Further evidence that Antarctic toothfish are important to Weddell seals
Originally Published at 10.1017/S0954102020000437 Antarctic toothfish Dissostichus mawsoni and Weddell seals Leptonychotes weddellii are important mesopredators in the waters of the Antarctic continental shelf. They compete with each other for prey, yet the seals also prey upon toothfish. Such intra...
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ftmontanastateu:oai:scholarworks.montana.edu:1/17074 2023-05-15T13:44:28+02:00 Further evidence that Antarctic toothfish are important to Weddell seals Ainley, David G. Cziko, Paul A. Nur, Nadav Rotella, Jay J. Eastman, Joseph T. Larue, Michelle Stirling, Ian Abrams, Peter A. 2020-09 application/pdf https://scholarworks.montana.edu/xmlui/handle/1/17074 en_US eng Cambridge University Press Ainley, David G., Paul A. Cziko, Nadav Nur, Jay J. Rotella, Joseph T. Eastman, Michelle Larue, Ian Stirling, and Peter A. Abrams. "Further evidence that Antarctic toothfish are important to Weddell seals." Antarctic Science 33, no. 1 (2021): 17-29. 0954-1020 https://scholarworks.montana.edu/xmlui/handle/1/17074 cc-by-nc-nd https://creativecommons.org/licenses/by/4.0/ CC-BY-NC-ND CC-BY antarctic toothfish seals Article 2020 ftmontanastateu 2022-09-10T22:40:15Z Originally Published at 10.1017/S0954102020000437 Antarctic toothfish Dissostichus mawsoni and Weddell seals Leptonychotes weddellii are important mesopredators in the waters of the Antarctic continental shelf. They compete with each other for prey, yet the seals also prey upon toothfish. Such intraguild predation means that prevalence and respective demographic rates may be negatively correlated, but quantification is lacking. Following a review of their natural histories, we initiate an approach to address this deficiency by analysing scientific fishing catch per unit effort (CPUE; 1975–2011 plus sporadic effort to 2018) in conjunction with an annual index of seal abundance in McMurdo Sound, Ross Sea. We correlated annual variation in scientific CPUE to seal numbers over a 43 year period (1975–2018), complementing an earlier study in the same locality showing CPUE to be negatively correlated with spatial proximity to abundant seals. The observed relationship (more seals with lower CPUE, while controlling for annual trends in each) indicates the importance of toothfish as a dietary item to Weddell seals and highlights the probable importance of intra- and inter-specific competition as well as intraguild predation in seal-toothfish dynamics. Ultimately, it may be necessary to supplement fishery management with targeted ecosystem monitoring to prevent the fishery from having adverse effects on dependent species. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Antarctic Toothfish McMurdo Sound Ross Sea Weddell Seals Montana State University (MSU): ScholarWorks Antarctic McMurdo Sound Ross Sea The Antarctic Weddell |
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Open Polar |
collection |
Montana State University (MSU): ScholarWorks |
op_collection_id |
ftmontanastateu |
language |
English |
topic |
antarctic toothfish seals |
spellingShingle |
antarctic toothfish seals Ainley, David G. Cziko, Paul A. Nur, Nadav Rotella, Jay J. Eastman, Joseph T. Larue, Michelle Stirling, Ian Abrams, Peter A. Further evidence that Antarctic toothfish are important to Weddell seals |
topic_facet |
antarctic toothfish seals |
description |
Originally Published at 10.1017/S0954102020000437 Antarctic toothfish Dissostichus mawsoni and Weddell seals Leptonychotes weddellii are important mesopredators in the waters of the Antarctic continental shelf. They compete with each other for prey, yet the seals also prey upon toothfish. Such intraguild predation means that prevalence and respective demographic rates may be negatively correlated, but quantification is lacking. Following a review of their natural histories, we initiate an approach to address this deficiency by analysing scientific fishing catch per unit effort (CPUE; 1975–2011 plus sporadic effort to 2018) in conjunction with an annual index of seal abundance in McMurdo Sound, Ross Sea. We correlated annual variation in scientific CPUE to seal numbers over a 43 year period (1975–2018), complementing an earlier study in the same locality showing CPUE to be negatively correlated with spatial proximity to abundant seals. The observed relationship (more seals with lower CPUE, while controlling for annual trends in each) indicates the importance of toothfish as a dietary item to Weddell seals and highlights the probable importance of intra- and inter-specific competition as well as intraguild predation in seal-toothfish dynamics. Ultimately, it may be necessary to supplement fishery management with targeted ecosystem monitoring to prevent the fishery from having adverse effects on dependent species. |
format |
Article in Journal/Newspaper |
author |
Ainley, David G. Cziko, Paul A. Nur, Nadav Rotella, Jay J. Eastman, Joseph T. Larue, Michelle Stirling, Ian Abrams, Peter A. |
author_facet |
Ainley, David G. Cziko, Paul A. Nur, Nadav Rotella, Jay J. Eastman, Joseph T. Larue, Michelle Stirling, Ian Abrams, Peter A. |
author_sort |
Ainley, David G. |
title |
Further evidence that Antarctic toothfish are important to Weddell seals |
title_short |
Further evidence that Antarctic toothfish are important to Weddell seals |
title_full |
Further evidence that Antarctic toothfish are important to Weddell seals |
title_fullStr |
Further evidence that Antarctic toothfish are important to Weddell seals |
title_full_unstemmed |
Further evidence that Antarctic toothfish are important to Weddell seals |
title_sort |
further evidence that antarctic toothfish are important to weddell seals |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://scholarworks.montana.edu/xmlui/handle/1/17074 |
geographic |
Antarctic McMurdo Sound Ross Sea The Antarctic Weddell |
geographic_facet |
Antarctic McMurdo Sound Ross Sea The Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Science Antarctic Toothfish McMurdo Sound Ross Sea Weddell Seals |
genre_facet |
Antarc* Antarctic Antarctic Science Antarctic Toothfish McMurdo Sound Ross Sea Weddell Seals |
op_relation |
Ainley, David G., Paul A. Cziko, Nadav Nur, Jay J. Rotella, Joseph T. Eastman, Michelle Larue, Ian Stirling, and Peter A. Abrams. "Further evidence that Antarctic toothfish are important to Weddell seals." Antarctic Science 33, no. 1 (2021): 17-29. 0954-1020 https://scholarworks.montana.edu/xmlui/handle/1/17074 |
op_rights |
cc-by-nc-nd https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY-NC-ND CC-BY |
_version_ |
1766202020981637120 |