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 socio-economic 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...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
NRC Research Press (a division of Canadian Science Publishing)
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/1807/82279 http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2016-0498 |
id |
ftunivtoronto:oai:localhost:1807/82279 |
---|---|
record_format |
openpolar |
spelling |
ftunivtoronto:oai:localhost:1807/82279 2023-05-15T17:53:55+02:00 Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes. Richard, Gaëtan Guinet, Christophe Bonnel, Julien Gasco , Nicolas Tixier, Paul 2017-07-22 http://hdl.handle.net/1807/82279 http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2016-0498 unknown NRC Research Press (a division of Canadian Science Publishing) 0706-652X http://hdl.handle.net/1807/82279 http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2016-0498 Article 2017 ftunivtoronto 2020-06-17T12:10:25Z Depredation in longline fisheries by odontocete whales is a worldwide growing issue, having substantial socio-economic 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 maximising the exploitation of the resources, we highlight possible risks for the long-term sustainability of the local ecosystems. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. Article in Journal/Newspaper Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus University of Toronto: Research Repository T-Space Indian Kerguelen Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
description |
Depredation in longline fisheries by odontocete whales is a worldwide growing issue, having substantial socio-economic 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 maximising the exploitation of the resources, we highlight possible risks for the long-term sustainability of the local ecosystems. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. |
format |
Article in Journal/Newspaper |
author |
Richard, Gaëtan Guinet, Christophe Bonnel, Julien Gasco , Nicolas Tixier, Paul |
spellingShingle |
Richard, Gaëtan Guinet, Christophe Bonnel, Julien Gasco , Nicolas Tixier, Paul Do commercial fisheries display optimal foraging? The case of longline fishers in competition with odontocetes. |
author_facet |
Richard, Gaëtan Guinet, Christophe Bonnel, Julien Gasco , Nicolas Tixier, Paul |
author_sort |
Richard, Gaëtan |
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. |
publisher |
NRC Research Press (a division of Canadian Science Publishing) |
publishDate |
2017 |
url |
http://hdl.handle.net/1807/82279 http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2016-0498 |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) |
geographic |
Indian Kerguelen Kerguelen Island |
geographic_facet |
Indian Kerguelen Kerguelen Island |
genre |
Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
genre_facet |
Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
op_relation |
0706-652X http://hdl.handle.net/1807/82279 http://www.nrcresearchpress.com/doi/abs/10.1139/cjfas-2016-0498 |
_version_ |
1766161632406274048 |