A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula
The Antarctic Peninsula (AP) is rapidly warming and empirical data on abundance trends of marine organisms are required to understand the impact of these physical changes, and interacting anthropogenic impacts, on the ecosystem. Recent estimates inferred increasing abundance of Type A killer whales...
Published in: | Marine Mammal Science |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/709673ef-05fd-40b2-9782-efe59bc588bf 2023-05-15T13:53:11+02:00 A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula Fearnbach, Holly Durban, John W. Ellifrit, David K. Paredes, Alyssa Hickmott, Leigh S. Pitman, Robert L. 2021-07-08 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/a-decade-of-photoidentification-reveals-contrasting-abundance-and-trends-of-type-b-killer-whales-in-the-coastal-waters-of-the-antarctic-peninsula(709673ef-05fd-40b2-9782-efe59bc588bf).html https://doi.org/10.1111/mms.12846 eng eng info:eu-repo/semantics/restrictedAccess Fearnbach , H , Durban , J W , Ellifrit , D K , Paredes , A , Hickmott , L S & Pitman , R L 2021 , ' A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula ' , Marine Mammal Science , vol. Early View . https://doi.org/10.1111/mms.12846 Antarctica Mark-recapture Orcinus orca Population dynamics article 2021 ftunstandrewcris https://doi.org/10.1111/mms.12846 2021-12-26T14:38:49Z The Antarctic Peninsula (AP) is rapidly warming and empirical data on abundance trends of marine organisms are required to understand the impact of these physical changes, and interacting anthropogenic impacts, on the ecosystem. Recent estimates inferred increasing abundance of Type A killer whales at the top of this food chain, and here we provide new data on the abundance of Type B1 and B2 killer whales using photographic mark-recaptures collected during austral summers from 2008/2009 to 2017/2018. Both ecotypes were regularly photographed around the AP coastline, particularly off the west side, and individuals of both showed site fidelity across years. B1s had a higher re-identification rate (58% photographed in multiple years, range: 1-7 years) compared to B2s (31%, 1-4 years). We fit mark-recapture models that allowed temporary emigration beyond the study area, to effectively monitor the size of wide-ranging populations and documented contrasting trends for B1s and B2s. A smaller population size (~102) of B1s was estimated to use the area, with a declining trend in abundance (-4.7% per year) and reduced apparent survival in recent years. In contrast, a much larger population size (~740) of B2s was estimated to be generally stable in abundance and apparent survival over the past decade. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Orca Orcinus orca University of St Andrews: Research Portal Antarctic Antarctic Peninsula Austral The Antarctic Marine Mammal Science 38 1 58 72 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Antarctica Mark-recapture Orcinus orca Population dynamics |
spellingShingle |
Antarctica Mark-recapture Orcinus orca Population dynamics Fearnbach, Holly Durban, John W. Ellifrit, David K. Paredes, Alyssa Hickmott, Leigh S. Pitman, Robert L. A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula |
topic_facet |
Antarctica Mark-recapture Orcinus orca Population dynamics |
description |
The Antarctic Peninsula (AP) is rapidly warming and empirical data on abundance trends of marine organisms are required to understand the impact of these physical changes, and interacting anthropogenic impacts, on the ecosystem. Recent estimates inferred increasing abundance of Type A killer whales at the top of this food chain, and here we provide new data on the abundance of Type B1 and B2 killer whales using photographic mark-recaptures collected during austral summers from 2008/2009 to 2017/2018. Both ecotypes were regularly photographed around the AP coastline, particularly off the west side, and individuals of both showed site fidelity across years. B1s had a higher re-identification rate (58% photographed in multiple years, range: 1-7 years) compared to B2s (31%, 1-4 years). We fit mark-recapture models that allowed temporary emigration beyond the study area, to effectively monitor the size of wide-ranging populations and documented contrasting trends for B1s and B2s. A smaller population size (~102) of B1s was estimated to use the area, with a declining trend in abundance (-4.7% per year) and reduced apparent survival in recent years. In contrast, a much larger population size (~740) of B2s was estimated to be generally stable in abundance and apparent survival over the past decade. |
format |
Article in Journal/Newspaper |
author |
Fearnbach, Holly Durban, John W. Ellifrit, David K. Paredes, Alyssa Hickmott, Leigh S. Pitman, Robert L. |
author_facet |
Fearnbach, Holly Durban, John W. Ellifrit, David K. Paredes, Alyssa Hickmott, Leigh S. Pitman, Robert L. |
author_sort |
Fearnbach, Holly |
title |
A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula |
title_short |
A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula |
title_full |
A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula |
title_fullStr |
A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula |
title_full_unstemmed |
A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula |
title_sort |
decade of photo-identification reveals contrasting abundance and trends of type b killer whales in the coastal waters of the antarctic peninsula |
publishDate |
2021 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/a-decade-of-photoidentification-reveals-contrasting-abundance-and-trends-of-type-b-killer-whales-in-the-coastal-waters-of-the-antarctic-peninsula(709673ef-05fd-40b2-9782-efe59bc588bf).html https://doi.org/10.1111/mms.12846 |
geographic |
Antarctic Antarctic Peninsula Austral The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Austral The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Orca Orcinus orca |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Orca Orcinus orca |
op_source |
Fearnbach , H , Durban , J W , Ellifrit , D K , Paredes , A , Hickmott , L S & Pitman , R L 2021 , ' A decade of photo-identification reveals contrasting abundance and trends of Type B killer whales in the coastal waters of the Antarctic Peninsula ' , Marine Mammal Science , vol. Early View . https://doi.org/10.1111/mms.12846 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/mms.12846 |
container_title |
Marine Mammal Science |
container_volume |
38 |
container_issue |
1 |
container_start_page |
58 |
op_container_end_page |
72 |
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1766258151857848320 |