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Auteur (up) Fromentin, J.-M.; Bonhommeau, S.; Arrizabalaga, H.; Kell, L.T.
Titre The spectre of uncertainty in management of exploited fish stocks: The illustrative case of Atlantic bluefin tuna Type Article scientifique
Année 2014 Publication Revue Abrégée Marine Policy
Volume 47 Numéro Pages 8-14
Mots-Clés tuna
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ISSN 0308-597x ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 323
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Auteur (up) FROMENTIN, J.-M.; LOPUSZANSKI, D.
Titre Migration, residency, and homing of bluefin tuna in the western Mediterranean Sea Type Article scientifique
Année 2014 Publication Revue Abrégée ICES Journal of Marine Science
Volume 71 Numéro 3 Pages 510-518
Mots-Clés feeding area; front; marine protected area; pop-up archival tag; Spatial distribution; Thunnus thynnus
Résumé This study presents the results of an electronic tagging programme on mature Atlantic bluefin tuna (ABFT) that has been conducted since 2007 offshore of the French Mediterranean Coast. The spatial distributions of ABFT showed little year-to-year variation and the fish concentrated in a small area of the central northwestern Mediterranean, where they may stay for several months. The individual tracks display sinuous trajectories in this area, indicating the possibility of feeding behaviour. No fish went out to the North Atlantic, but several fish displayed some migration to the southern western Mediterranean Sea during winter and the central Mediterranean during the spawning season. The homing behaviour of one fish after a full year as well as the back and forth of several fish further indicates that this restricted feeding area is probably persistent from year to year. We hypothesize that this area could result from local enrichment due to permanent mesoscale oceanographic features related to the North Mediterranean Current and the North Balearic front. The option of a spatial management, through marine protected areas, for a highly migratory species, such as ABFT, thus deserves more careful consideration because those species displayed complex spatial dynamics (e.g. homing), and population structure (e.g. several subpopulations of different sizes).
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ISSN 1054-3139 ISBN Médium
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Notes The following values have no corresponding Zotero field:<br/>Author Address: IFREMER, UMR 212 EME, Avenue Jean Monnet, BP 171, 34203 Se`te, France<br/>Author Address: BGFCF, (Big Game Fishing Club France), Carry le Rouet 13620, France<br/>PB – Oxford university press<br/> Approuvé pas de
Numéro d'Appel LL @ pixluser @ collection 339
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Auteur (up) FROMENTIN, J.-M.; REYGONDEAU, G.; BONHOMMEAU, S.; BEAUGRAND, G.
Titre Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) Type Article scientifique
Année 2014 Publication Revue Abrégée Fisheries Oceanography
Volume 23 Numéro 2 Pages 147-156
Mots-Clés ecological niche model; longline fisheries; Migration; synergistic effects; Thunnus thynnus; time series
Résumé Atlantic bluefin tuna (ABFT) has always displayed spectacular changes in its spatial distribution, but the underlying mechanism of such variations still remains obscure. This study focuses on this challenging issue by scrutinizing the intriguing ‘Brazilian episode’ during which a large quantity of ABFT (a temperate species) was caught during the 1960s in the equatorial Atlantic. To investigate this event, we applied a niche model to an extensive data set of catch and environmental variables from 1960 to 2009. ABFT exhibited a remarkably large ecological niche, which matches well with our current knowledge of ABFT. Our results also depicted a high probability of ABFT occurrence in the South Atlantic and, more interestingly, favorable environmental conditions in the western equatorial Atlantic during the 1960s, but not later. ABFT could thus have migrated from their northern spawning grounds to the South Atlantic during the 1960s through the western equatorial Atlantic, playing the role of an ‘ecological bridge’. We argue that the rarity of ABFT in the southern Atlantic during the last four decades would result from the interaction of several processes, particularly oceanographic conditions, migratory behavior, density-dependence, exploitation levels and population structure. Examination of the catch data further indicated that the fish caught in the equatorial Atlantic were from the western stock and we concluded that the lack of rebuilding of this stock could result from a regime shift due to the combination of oceanographic changes in the equatorial Atlantic and overfishing in the North Atlantic in the 1960s and 1970s.
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ISSN 1054-6006 ISBN Médium
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Notes <p>The following values have no corresponding Zotero field:<br />Author Address: Ifremer Inst Francais Rech Exploitat Mer, UMR EME 212, F-34203 Sete, France.<br />Author Address: IRD, UMR EME 212, F-34203 Sete, France.<br />Author Address: CNRS, UMR LOG 8187, F-62930 Wimereux, France.<br />PB – Wiley-blackwell</p> Approuvé pas de
Numéro d'Appel LL @ pixluser @ collection 340
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Auteur (up) Galletti, F.
Titre La protection juridique des réseaux écologiques marins. Compétences et implications du droit de la mer contemporain Type Chapitre de livre
Année 2014 Publication Revue Abrégée
Volume Numéro Pages 765-791
Mots-Clés Droit de l'environnement; Droit international de la mer; Droit public; Etat; Gouvernance; Réseaux écologiques marins
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Editeur Editoriale Scientifica Lieu de Publication Napoli Éditeur
Langue Fre Langue du Résumé Titre Original
Éditeur de collection Titre de collection Titre de collection Abrégé La contribution de la Convention des Nations Unies sur le Droit de la Mer à la bonne gouvernance des
Volume de collection Vol. 2 Numéro de collection 2 Edition
ISSN ISBN 978-88-6342-638-0 Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1614
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Auteur (up) Garavelli, L.; Kaplan, D.; Colas, F.; Stotz, W.; Yannicelli, B.; Lett, C.
Titre Identifying appropriate spatial scales for marine conservation and management using a larval dispersal model : the case of Concholepas concholepas (loco) in Chile Type Article scientifique
Année 2014 Publication Revue Abrégée Progress in Oceanography
Volume 124 Numéro Pages 42-53
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Résumé Along the coast of Chile, fisheries targeting the marine gastropod Concholepas concholepas, commonly named “loco”, were highly valuable until the end of the 80s when catches declined significantly. Since the late 90s, a management plan based on territorial-user-rights areas has been implemented, with limited effect on stock recovery. More effective loco conservation and management is impeded by lack of information regarding connectivity via larval dispersal between these individually-managed areas. To develop a regional view of loco connectivity, we integrate loco life history information into a biophysical, individual-based larval dispersal model. This model is used to evaluate scales of loco connectivity and seasonality in connectivity patterns, as well as to partition the coast into largely disconnected subpopulations using a recently developed connectivity-matrix clustering algorithm. We find mean dispersal distances ranging from 170 to 220 km depending on release depth of larvae and planktonic larval duration. Settlement success levels depend quantitatively on the physical and biological processes included in the model, but connectivity patterns remain qualitatively similar. Model estimates of settlement success peak for larval release dates in late austral autumn, consistent with field results and with favorable conditions for larval coastal retention due to weak upwelling during austral autumn. Despite the relatively homogeneous Chilean coastline, distinct subpopulations with minimal connectivity between them are readily identifiable. Barriers to connectivity that are robust to changes in model configuration exist at 23 degrees S and 29 degrees S latitudes. These zones are all associated with important headlands and embayments of the Chilean coast.
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ISSN 0079-6611 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 359
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