Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch
The endangered New Zealand sea lion, Phocarctos hookeri is killed as incidental bycatch in a trawl fishery operating near their second largest population on Campbell Island in New Zealand's sub-Antarctic. Using the Potential Biological Removal (PBR) procedure to assess the sustainability of thi...
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Language: | English |
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Academic Press Ltd Elsevier Science Ltd
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Online Access: | https://doi.org/10.1093/icesjms/fsz039 http://ecite.utas.edu.au/137540 |
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ftunivtasecite:oai:ecite.utas.edu.au:137540 2023-05-15T13:55:18+02:00 Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch Hamilton, S Baker, GB 2019 https://doi.org/10.1093/icesjms/fsz039 http://ecite.utas.edu.au/137540 en eng Academic Press Ltd Elsevier Science Ltd http://dx.doi.org/10.1093/icesjms/fsz039 Hamilton, S and Baker, GB, Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch, ICES Journal of Marine Science, 76, (6) pp. 1794-1806. ISSN 1054-3139 (2019) [Refereed Article] http://ecite.utas.edu.au/137540 Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1093/icesjms/fsz039 2020-04-27T22:16:16Z The endangered New Zealand sea lion, Phocarctos hookeri is killed as incidental bycatch in a trawl fishery operating near their second largest population on Campbell Island in New Zealand's sub-Antarctic. Using the Potential Biological Removal (PBR) procedure to assess the sustainability of this bycatch for the sea lion population on Campbell Island indicated that annual bycatch estimates, particularly following the implementation of bycatch mitigation measures, are below the PBR threshold of 25 (derived using a precautionary approach). Preliminary Population Viability Analysis (PVA) modelling supported the finding that current bycatch levels, especially given a strong male bias (98%) in bycatch, are sustainable for this population. Models showed that reducing pup mortality through management actions, such as installing ramps in wallows where large numbers of pups drown, would lead to increased population growth. While obtaining more accurate data on population status and demographic parameters for the Campbell Island population should be a priority, this will take many years of research. The PBR and PVA tools demonstrate that contemporary conservation management should continue to focus on increasing pup survival while maintaining mitigation approaches that have reduced bycatch to low levels, together with high observer coverage to sustain confidence in annual bycatch estimates. Article in Journal/Newspaper Antarc* Antarctic eCite UTAS (University of Tasmania) Antarctic New Zealand Campbell Island ENVELOPE(169.500,169.500,-52.500,-52.500) Wallows ENVELOPE(-45.605,-45.605,-60.691,-60.691) ICES Journal of Marine Science 76 6 1794 1806 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management |
spellingShingle |
Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management Hamilton, S Baker, GB Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch |
topic_facet |
Agricultural and Veterinary Sciences Fisheries Sciences Fisheries Management |
description |
The endangered New Zealand sea lion, Phocarctos hookeri is killed as incidental bycatch in a trawl fishery operating near their second largest population on Campbell Island in New Zealand's sub-Antarctic. Using the Potential Biological Removal (PBR) procedure to assess the sustainability of this bycatch for the sea lion population on Campbell Island indicated that annual bycatch estimates, particularly following the implementation of bycatch mitigation measures, are below the PBR threshold of 25 (derived using a precautionary approach). Preliminary Population Viability Analysis (PVA) modelling supported the finding that current bycatch levels, especially given a strong male bias (98%) in bycatch, are sustainable for this population. Models showed that reducing pup mortality through management actions, such as installing ramps in wallows where large numbers of pups drown, would lead to increased population growth. While obtaining more accurate data on population status and demographic parameters for the Campbell Island population should be a priority, this will take many years of research. The PBR and PVA tools demonstrate that contemporary conservation management should continue to focus on increasing pup survival while maintaining mitigation approaches that have reduced bycatch to low levels, together with high observer coverage to sustain confidence in annual bycatch estimates. |
format |
Article in Journal/Newspaper |
author |
Hamilton, S Baker, GB |
author_facet |
Hamilton, S Baker, GB |
author_sort |
Hamilton, S |
title |
Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch |
title_short |
Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch |
title_full |
Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch |
title_fullStr |
Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch |
title_full_unstemmed |
Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch |
title_sort |
population growth of an endangered pinniped - the new zealand sea lion ( phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch |
publisher |
Academic Press Ltd Elsevier Science Ltd |
publishDate |
2019 |
url |
https://doi.org/10.1093/icesjms/fsz039 http://ecite.utas.edu.au/137540 |
long_lat |
ENVELOPE(169.500,169.500,-52.500,-52.500) ENVELOPE(-45.605,-45.605,-60.691,-60.691) |
geographic |
Antarctic New Zealand Campbell Island Wallows |
geographic_facet |
Antarctic New Zealand Campbell Island Wallows |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://dx.doi.org/10.1093/icesjms/fsz039 Hamilton, S and Baker, GB, Population growth of an endangered pinniped - the New Zealand sea lion ( Phocarctos hookeri ) - is limited more by high pup mortality than fisheries bycatch, ICES Journal of Marine Science, 76, (6) pp. 1794-1806. ISSN 1054-3139 (2019) [Refereed Article] http://ecite.utas.edu.au/137540 |
op_doi |
https://doi.org/10.1093/icesjms/fsz039 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
6 |
container_start_page |
1794 |
op_container_end_page |
1806 |
_version_ |
1766261720913805312 |