Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans
In the frame of the Ecosystem Approach to Fishery (EAF) management, impact of the tropical tuna purse-seine fishery on targeted and incidentally captured species should be investigated. They may include megafauna species, such as sharks, rays, cetaceans, turtles or sea birds, which often are emblema...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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2016
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Online Access: | https://tel.archives-ouvertes.fr/tel-01647177 https://tel.archives-ouvertes.fr/tel-01647177/document https://tel.archives-ouvertes.fr/tel-01647177/file/2016_ESCALLE_archivage.pdf |
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ftunivnantes:oai:HAL:tel-01647177v1 2023-05-15T15:37:09+02:00 Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans Interactions spatio-temporelles entre requins baleines, cétacés et pêche thonière tropicale à la senne dans une perspective de conservation, dans les océans Atlantique et Indien Escalle, Lauriane MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Université Montpellier Daniel Gaertner Bastien Merigot 2016-09-22 https://tel.archives-ouvertes.fr/tel-01647177 https://tel.archives-ouvertes.fr/tel-01647177/document https://tel.archives-ouvertes.fr/tel-01647177/file/2016_ESCALLE_archivage.pdf en eng HAL CCSD NNT: 2016MONTT125 tel-01647177 https://tel.archives-ouvertes.fr/tel-01647177 https://tel.archives-ouvertes.fr/tel-01647177/document https://tel.archives-ouvertes.fr/tel-01647177/file/2016_ESCALLE_archivage.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-01647177 Animal biology. Université Montpellier, 2016. English. ⟨NNT : 2016MONTT125⟩ Whale shark Cetaceans Tuna purse-Seine fishery Marine magafauna Accidental catch Pelagic ecosystems Requin baleine Cétacés Pêche thonière à la senne Megafaune marine Prises accessoires Écosystèmes pélagiques [SDV.BA]Life Sciences [q-bio]/Animal biology info:eu-repo/semantics/doctoralThesis Theses 2016 ftunivnantes 2022-11-09T01:58:49Z In the frame of the Ecosystem Approach to Fishery (EAF) management, impact of the tropical tuna purse-seine fishery on targeted and incidentally captured species should be investigated. They may include megafauna species, such as sharks, rays, cetaceans, turtles or sea birds, which often are emblematic and vulnerable species. Tropical tuna purse-seiners actively search, at the surface of the sea, for clues indicating the presence of tuna schools (e.g. birds, floating objects, whales, dolphins or whale sharks). In the eastern Atlantic and western Indian Oceans, the main two fishing modes are sets on free swimming tuna schools and schools associated to natural or artificial floating objects, thereafter called Fish Aggregating Device (FAD). However dedicated studies on fishing sets associated to whale sharks and cetaceans are still lacking. The aim of this thesis is therefore, using logbook and scientific onboard observer data, to investigate the spatio-temporal co-occurrences and/or interactions between whale sharks, cetaceans and the tuna purse-seine fishery within an ecosystem conservation perspective. This work underlines that the megafauna/ fishery co-occurrence occurs in specific spatio-temporal strata: i) Gabon to Angola (April–September), ii) the Mozambique Channel (June–September), and iii) East of Seychelles (April–September). As baleen whales and whale sharks are filter feeders, the co-occurrence with the purse-seine fishery was mostly linked to highly productive environments (i.e. using proxys including chlorophyll-a concentration). In addition fishing sets involving megafauna were relatively high before 2000 (up to 20% of the sets), but are nowadays less frequent (AC3 and 1.5% of the sets associated to baleen whales and whale sharks). The purse-seine fishery appears to have a relatively low impact on megafauna species with mortality rates of 1.4% for whale sharks and 5.6% for cetaceans. Whale shark satellite tagging also confirms these results on the longer term, but the low sample size precludes any ... Doctoral or Postdoctoral Thesis baleen whales Université de Nantes: HAL-UNIV-NANTES Baleine ENVELOPE(140.012,140.012,-66.649,-66.649) Indian |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Whale shark Cetaceans Tuna purse-Seine fishery Marine magafauna Accidental catch Pelagic ecosystems Requin baleine Cétacés Pêche thonière à la senne Megafaune marine Prises accessoires Écosystèmes pélagiques [SDV.BA]Life Sciences [q-bio]/Animal biology |
