Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal
Antarctic krill Euphausia superba is a predominant species in the Southern Ocean, it is very sensitive to climate change, and it supports large stocks of fishes, seabirds, seals and whales in Antarctic marine ecosystems. Modern krill stocks have been estimated directly by net hauls and acoustic surv...
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/32943 2023-05-15T13:40:37+02:00 Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal Huang, Tao Sun, Liguang Stark, John Wang, Yuhong Cheng, Zhongqi Yang, Qichao Sun, Song 2011-11-07 http://ir.qdio.ac.cn/handle/337002/32943 https://doi.org/10.1371/journal.pone.0027331 英语 eng PLOS ONE http://ir.qdio.ac.cn/handle/337002/32943 doi:10.1371/journal.pone.0027331 Article 期刊论文 2011 ftchinacasciocas https://doi.org/10.1371/journal.pone.0027331 2022-06-27T05:37:11Z Antarctic krill Euphausia superba is a predominant species in the Southern Ocean, it is very sensitive to climate change, and it supports large stocks of fishes, seabirds, seals and whales in Antarctic marine ecosystems. Modern krill stocks have been estimated directly by net hauls and acoustic surveys; the historical krill density especially the long-term one in the Southern Ocean, however, is unknown. Here we inferred the relative krill population changes along the West Antarctic Peninsula (WAP) over the 20th century from the trophic level change of Antarctic fur seal Arctocephalus gazella using stable carbon (delta C-13) and nitrogen (delta N-15) isotopes of archival seal hairs. Since Antarctic fur seals feed preferentially on krill, the variation of delta N-15 in seal hair indicates a change in the proportion of krill in the seal's diets and thus the krill availability in local seawater. For the past century, enriching fur seal delta N-15 values indicated decreasing krill availability. This is agreement with direct observation for the past similar to 30 years and suggests that the recently documented decline in krill populations began in the early parts of the 20th century. This novel method makes it possible to infer past krill population changes from ancient tissues of krill predators. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Antarctic Peninsula Arctocephalus gazella Euphausia superba Southern Ocean Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Antarctic Antarctic Peninsula Southern Ocean PLoS ONE 6 11 e27331 |
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Open Polar |
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Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
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ftchinacasciocas |
language |
English |
description |
Antarctic krill Euphausia superba is a predominant species in the Southern Ocean, it is very sensitive to climate change, and it supports large stocks of fishes, seabirds, seals and whales in Antarctic marine ecosystems. Modern krill stocks have been estimated directly by net hauls and acoustic surveys; the historical krill density especially the long-term one in the Southern Ocean, however, is unknown. Here we inferred the relative krill population changes along the West Antarctic Peninsula (WAP) over the 20th century from the trophic level change of Antarctic fur seal Arctocephalus gazella using stable carbon (delta C-13) and nitrogen (delta N-15) isotopes of archival seal hairs. Since Antarctic fur seals feed preferentially on krill, the variation of delta N-15 in seal hair indicates a change in the proportion of krill in the seal's diets and thus the krill availability in local seawater. For the past century, enriching fur seal delta N-15 values indicated decreasing krill availability. This is agreement with direct observation for the past similar to 30 years and suggests that the recently documented decline in krill populations began in the early parts of the 20th century. This novel method makes it possible to infer past krill population changes from ancient tissues of krill predators. |
format |
Article in Journal/Newspaper |
author |
Huang, Tao Sun, Liguang Stark, John Wang, Yuhong Cheng, Zhongqi Yang, Qichao Sun, Song |
spellingShingle |
Huang, Tao Sun, Liguang Stark, John Wang, Yuhong Cheng, Zhongqi Yang, Qichao Sun, Song Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal |
author_facet |
Huang, Tao Sun, Liguang Stark, John Wang, Yuhong Cheng, Zhongqi Yang, Qichao Sun, Song |
author_sort |
Huang, Tao |
title |
Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal |
title_short |
Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal |
title_full |
Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal |
title_fullStr |
Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal |
title_full_unstemmed |
Relative Changes in Krill Abundance Inferred from Antarctic Fur Seal |
title_sort |
relative changes in krill abundance inferred from antarctic fur seal |
publishDate |
2011 |
url |
http://ir.qdio.ac.cn/handle/337002/32943 https://doi.org/10.1371/journal.pone.0027331 |
geographic |
Antarctic Antarctic Peninsula Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Southern Ocean |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Antarctic Peninsula Arctocephalus gazella Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Antarctic Peninsula Arctocephalus gazella Euphausia superba Southern Ocean |
op_relation |
PLOS ONE http://ir.qdio.ac.cn/handle/337002/32943 doi:10.1371/journal.pone.0027331 |
op_doi |
https://doi.org/10.1371/journal.pone.0027331 |
container_title |
PLoS ONE |
container_volume |
6 |
container_issue |
11 |
container_start_page |
e27331 |
_version_ |
1766137536669810688 |