Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters
Overexploitation of fisheries resources leads to increasing competition between fisheries and marine biodiversity. This competition gives rise to depredation-type interactions (consumption of fish directly on the fishing gears by marine predators). Depredation has i) socio-economic consequences for...
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Other Authors: | , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2019
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Online Access: | https://hal.science/tel-04178074 https://hal.science/tel-04178074/document https://hal.science/tel-04178074/file/Janc%20%282019%29%20-%20Thesis%20manuscript.pdf |
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ftccsdartic:oai:HAL:tel-04178074v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Depredation sperm whales killer whales optimal foraging human behavioural ecology mitigation Déprédation cachalots orques approvisionnement optimal écologie comportementale humaine atténuation [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDV.SA.STP]Life Sciences [q-bio]/Agricultural sciences/Sciences and technics of fishery |
spellingShingle |
Depredation sperm whales killer whales optimal foraging human behavioural ecology mitigation Déprédation cachalots orques approvisionnement optimal écologie comportementale humaine atténuation [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDV.SA.STP]Life Sciences [q-bio]/Agricultural sciences/Sciences and technics of fishery Janc, Anaïs Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters |
topic_facet |
Depredation sperm whales killer whales optimal foraging human behavioural ecology mitigation Déprédation cachalots orques approvisionnement optimal écologie comportementale humaine atténuation [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDV.SA.STP]Life Sciences [q-bio]/Agricultural sciences/Sciences and technics of fishery |
description |
Overexploitation of fisheries resources leads to increasing competition between fisheries and marine biodiversity. This competition gives rise to depredation-type interactions (consumption of fish directly on the fishing gears by marine predators). Depredation has i) socio-economic consequences for fisheries (reduced yields); ii) ecological for marine predators (increased risk of bycatch or exposure to a lethal response) and iii) ecosystems (impacts on target and auxiliary resources). This thesis proposes to study, on one of the most lucrative fisheries, the most selective but also the most exposed to depredation, the decisional mechanisms (captains) and behavioural (marine predators) involved in the depredation exerted by the orcas (Orcinus orca) and sperm whales (Physeter macrocephalus) on the demersal longline fishery targeting Patagonian toothfish (Dissostichus eleginoides) in the French Exclusive Economic Zones of the Crozet and Kerguelen, Indian Ocean. By an original approach combining human and animal ethology against the backdrop of optimal foraging theory at two spatio-temporal scales, we show that i) this depredation is marked with a competition all the more important as the captains are experienced; (ii) odontocetes adjust their natural behaviour to benefit from the supply of food from the fisheries; (iii) no decision-making simultaneously allows high fishing yield and reduced depredation. These results highlight the importance of fisheries pressure on natural resources and the relevance of future bio economic and socio-ecosystem assessments to ensure the economic viability of fisheries and the sustainability of exploited and ancillary natural resources. La surexploitation des ressources halieutiques entraîne une compétition croissante entre les pêcheries et la biodiversité marine. Cette compétition donne lieu à des interactions de type depredation (consommation des poissons directement sur le matériel de pêche par les prédateurs marins). La déprédation engendre des conséquences i) socio-économiques ... |
author2 |
Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) La Rochelle Université Christophe Guinet Paul Tixier |
format |
Doctoral or Postdoctoral Thesis |
author |
Janc, Anaïs |
author_facet |
Janc, Anaïs |
author_sort |
Janc, Anaïs |
title |
Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters |
title_short |
Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters |
title_full |
Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters |
title_fullStr |
Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters |
title_full_unstemmed |
Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters |
title_sort |
