Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery
Beachcast events, where a large number of seabird carcasses drift ashore, occur with irregular intervals. These events are due to specific situations where mass mortality of seabirds have occurred. Disentangling the cause of these events can provide valuable information on stressors impacting seabir...
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Online Access: | https://hdl.handle.net/11250/3010813 https://doi.org/10.1016/j.marenvres.2022.105625 |
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ftninstnf:oai:brage.nina.no:11250/3010813 2023-05-15T17:43:34+02:00 Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery Christensen-Dalsgaard, Signe Ytrehus, Bjørnar Langset, Magdalene Wiig, Jørgen Ree Bærum, Kim Magnus 2022 application/pdf https://hdl.handle.net/11250/3010813 https://doi.org/10.1016/j.marenvres.2022.105625 eng eng Andre: Norwegian Oil and Gas Association Andre: Norwegian Ministry of Climate and Environment Norges forskningsråd: 192141 Andre: Norwegian Environment Agency Andre: Norwegian Ministry of Petroleum and Energy urn:issn:0141-1136 https://hdl.handle.net/11250/3010813 https://doi.org/10.1016/j.marenvres.2022.105625 cristin:2019276 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2022 The Authors CC-BY 177 Marine Environmental Research 105625 Coastal waters Fisheries interaction Mortality Necropsies Observer programme Gulls Laridae Stranding's VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Peer reviewed Journal article 2022 ftninstnf https://doi.org/10.1016/j.marenvres.2022.105625 2022-08-10T22:43:18Z Beachcast events, where a large number of seabird carcasses drift ashore, occur with irregular intervals. These events are due to specific situations where mass mortality of seabirds have occurred. Disentangling the cause of these events can provide valuable information on stressors impacting seabird populations. Following several mass mortality events involving gulls in northern Norway, an investigation of the probable cause of death was initiated. In total 75 dead gulls were collected at two occasions and necropsies were carried out. The findings from the necropsy of the gulls were consistent with drowning as the primary cause of death. Bycatch in coastal purse seine fishery was considered a potential cause of the mortality and monitoring of seabird bycatch in this fishery was thus initiated. The monitoring of fishing operations revealed that 10% of 91 fishing events observed led to bycatch, with a total of 32 bycaught seabirds. These bycatch events resulted in a total estimated bycatch rate of 0.356 (95% CI = 0.133–0.949) birds per haul. These findings are consistent with the hypothesis that the registered mortality events were caused by bycatch in the purse seine fishery. The highly episodic and unpredictable nature of these events makes it demanding to achieve solid estimates of the occurrence and extent of bycatch without a very high monitoring effort. Our study shows that systematic investigation following beachcast events can shed light on the occurrence of such extreme events. Coastal waters Fisheries interaction Gulls Laridae Mortality Necropsies Observer programme Stranding’s publishedVersion Article in Journal/Newspaper Northern Norway Norwegian Institute for Nature Research: Brage NINA Norway Marine Environmental Research 177 105625 |
institution |
Open Polar |
collection |
Norwegian Institute for Nature Research: Brage NINA |
op_collection_id |
ftninstnf |
language |
English |
topic |
Coastal waters Fisheries interaction Mortality Necropsies Observer programme Gulls Laridae Stranding's VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
spellingShingle |
Coastal waters Fisheries interaction Mortality Necropsies Observer programme Gulls Laridae Stranding's VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Christensen-Dalsgaard, Signe Ytrehus, Bjørnar Langset, Magdalene Wiig, Jørgen Ree Bærum, Kim Magnus Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery |
topic_facet |
Coastal waters Fisheries interaction Mortality Necropsies Observer programme Gulls Laridae Stranding's VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
description |
Beachcast events, where a large number of seabird carcasses drift ashore, occur with irregular intervals. These events are due to specific situations where mass mortality of seabirds have occurred. Disentangling the cause of these events can provide valuable information on stressors impacting seabird populations. Following several mass mortality events involving gulls in northern Norway, an investigation of the probable cause of death was initiated. In total 75 dead gulls were collected at two occasions and necropsies were carried out. The findings from the necropsy of the gulls were consistent with drowning as the primary cause of death. Bycatch in coastal purse seine fishery was considered a potential cause of the mortality and monitoring of seabird bycatch in this fishery was thus initiated. The monitoring of fishing operations revealed that 10% of 91 fishing events observed led to bycatch, with a total of 32 bycaught seabirds. These bycatch events resulted in a total estimated bycatch rate of 0.356 (95% CI = 0.133–0.949) birds per haul. These findings are consistent with the hypothesis that the registered mortality events were caused by bycatch in the purse seine fishery. The highly episodic and unpredictable nature of these events makes it demanding to achieve solid estimates of the occurrence and extent of bycatch without a very high monitoring effort. Our study shows that systematic investigation following beachcast events can shed light on the occurrence of such extreme events. Coastal waters Fisheries interaction Gulls Laridae Mortality Necropsies Observer programme Stranding’s publishedVersion |
format |
Article in Journal/Newspaper |
author |
Christensen-Dalsgaard, Signe Ytrehus, Bjørnar Langset, Magdalene Wiig, Jørgen Ree Bærum, Kim Magnus |
author_facet |
Christensen-Dalsgaard, Signe Ytrehus, Bjørnar Langset, Magdalene Wiig, Jørgen Ree Bærum, Kim Magnus |
author_sort |
Christensen-Dalsgaard, Signe |
title |
Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery |
title_short |
Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery |
title_full |
Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery |
title_fullStr |
Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery |
title_full_unstemmed |
Seabird beachcast events associated with bycatch in the Norwegian purse seine fishery |
title_sort |
seabird beachcast events associated with bycatch in the norwegian purse seine fishery |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3010813 https://doi.org/10.1016/j.marenvres.2022.105625 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
177 Marine Environmental Research 105625 |
op_relation |
Andre: Norwegian Oil and Gas Association Andre: Norwegian Ministry of Climate and Environment Norges forskningsråd: 192141 Andre: Norwegian Environment Agency Andre: Norwegian Ministry of Petroleum and Energy urn:issn:0141-1136 https://hdl.handle.net/11250/3010813 https://doi.org/10.1016/j.marenvres.2022.105625 cristin:2019276 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2022 The Authors |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.marenvres.2022.105625 |
container_title |
Marine Environmental Research |
container_volume |
177 |
container_start_page |
105625 |
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1766145678157807616 |