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...
Published in: | ICES Journal of Marine Science |
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Academic Press Ltd Elsevier Science Ltd
2019
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Online Access: | https://eprints.utas.edu.au/32722/ |
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ftunivtasmania:oai:eprints.utas.edu.au:32722 2023-05-15T13:42:39+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, SA Baker, GB 2019 https://eprints.utas.edu.au/32722/ unknown Academic Press Ltd Elsevier Science Ltd Hamilton, SA orcid:0000-0002-6512-9900 and Baker, GB 2019 , '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, vol. 76, no. 6 , pp. 1794-1806 , doi:10.1093/icesjms/fsz039 <http://dx.doi.org/10.1093/icesjms/fsz039>. bycatch bycatch mitigation fisheries management pinniped population assessment population modelling pup mortality Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.1093/icesjms/fsz039 2021-11-22T23:17:50Z 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 University of Tasmania: UTas ePrints 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 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
bycatch bycatch mitigation fisheries management pinniped population assessment population modelling pup mortality |
spellingShingle |
bycatch bycatch mitigation fisheries management pinniped population assessment population modelling pup mortality Hamilton, SA 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 |
bycatch bycatch mitigation fisheries management pinniped population assessment population modelling pup mortality |
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, SA Baker, GB |
author_facet |
Hamilton, SA Baker, GB |
author_sort |
Hamilton, SA |
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://eprints.utas.edu.au/32722/ |
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 |
Hamilton, SA orcid:0000-0002-6512-9900 and Baker, GB 2019 , '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, vol. 76, no. 6 , pp. 1794-1806 , doi:10.1093/icesjms/fsz039 <http://dx.doi.org/10.1093/icesjms/fsz039>. |
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_ |
1766170664201355264 |