Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment
In fisheries management, assessing year-class strength and recruitment to commercial stocks is essential, but can be difficult to do for fish species where the young stages are inaccessible to ship-based surveys. This is true for the northeast Arctic saithe Pollachius virens, where the juveniles spe...
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Online Access: | http://hdl.handle.net/11250/2483030 https://doi.org/10.3354/meps12440 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2483030 2023-05-15T15:16:17+02:00 Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment Lorentsen, Svein Håkon Anker-Nilssen, Tycho Erikstad, Kjell E 2018 http://hdl.handle.net/11250/2483030 https://doi.org/10.3354/meps12440 eng eng Inter-Research Andre: Norwegian Ministry of Climate and Environment Andre: Norwegian Environment Agency Andre: Norwegian Ministry of Petroleum and Energy Marine Ecology Progress Series. 2018, 586, 193-201. urn:issn:0171-8630 http://hdl.handle.net/11250/2483030 https://doi.org/10.3354/meps12440 cristin:1543091 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 193-201 586 Marine Ecology Progress Series VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Journal article Peer reviewed 2018 ftntnutrondheimi https://doi.org/10.3354/meps12440 2019-09-17T06:53:33Z In fisheries management, assessing year-class strength and recruitment to commercial stocks is essential, but can be difficult to do for fish species where the young stages are inaccessible to ship-based surveys. This is true for the northeast Arctic saithe Pollachius virens, where the juveniles spend their first years in coastal kelp forests and therefore cannot be assessed before they enter the pelagic stock at 3 yr of age. However, as top predators in marine ecosystems, coastal seabirds might prey on the same cohort 2−3 yr earlier. Long-term studies of European shag Phalacrocorax aristotelis at a colony in central Norway have revealed strong links between the birds’ breeding performance and the availability of 0 and 1 yr old saithe in their diet. Following this, we wanted to explore if shag diet can be used as an early indicator of saithe recruitment by comparing it with abundance indices obtained by fisheries research. Our results indicate that the occurrence of 0 yr old saithe in the shag diet is a poor predictor of saithe recruitment 3 yr later. However, both the pre- and post-hatch biomass and the number and frequency of occurrence of 1 yr old saithe show a strong positive relationship with indices obtained from scientific surveys 2 yr later, indicating that shag diet can be used as an early and reasonably reliable predictor of saithe recruitment. We suggest implementing the occurrence of 1 yr old saithe in the shag diet as a supplementary tool for an adaptive management of the fisheries on young saithe. Phalacrocorax aristotelis · Central Norway · Diet · Fish stock recruitment indicator · Pollachius virens publishedVersion © The authors 2018. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are unrestricted. Authors and original publication must be credited. Article in Journal/Newspaper Arctic NTNU Open Archive (Norwegian University of Science and Technology) Arctic Norway Marine Ecology Progress Series 586 193 201 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
spellingShingle |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Lorentsen, Svein Håkon Anker-Nilssen, Tycho Erikstad, Kjell E Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment |
topic_facet |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
description |
In fisheries management, assessing year-class strength and recruitment to commercial stocks is essential, but can be difficult to do for fish species where the young stages are inaccessible to ship-based surveys. This is true for the northeast Arctic saithe Pollachius virens, where the juveniles spend their first years in coastal kelp forests and therefore cannot be assessed before they enter the pelagic stock at 3 yr of age. However, as top predators in marine ecosystems, coastal seabirds might prey on the same cohort 2−3 yr earlier. Long-term studies of European shag Phalacrocorax aristotelis at a colony in central Norway have revealed strong links between the birds’ breeding performance and the availability of 0 and 1 yr old saithe in their diet. Following this, we wanted to explore if shag diet can be used as an early indicator of saithe recruitment by comparing it with abundance indices obtained by fisheries research. Our results indicate that the occurrence of 0 yr old saithe in the shag diet is a poor predictor of saithe recruitment 3 yr later. However, both the pre- and post-hatch biomass and the number and frequency of occurrence of 1 yr old saithe show a strong positive relationship with indices obtained from scientific surveys 2 yr later, indicating that shag diet can be used as an early and reasonably reliable predictor of saithe recruitment. We suggest implementing the occurrence of 1 yr old saithe in the shag diet as a supplementary tool for an adaptive management of the fisheries on young saithe. Phalacrocorax aristotelis · Central Norway · Diet · Fish stock recruitment indicator · Pollachius virens publishedVersion © The authors 2018. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are unrestricted. Authors and original publication must be credited. |
format |
Article in Journal/Newspaper |
author |
Lorentsen, Svein Håkon Anker-Nilssen, Tycho Erikstad, Kjell E |
author_facet |
Lorentsen, Svein Håkon Anker-Nilssen, Tycho Erikstad, Kjell E |
author_sort |
Lorentsen, Svein Håkon |
title |
Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment |
title_short |
Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment |
title_full |
Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment |
title_fullStr |
Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment |
title_full_unstemmed |
Seabirds as guides for fisheries management: European shag Phalacrocorax aristotelis diet as indicator of saithe Pollachius virens recruitment |
title_sort |
seabirds as guides for fisheries management: european shag phalacrocorax aristotelis diet as indicator of saithe pollachius virens recruitment |
publisher |
Inter-Research |
publishDate |
2018 |
url |
http://hdl.handle.net/11250/2483030 https://doi.org/10.3354/meps12440 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
193-201 586 Marine Ecology Progress Series |
op_relation |
Andre: Norwegian Ministry of Climate and Environment Andre: Norwegian Environment Agency Andre: Norwegian Ministry of Petroleum and Energy Marine Ecology Progress Series. 2018, 586, 193-201. urn:issn:0171-8630 http://hdl.handle.net/11250/2483030 https://doi.org/10.3354/meps12440 cristin:1543091 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3354/meps12440 |
container_title |
Marine Ecology Progress Series |
container_volume |
586 |
container_start_page |
193 |
op_container_end_page |
201 |
_version_ |
1766346574473986048 |