spellingShingle |
Whale shark Cetaceans Tuna purse-Seine fishery Marine magafauna Accidental catch Pelagic ecosystems Requin baleine Cétacés Pêche thonière à la senne Megafaune marine Prises accessoires Écosystèmes pélagiques [SDV.BA]Life Sciences [q-bio]/Animal biology Escalle, Lauriane Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans |
topic_facet |
Whale shark Cetaceans Tuna purse-Seine fishery Marine magafauna Accidental catch Pelagic ecosystems Requin baleine Cétacés Pêche thonière à la senne Megafaune marine Prises accessoires Écosystèmes pélagiques [SDV.BA]Life Sciences [q-bio]/Animal biology |
description |
In the frame of the Ecosystem Approach to Fishery (EAF) management, impact of the tropical tuna purse-seine fishery on targeted and incidentally captured species should be investigated. They may include megafauna species, such as sharks, rays, cetaceans, turtles or sea birds, which often are emblematic and vulnerable species. Tropical tuna purse-seiners actively search, at the surface of the sea, for clues indicating the presence of tuna schools (e.g. birds, floating objects, whales, dolphins or whale sharks). In the eastern Atlantic and western Indian Oceans, the main two fishing modes are sets on free swimming tuna schools and schools associated to natural or artificial floating objects, thereafter called Fish Aggregating Device (FAD). However dedicated studies on fishing sets associated to whale sharks and cetaceans are still lacking. The aim of this thesis is therefore, using logbook and scientific onboard observer data, to investigate the spatio-temporal co-occurrences and/or interactions between whale sharks, cetaceans and the tuna purse-seine fishery within an ecosystem conservation perspective. This work underlines that the megafauna/ fishery co-occurrence occurs in specific spatio-temporal strata: i) Gabon to Angola (April–September), ii) the Mozambique Channel (June–September), and iii) East of Seychelles (April–September). As baleen whales and whale sharks are filter feeders, the co-occurrence with the purse-seine fishery was mostly linked to highly productive environments (i.e. using proxys including chlorophyll-a concentration). In addition fishing sets involving megafauna were relatively high before 2000 (up to 20% of the sets), but are nowadays less frequent (AC3 and 1.5% of the sets associated to baleen whales and whale sharks). The purse-seine fishery appears to have a relatively low impact on megafauna species with mortality rates of 1.4% for whale sharks and 5.6% for cetaceans. Whale shark satellite tagging also confirms these results on the longer term, but the low sample size precludes any ... |
author2 |
MARine Biodiversity Exploitation and Conservation (UMR MARBEC) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Université Montpellier Daniel Gaertner Bastien Merigot |
format |
Doctoral or Postdoctoral Thesis |
author |
Escalle, Lauriane |
author_facet |
Escalle, Lauriane |
author_sort |
Escalle, Lauriane |
title |
Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans |
title_short |
Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans |
title_full |
Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans |
title_fullStr |
Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans |
title_full_unstemmed |
Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans |
title_sort |
spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the atlantic and indian oceans |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://tel.archives-ouvertes.fr/tel-01647177 https://tel.archives-ouvertes.fr/tel-01647177/document https://tel.archives-ouvertes.fr/tel-01647177/file/2016_ESCALLE_archivage.pdf |
long_lat |
ENVELOPE(140.012,140.012,-66.649,-66.649) |
geographic |
Baleine Indian |
geographic_facet |
Baleine Indian |
genre |
baleen whales |
genre_facet |
baleen whales |
op_source |
https://tel.archives-ouvertes.fr/tel-01647177 Animal biology. Université Montpellier, 2016. English. ⟨NNT : 2016MONTT125⟩ |
op_relation |
NNT: 2016MONTT125 tel-01647177 https://tel.archives-ouvertes.fr/tel-01647177 https://tel.archives-ouvertes.fr/tel-01647177/document https://tel.archives-ouvertes.fr/tel-01647177/file/2016_ESCALLE_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766367609892110336 |