Indian) to 3.59 parts per thousand (Ross-Pacific), about half a trophic level lower than another key euphausiid,Thysanoessa macrura. These isoscapes form a baseline for interpreting the reliance of predators on euphausiids, within the varying food webs around the continent. Overall, we suggest that the Indo-Pacific sector has acted as a refuge for the circumpolar krill stock while conditions for them deteriorated rapidly in the Atlantic sector. |
format |
Report |
author |
Yang, Guang Atkinson, Angus Hill, Simeon L. Guglielmo, Letterio Granata, Antonia Li, Chaolun |
author_facet |
Yang, Guang Atkinson, Angus Hill, Simeon L. Guglielmo, Letterio Granata, Antonia Li, Chaolun |
author_sort |
Yang, Guang |
title |
Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector |
title_short |
Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector |
title_full |
Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector |
title_fullStr |
Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector |
title_full_unstemmed |
Changing circumpolar distributions and isoscapes of Antarctic krill:Indo-Pacifichabitat refuges counter long-term degradation of the Atlantic sector |
title_sort |
changing circumpolar distributions and isoscapes of antarctic krill:indo-pacifichabitat refuges counter long-term degradation of the atlantic sector |
publisher |
WILEY |
publishDate |
2020 |
url |
http://ir.qdio.ac.cn/handle/337002/168907 http://ir.qdio.ac.cn/handle/337002/168908 https://doi.org/10.1002/lno.11603 |
long_lat |
ENVELOPE(12.917,12.917,-69.967,-69.967) |
geographic |
Antarctic Indian Lazarev Pacific Southern Ocean |
geographic_facet |
Antarctic Indian Lazarev Pacific Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Sea ice Southern Ocean Thysanoessa macrura |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Sea ice Southern Ocean Thysanoessa macrura |
op_relation |
LIMNOLOGY AND OCEANOGRAPHY http://ir.qdio.ac.cn/handle/337002/168907 http://ir.qdio.ac.cn/handle/337002/168908 doi:10.1002/lno.11603 |
op_doi |
https://doi.org/10.1002/lno.11603 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
1 |
container_start_page |
272 |
op_container_end_page |
287 |
_version_ |
1766253126297321472 |