Predicting the population‐level impact of mitigating harbor porpoise bycatch with pingers and time‐area fishing closures
Abstract 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 smal...
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ftdoajarticles:oai:doaj.org/article:515602fdb7624fa3922bbf59614292dd 2023-05-15T17:59:14+02:00 Predicting the population‐level impact of mitigating harbor porpoise bycatch with pingers and time‐area fishing closures Floris M. vanBeest Lotte Kindt‐Larsen Francois Bastardie Valerio Bartolino Jacob Nabe‐Nielsen 2017-04-01T00:00:00Z https://doi.org/10.1002/ecs2.1785 https://doaj.org/article/515602fdb7624fa3922bbf59614292dd EN eng Wiley https://doi.org/10.1002/ecs2.1785 https://doaj.org/toc/2150-8925 2150-8925 doi:10.1002/ecs2.1785 https://doaj.org/article/515602fdb7624fa3922bbf59614292dd Ecosphere, Vol 8, Iss 4, Pp n/a-n/a (2017) acoustic alarms agent‐based model bycatch cetaceans disturbance gillnet fisheries Ecology QH540-549.5 article 2017 ftdoajarticles https://doi.org/10.1002/ecs2.1785 2022-12-31T01:22:18Z Abstract 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 ... Article in Journal/Newspaper Phocoena phocoena Directory of Open Access Journals: DOAJ Articles Ecosphere 8 4 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
acoustic alarms agent‐based model bycatch cetaceans disturbance gillnet fisheries Ecology QH540-549.5 |
spellingShingle |
acoustic alarms agent‐based model bycatch cetaceans disturbance gillnet fisheries Ecology QH540-549.5 Floris M. vanBeest Lotte Kindt‐Larsen Francois Bastardie Valerio Bartolino Jacob Nabe‐Nielsen Predicting the population‐level impact of mitigating harbor porpoise bycatch with pingers and time‐area fishing closures |
topic_facet |
acoustic alarms agent‐based model bycatch cetaceans disturbance gillnet fisheries Ecology QH540-549.5 |
description |
Abstract 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 ... |
format |
Article in Journal/Newspaper |
author |
Floris M. vanBeest Lotte Kindt‐Larsen Francois Bastardie Valerio Bartolino Jacob Nabe‐Nielsen |
author_facet |
Floris M. vanBeest Lotte Kindt‐Larsen Francois Bastardie Valerio Bartolino Jacob Nabe‐Nielsen |
author_sort |
Floris M. vanBeest |
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 |
publisher |
Wiley |
publishDate |
2017 |
url |
https://doi.org/10.1002/ecs2.1785 https://doaj.org/article/515602fdb7624fa3922bbf59614292dd |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Ecosphere, Vol 8, Iss 4, Pp n/a-n/a (2017) |
op_relation |
https://doi.org/10.1002/ecs2.1785 https://doaj.org/toc/2150-8925 2150-8925 doi:10.1002/ecs2.1785 https://doaj.org/article/515602fdb7624fa3922bbf59614292dd |
op_doi |
https://doi.org/10.1002/ecs2.1785 |
container_title |
Ecosphere |
container_volume |
8 |
container_issue |
4 |
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1766168015572828160 |