Relative Changes in KrillAbundance 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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ftutahsudc:oai:digitalcommons.usu.edu:biology_facpub-1596 2023-05-15T13:30:59+02:00 Relative Changes in KrillAbundance Inferred from Antarctic Fur Seal Huang, T. Sun, L. Stark, John M. Wang, Y. Cheng, Z. Yang, Q. Sun, S. 2011-01-01T08:00:00Z application/pdf https://digitalcommons.usu.edu/biology_facpub/597 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1596&context=biology_facpub unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/biology_facpub/597 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1596&context=biology_facpub Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. PDM Biology Faculty Publications krill antarctic fur seal Biology text 2011 ftutahsudc 2022-03-07T21:16:17Z 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 (d13C) and nitrogen (d15N) isotopes of archival seal hairs. Since Antarctic fur seals feed preferentially on krill, the variation of d15N 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 d15N values indicated decreasing krill availability. This is agreement with direct observation for the past ,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. Text Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Antarctic Krill Antarctic Peninsula Arctocephalus gazella Euphausia superba Southern Ocean Utah State University: DigitalCommons@USU Antarctic Antarctic Peninsula Southern Ocean |
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Utah State University: DigitalCommons@USU |
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krill antarctic fur seal Biology |
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krill antarctic fur seal Biology Huang, T. Sun, L. Stark, John M. Wang, Y. Cheng, Z. Yang, Q. Sun, S. Relative Changes in KrillAbundance Inferred from Antarctic Fur Seal |
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krill antarctic fur seal Biology |
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 (d13C) and nitrogen (d15N) isotopes of archival seal hairs. Since Antarctic fur seals feed preferentially on krill, the variation of d15N 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 d15N values indicated decreasing krill availability. This is agreement with direct observation for the past ,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 |
Text |
author |
Huang, T. Sun, L. Stark, John M. Wang, Y. Cheng, Z. Yang, Q. Sun, S. |
author_facet |
Huang, T. Sun, L. Stark, John M. Wang, Y. Cheng, Z. Yang, Q. Sun, S. |
author_sort |
Huang, T. |
title |
Relative Changes in KrillAbundance Inferred from Antarctic Fur Seal |
title_short |
Relative Changes in KrillAbundance Inferred from Antarctic Fur Seal |
title_full |
Relative Changes in KrillAbundance Inferred from Antarctic Fur Seal |
title_fullStr |
Relative Changes in KrillAbundance Inferred from Antarctic Fur Seal |
title_full_unstemmed |
Relative Changes in KrillAbundance Inferred from Antarctic Fur Seal |
title_sort |
relative changes in krillabundance inferred from antarctic fur seal |
publisher |
Hosted by Utah State University Libraries |
publishDate |
2011 |
url |
https://digitalcommons.usu.edu/biology_facpub/597 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1596&context=biology_facpub |
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_source |
Biology Faculty Publications |
op_relation |
https://digitalcommons.usu.edu/biology_facpub/597 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1596&context=biology_facpub |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. |
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PDM |
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1766014779932016640 |