The impact of predation by marine mammals on Patagonian toothfish longline fisheries
Predatory interaction of marine mammals with longline fisheries is observed globally, leading to partial or complete loss of the catch and in some parts of the world to considerable financial loss. Depredation can also create additional unrecorded fishing mortality of a stock and has the potential t...
Published in: | PLOS ONE |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Public Library of Science
2015
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/510148/ https://nora.nerc.ac.uk/id/eprint/510148/1/Marta.pdf https://doi.org/10.1371/journal.pone.0118113 |
id |
ftnerc:oai:nora.nerc.ac.uk:510148 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:510148 2023-05-15T13:49:32+02:00 The impact of predation by marine mammals on Patagonian toothfish longline fisheries Söffker, Marta Trathan, Phil Clark, James Collins, Martin A. Belchier, Mark Scott, Robert 2015-03-04 text http://nora.nerc.ac.uk/id/eprint/510148/ https://nora.nerc.ac.uk/id/eprint/510148/1/Marta.pdf https://doi.org/10.1371/journal.pone.0118113 en eng Public Library of Science https://nora.nerc.ac.uk/id/eprint/510148/1/Marta.pdf Söffker, Marta; Trathan, Phil orcid:0000-0001-6673-9930 Clark, James; Collins, Martin A.; Belchier, Mark; Scott, Robert. 2015 The impact of predation by marine mammals on Patagonian toothfish longline fisheries. PLOS ONE, 10 (3), e0118113. https://doi.org/10.1371/journal.pone.0118113 <https://doi.org/10.1371/journal.pone.0118113> cc_by CC-BY Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1371/journal.pone.0118113 2023-02-04T19:41:16Z Predatory interaction of marine mammals with longline fisheries is observed globally, leading to partial or complete loss of the catch and in some parts of the world to considerable financial loss. Depredation can also create additional unrecorded fishing mortality of a stock and has the potential to introduce bias to stock assessments. Here we aim to characterise depredation in the Patagonian toothfish (Dissostichus eleginoides) fishery around South Georgia focusing on the spatio-temporal component of these interactions. Antarctic fur seals (Arctocephalus gazella), sperm whales (Physeter macrocephalus), and orcas (Orcinus orca) frequently feed on fish hooked on longlines around South Georgia. A third of longlines encounter sperm whales, but loss of catch due to sperm whales is insignificant when compared to that due to orcas, which interact with only 5% of longlines but can take more than half of the catch in some cases. Orca depredation around South Georgia is spatially limited and focused in areas of putative migration routes, and the impact is compounded as a result of the fishery also concentrating in those areas at those times. Understanding the seasonal behaviour of orcas and the spatial and temporal distribution of “depredation hot spots” can reduce marine mammal interactions, will improve assessment and management of the stock and contribute to increased operational efficiency of the fishery. Such information is valuable in the effort to resolve the human-mammal conflict for resources. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus Natural Environment Research Council: NERC Open Research Archive Antarctic PLOS ONE 10 3 e0118113 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Predatory interaction of marine mammals with longline fisheries is observed globally, leading to partial or complete loss of the catch and in some parts of the world to considerable financial loss. Depredation can also create additional unrecorded fishing mortality of a stock and has the potential to introduce bias to stock assessments. Here we aim to characterise depredation in the Patagonian toothfish (Dissostichus eleginoides) fishery around South Georgia focusing on the spatio-temporal component of these interactions. Antarctic fur seals (Arctocephalus gazella), sperm whales (Physeter macrocephalus), and orcas (Orcinus orca) frequently feed on fish hooked on longlines around South Georgia. A third of longlines encounter sperm whales, but loss of catch due to sperm whales is insignificant when compared to that due to orcas, which interact with only 5% of longlines but can take more than half of the catch in some cases. Orca depredation around South Georgia is spatially limited and focused in areas of putative migration routes, and the impact is compounded as a result of the fishery also concentrating in those areas at those times. Understanding the seasonal behaviour of orcas and the spatial and temporal distribution of “depredation hot spots” can reduce marine mammal interactions, will improve assessment and management of the stock and contribute to increased operational efficiency of the fishery. Such information is valuable in the effort to resolve the human-mammal conflict for resources. |
format |
Article in Journal/Newspaper |
author |
Söffker, Marta Trathan, Phil Clark, James Collins, Martin A. Belchier, Mark Scott, Robert |
spellingShingle |
Söffker, Marta Trathan, Phil Clark, James Collins, Martin A. Belchier, Mark Scott, Robert The impact of predation by marine mammals on Patagonian toothfish longline fisheries |
author_facet |
Söffker, Marta Trathan, Phil Clark, James Collins, Martin A. Belchier, Mark Scott, Robert |
author_sort |
Söffker, Marta |
title |
The impact of predation by marine mammals on Patagonian toothfish longline fisheries |
title_short |
The impact of predation by marine mammals on Patagonian toothfish longline fisheries |
title_full |
The impact of predation by marine mammals on Patagonian toothfish longline fisheries |
title_fullStr |
The impact of predation by marine mammals on Patagonian toothfish longline fisheries |
title_full_unstemmed |
The impact of predation by marine mammals on Patagonian toothfish longline fisheries |
title_sort |
impact of predation by marine mammals on patagonian toothfish longline fisheries |
publisher |
Public Library of Science |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/510148/ https://nora.nerc.ac.uk/id/eprint/510148/1/Marta.pdf https://doi.org/10.1371/journal.pone.0118113 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
op_relation |
https://nora.nerc.ac.uk/id/eprint/510148/1/Marta.pdf Söffker, Marta; Trathan, Phil orcid:0000-0001-6673-9930 Clark, James; Collins, Martin A.; Belchier, Mark; Scott, Robert. 2015 The impact of predation by marine mammals on Patagonian toothfish longline fisheries. PLOS ONE, 10 (3), e0118113. https://doi.org/10.1371/journal.pone.0118113 <https://doi.org/10.1371/journal.pone.0118113> |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0118113 |
container_title |
PLOS ONE |
container_volume |
10 |
container_issue |
3 |
container_start_page |
e0118113 |
_version_ |
1766251484684484608 |