Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes
Depredation in longline fisheries by odontocete whales is a worldwide growing issue, having substantial socioeconomic consequences for fishers as well as conservation implications for both fish resources and the depredating odontocete populations. An example of this is the demersal longline fishery...
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ftdeakinunifig:oai:figshare.com:article/20830426 2024-09-09T20:02:22+00:00 Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes G Richard C Guinet J Bonnel N Gasco P Tixier 2018-01-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30104298 https://figshare.com/articles/journal_contribution/Do_commercial_fisheries_display_optimal_foraging_The_case_of_longline_fishers_in_competition_with_odontocetes/20830426 unknown http://hdl.handle.net/10536/DRO/DU:30104298 https://figshare.com/articles/journal_contribution/Do_commercial_fisheries_display_optimal_foraging_The_case_of_longline_fishers_in_competition_with_odontocetes/20830426 All Rights Reserved Fisheries sciences not elsewhere classified Ecology not elsewhere classified Zoology not elsewhere classified fisheries odontocete whales depredation socioeconomic consequences Crozet Archipelago Kerguelen Island School of Life and Environmental Sciences 3005 Fisheries sciences 3103 Ecology 3109 Zoology Text Journal contribution 2018 ftdeakinunifig 2024-06-20T00:59:14Z Depredation in longline fisheries by odontocete whales is a worldwide growing issue, having substantial socioeconomic consequences for fishers as well as conservation implications for both fish resources and the depredating odontocete populations. An example of this is the demersal longline fishery operating around the Crozet Archipelago and Kerguelen Island, southern Indian Ocean, where killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus) depredate hooked Patagonian toothfish (Dissostichus eleginoides). It is of great interest to better understand relationships of this modern fishery with its environment. Thus, we examined the factors influencing the decision-making process of fishers facing such competition while operating on a patch. Using optimal foraging theory as the underlying hypothesis, we determined that the probability captains left an area decreases with increasing fishing success, whereas in presence of competition from odontocete whales, it increases. Our study provides strong support that fishers behave as optimal foragers in this specific fishery. Considering that captains are optimal foragers and thus aim at maximizing the exploitation of the resources, we highlight possible risks for the long-term sustainability of the local ecosystems. Article in Journal/Newspaper Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus DRO - Deakin Research Online Kerguelen Indian Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Fisheries sciences not elsewhere classified Ecology not elsewhere classified Zoology not elsewhere classified fisheries odontocete whales depredation socioeconomic consequences Crozet Archipelago Kerguelen Island School of Life and Environmental Sciences 3005 Fisheries sciences 3103 Ecology 3109 Zoology |
spellingShingle |
Fisheries sciences not elsewhere classified Ecology not elsewhere classified Zoology not elsewhere classified fisheries odontocete whales depredation socioeconomic consequences Crozet Archipelago Kerguelen Island School of Life and Environmental Sciences 3005 Fisheries sciences 3103 Ecology 3109 Zoology G Richard C Guinet J Bonnel N Gasco P Tixier Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes |
topic_facet |
Fisheries sciences not elsewhere classified Ecology not elsewhere classified Zoology not elsewhere classified fisheries odontocete whales depredation socioeconomic consequences Crozet Archipelago Kerguelen Island School of Life and Environmental Sciences 3005 Fisheries sciences 3103 Ecology 3109 Zoology |
description |
Depredation in longline fisheries by odontocete whales is a worldwide growing issue, having substantial socioeconomic consequences for fishers as well as conservation implications for both fish resources and the depredating odontocete populations. An example of this is the demersal longline fishery operating around the Crozet Archipelago and Kerguelen Island, southern Indian Ocean, where killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus) depredate hooked Patagonian toothfish (Dissostichus eleginoides). It is of great interest to better understand relationships of this modern fishery with its environment. Thus, we examined the factors influencing the decision-making process of fishers facing such competition while operating on a patch. Using optimal foraging theory as the underlying hypothesis, we determined that the probability captains left an area decreases with increasing fishing success, whereas in presence of competition from odontocete whales, it increases. Our study provides strong support that fishers behave as optimal foragers in this specific fishery. Considering that captains are optimal foragers and thus aim at maximizing the exploitation of the resources, we highlight possible risks for the long-term sustainability of the local ecosystems. |
format |
Article in Journal/Newspaper |
author |
G Richard C Guinet J Bonnel N Gasco P Tixier |
author_facet |
G Richard C Guinet J Bonnel N Gasco P Tixier |
author_sort |
G Richard |
title |
Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes |
title_short |
Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes |
title_full |
Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes |
title_fullStr |
Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes |
title_full_unstemmed |
Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes |
title_sort |
do commercial fisheries display optimal foraging? the case of longline fishers in competition with odontocetes |
publishDate |
2018 |
url |
http://hdl.handle.net/10536/DRO/DU:30104298 https://figshare.com/articles/journal_contribution/Do_commercial_fisheries_display_optimal_foraging_The_case_of_longline_fishers_in_competition_with_odontocetes/20830426 |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) |
geographic |
Kerguelen Indian Kerguelen Island |
geographic_facet |
Kerguelen Indian Kerguelen Island |
genre |
Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
genre_facet |
Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30104298 https://figshare.com/articles/journal_contribution/Do_commercial_fisheries_display_optimal_foraging_The_case_of_longline_fishers_in_competition_with_odontocetes/20830426 |
op_rights |
All Rights Reserved |
_version_ |
1809934326088859648 |