Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures
Unintentional mortality of higher trophic-level species in commercial fisheries (bycatch) represents a major conservation concern as it may influence the long-term persistence of populations. An increasingly common strategy to mitigate bycatch of harbor porpoises (Phocoena phocoena), a small and pro...
Published in: | Ecosphere |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://orbit.dtu.dk/en/publications/137d3e24-a05a-4f30-b10d-9a1ff80a97c4 https://doi.org/10.1002/ecs2.1785 https://backend.orbit.dtu.dk/ws/files/131405543/Publishers_version.pdf http://onlinelibrary.wiley.com/doi/10.1002/ecs2.1785/abstract |
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ftdtupubl:oai:pure.atira.dk:publications/137d3e24-a05a-4f30-b10d-9a1ff80a97c4 2024-05-19T07:47:23+00:00 Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures van Beest, Floris Kindt-Larsen, Lotte Bastardie, Francois Bartolino, Valerio Nielsen, Jacob Nabe 2017 application/pdf https://orbit.dtu.dk/en/publications/137d3e24-a05a-4f30-b10d-9a1ff80a97c4 https://doi.org/10.1002/ecs2.1785 https://backend.orbit.dtu.dk/ws/files/131405543/Publishers_version.pdf http://onlinelibrary.wiley.com/doi/10.1002/ecs2.1785/abstract eng eng https://orbit.dtu.dk/en/publications/137d3e24-a05a-4f30-b10d-9a1ff80a97c4 info:eu-repo/semantics/openAccess van Beest , F , Kindt-Larsen , L , Bastardie , F , Bartolino , V & Nielsen , J N 2017 , ' Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures ' , Ecosphere (Washington, D.C.) , vol. 8 , no. 4 , e01785 . https://doi.org/10.1002/ecs2.1785 /dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2017 ftdtupubl https://doi.org/10.1002/ecs2.1785 2024-05-01T00:24:54Z Unintentional mortality of higher trophic-level species in commercial fisheries (bycatch) represents a major conservation concern as it may influence the long-term persistence of populations. An increasingly common strategy to mitigate bycatch of harbor porpoises (Phocoena phocoena), a small and protected marine top predator, involves the use of pingers (acoustic alarms that emit underwater noise) and time-area fishing closures. Although these mitigation measures can reduce harbor porpoise bycatch in gillnet fisheries considerably, inference about the long-term population-level consequences is currently lacking. We developed a spatially explicit individual-based simulation model (IBM) with the aim to evaluate the effectiveness of these two bycatch mitigation measures. We quantified both the direct positive effects (i.e., reduced bycatch) and any indirect negative effects (i.e., reduced foraging efficiency) on the population size using the inner Danish waters as a biological system. The model incorporated empirical data on gillnet fishing effort and noise avoidance behavior by free-ranging harbor porpoises exposed to randomized high-frequency (20- to 160-kHz) pinger signals. The IBM simulations revealed a synergistic relationship between the implementation of time-area fishing closures and pinger deployment. Time-area fishing closures reduced bycatch rates substantially but not completely. In contrast, widespread pinger deployment resulted in total mitigation of bycatch but frequent and recurrent noise avoidance behavior in high-quality foraging habitat negatively affected individual survival and the total population size. When both bycatch mitigation measures were implemented simultaneously, the negative impact of pinger noise-induced sub-lethal behavioral effects on the population was largely eliminated with a positive effect on the population size that was larger than when the mitigation measures were used independently. Our study highlights that conservationists and policy makers need to consider and balance ... Article in Journal/Newspaper Phocoena phocoena Technical University of Denmark: DTU Orbit Ecosphere 8 4 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water van Beest, Floris Kindt-Larsen, Lotte Bastardie, Francois Bartolino, Valerio Nielsen, Jacob Nabe Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
Unintentional mortality of higher trophic-level species in commercial fisheries (bycatch) represents a major conservation concern as it may influence the long-term persistence of populations. An increasingly common strategy to mitigate bycatch of harbor porpoises (Phocoena phocoena), a small and protected marine top predator, involves the use of pingers (acoustic alarms that emit underwater noise) and time-area fishing closures. Although these mitigation measures can reduce harbor porpoise bycatch in gillnet fisheries considerably, inference about the long-term population-level consequences is currently lacking. We developed a spatially explicit individual-based simulation model (IBM) with the aim to evaluate the effectiveness of these two bycatch mitigation measures. We quantified both the direct positive effects (i.e., reduced bycatch) and any indirect negative effects (i.e., reduced foraging efficiency) on the population size using the inner Danish waters as a biological system. The model incorporated empirical data on gillnet fishing effort and noise avoidance behavior by free-ranging harbor porpoises exposed to randomized high-frequency (20- to 160-kHz) pinger signals. The IBM simulations revealed a synergistic relationship between the implementation of time-area fishing closures and pinger deployment. Time-area fishing closures reduced bycatch rates substantially but not completely. In contrast, widespread pinger deployment resulted in total mitigation of bycatch but frequent and recurrent noise avoidance behavior in high-quality foraging habitat negatively affected individual survival and the total population size. When both bycatch mitigation measures were implemented simultaneously, the negative impact of pinger noise-induced sub-lethal behavioral effects on the population was largely eliminated with a positive effect on the population size that was larger than when the mitigation measures were used independently. Our study highlights that conservationists and policy makers need to consider and balance ... |
format |
Article in Journal/Newspaper |
author |
van Beest, Floris Kindt-Larsen, Lotte Bastardie, Francois Bartolino, Valerio Nielsen, Jacob Nabe |
author_facet |
van Beest, Floris Kindt-Larsen, Lotte Bastardie, Francois Bartolino, Valerio Nielsen, Jacob Nabe |
author_sort |
van Beest, Floris |
title |
Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures |
title_short |
Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures |
title_full |
Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures |
title_fullStr |
Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures |
title_full_unstemmed |
Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures |
title_sort |
predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures |
publishDate |
2017 |
url |
https://orbit.dtu.dk/en/publications/137d3e24-a05a-4f30-b10d-9a1ff80a97c4 https://doi.org/10.1002/ecs2.1785 https://backend.orbit.dtu.dk/ws/files/131405543/Publishers_version.pdf http://onlinelibrary.wiley.com/doi/10.1002/ecs2.1785/abstract |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
van Beest , F , Kindt-Larsen , L , Bastardie , F , Bartolino , V & Nielsen , J N 2017 , ' Predicting the population-level impact of mitigating harbor porpoise bycatch with pingers and time-area fishing closures ' , Ecosphere (Washington, D.C.) , vol. 8 , no. 4 , e01785 . https://doi.org/10.1002/ecs2.1785 |
op_relation |
https://orbit.dtu.dk/en/publications/137d3e24-a05a-4f30-b10d-9a1ff80a97c4 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/ecs2.1785 |
container_title |
Ecosphere |
container_volume |
8 |
container_issue |
4 |
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1799487779758931968 |