fishing behaviours of skippers, killer whales orcinus orca and sperm whales physeter macrocephalus in the context of competition around the patagonian toothfish dissostichus eleginoides longline fishery in french sub-antarctic waters |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/tel-04178074 https://hal.science/tel-04178074/document https://hal.science/tel-04178074/file/Janc%20%282019%29%20-%20Thesis%20manuscript.pdf |
long_lat |
ENVELOPE(140.031,140.031,-66.669,-66.669) |
geographic |
Antarctic Indian Kerguelen Orques |
geographic_facet |
Antarctic Indian Kerguelen Orques |
genre |
Antarc* Antarctic Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
genre_facet |
Antarc* Antarctic Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus |
op_source |
https://hal.science/tel-04178074 Biodiversité et Ecologie. La Rochelle Université, 2019. Français. ⟨NNT : ⟩ |
op_relation |
tel-04178074 https://hal.science/tel-04178074 https://hal.science/tel-04178074/document https://hal.science/tel-04178074/file/Janc%20%282019%29%20-%20Thesis%20manuscript.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1792041946762444800 |
spelling |
ftccsdartic:oai:HAL:tel-04178074v1 2024-02-27T08:35:23+00:00 Fishing behaviours of skippers, killer whales Orcinus orca and sperm whales Physeter macrocephalus in the context of competition around the Patagonian toothfish Dissostichus eleginoides longline fishery in French sub-Antarctic waters Comportement des capitaines, des orques Orcinus orca et des cachalots Physeter macrocephalus dans le contexte de compétition autour de la pêcherie palangrière à la légine australe Dissostichus eleginoides dans les eaux subantarctiques françaises Janc, Anaïs Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) La Rochelle Université Christophe Guinet Paul Tixier 2019-12-20 https://hal.science/tel-04178074 https://hal.science/tel-04178074/document https://hal.science/tel-04178074/file/Janc%20%282019%29%20-%20Thesis%20manuscript.pdf fr fre HAL CCSD tel-04178074 https://hal.science/tel-04178074 https://hal.science/tel-04178074/document https://hal.science/tel-04178074/file/Janc%20%282019%29%20-%20Thesis%20manuscript.pdf info:eu-repo/semantics/OpenAccess https://hal.science/tel-04178074 Biodiversité et Ecologie. La Rochelle Université, 2019. Français. ⟨NNT : ⟩ Depredation sperm whales killer whales optimal foraging human behavioural ecology mitigation Déprédation cachalots orques approvisionnement optimal écologie comportementale humaine atténuation [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environment and Society [SDV.SA.STP]Life Sciences [q-bio]/Agricultural sciences/Sciences and technics of fishery info:eu-repo/semantics/doctoralThesis Theses 2019 ftccsdartic 2024-01-28T00:37:20Z Overexploitation of fisheries resources leads to increasing competition between fisheries and marine biodiversity. This competition gives rise to depredation-type interactions (consumption of fish directly on the fishing gears by marine predators). Depredation has i) socio-economic consequences for fisheries (reduced yields); ii) ecological for marine predators (increased risk of bycatch or exposure to a lethal response) and iii) ecosystems (impacts on target and auxiliary resources). This thesis proposes to study, on one of the most lucrative fisheries, the most selective but also the most exposed to depredation, the decisional mechanisms (captains) and behavioural (marine predators) involved in the depredation exerted by the orcas (Orcinus orca) and sperm whales (Physeter macrocephalus) on the demersal longline fishery targeting Patagonian toothfish (Dissostichus eleginoides) in the French Exclusive Economic Zones of the Crozet and Kerguelen, Indian Ocean. By an original approach combining human and animal ethology against the backdrop of optimal foraging theory at two spatio-temporal scales, we show that i) this depredation is marked with a competition all the more important as the captains are experienced; (ii) odontocetes adjust their natural behaviour to benefit from the supply of food from the fisheries; (iii) no decision-making simultaneously allows high fishing yield and reduced depredation. These results highlight the importance of fisheries pressure on natural resources and the relevance of future bio economic and socio-ecosystem assessments to ensure the economic viability of fisheries and the sustainability of exploited and ancillary natural resources. La surexploitation des ressources halieutiques entraîne une compétition croissante entre les pêcheries et la biodiversité marine. Cette compétition donne lieu à des interactions de type depredation (consommation des poissons directement sur le matériel de pêche par les prédateurs marins). La déprédation engendre des conséquences i) socio-économiques ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Orca Orcinus orca Patagonian Toothfish Physeter macrocephalus Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Indian Kerguelen Orques ENVELOPE(140.031,140.031,-66.669,-66.669) |