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Auteur Hori, M.; Hamaoka, H.; Hirota, M.; Lagarde, F.; Vaz, S.; Hamaguchi, M.; Hori, J.; Makino, M.
Titre Application of the coastal ecosystem complex concept toward integrated management for sustainable coastal fisheries under oligotrophication Type Article scientifique
Année 2018 Publication (up) Revue Abrégée Fish. Sci.
Volume 84 Numéro 2 Pages 283-292
Mots-Clés carbon; clam; diatoms; fatty-acid analyses; hinase; Indigenous and local knowledge; Integrated coastal management; invertebrates; japan; lagoon; Oyster aquaculture; Seagrass; shifts; stable-isotope
Résumé Harmonizing coastal fisheries with water-quality improvement has become an essential factor for the sustainable use of coastal ecosystem services. Here, we present the scope of our study based on an interdisciplinary approach including ecological actions, socio-economic actions and socio-psychological actions. We chose to focus on the interaction between oyster aquaculture and seagrass vegetation as a typical ecological action using the coastal ecosystem complex (CEC) concept. Coastal organisms have adapted their traits to the environment over a long period of time, so that restoration of the CEC represents reconstruction of the original process of coastal production. Subtidal seagrass vegetation with intertidal oyster reefs is the original CEC in Japan, which would be expected to enhance coastal production by improving the production efficiency without adding nutrients. A simple field experiment examining carbon and nitrogen contents and stable isotope ratios revealed that oyster spats cultivated on a tidal flat adjacent to seagrass beds had higher nitrogen contents and higher delta C-13 ratios than spats cultivated in an offshore area using only pelagic production. This result suggests that utilization of the CEC, which enables oysters to use both pelagic and benthic production, has potential to sustain a food provisioning service for humans, even in oligotrophic conditions.
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ISSN 0919-9268 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2326
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Auteur Torres-Irineo, E.; Dreyfus-Leon, M.; Gaertner, D.; Salas, S.; Marchal, P.
Titre Adaptive responses of tropical tuna purse-seiners under temporal regulations Type Article scientifique
Année 2017 Publication (up) Revue Abrégée Ambio
Volume 46 Numéro 1 Pages 88-97
Mots-Clés atlantic; behavior; Closed season; eastern pacific-ocean; eastern tropical pacific; Fisher behaviour; Fisheries management; fishing strategies; fleet dynamics; mixed fisheries; model; Purse-seine fishing; state; trawlers; Tropical tuna
Résumé The failure to achieve fisheries management objectives has been broadly discussed in international meetings. Measuring the effects of fishery regulations is difficult due to the lack of detailed information. The yellowfin tuna fishery in the eastern Pacific Ocean offers an opportunity to evaluate the fishers' responses to temporal regulations. We used data from observers on-board Mexican purse-seine fleet, which is the main fleet fishing on dolphin-associated tuna schools. In 2002, the Inter-American Tropical Tuna Commission implemented a closed season to reduce fishing effort for this fishery. For the period 1992-2008, we analysed three fishery indicators using generalized estimating equations to evaluate the fishers' response to the closure. We found that purse-seiners decreased their time spent in port, increased their fishing sets, and maintained their proportion of successful fishing sets. Our results highlight the relevance of accounting for the fisher behaviour to understand fisheries dynamics when establishing management regulations.
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ISSN 0044-7447 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2072
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Auteur Coz, R.; Ouisse, V.; Artero, C.; Carpentier, A.; Crave, A.; Feunteun, E.; Olivier, J.M.; Perrin, B.; Ysnel, F.
Titre Development of a new standardised method for sustainable monitoring of the vulnerable pink sea fan Eunicella verrucosa Type Article scientifique
Année 2012 Publication (up) Revue Abrégée Marine Biology
Volume 159 Numéro 6 Pages 1375-1388
Mots-Clés atlantic canada; cavolini coelenterata octocorallia; channel; gonadal development; gorgonian paramuricea-clavata; marine invertebrate; mediterranean-sea; modular growth; movement; northeast; singularis esper; water
Résumé The aim of this survey was to test a standardised method to follow the demographic evolution of a dense aggregative 'forest' population of the temperate gorgonian Eunicella verrucosa (Octocorallia, Gorgoniidae) using in situ photographic recordings. Distribution, density, growth and demographic evolution of the colonies was compared along two parallel transects. Computer treatment allowed the estimation of the total branch fan surface area, and the individual growth of tagged colonies was determined by measuring the increase in this surface area, using consecutive photographs taken at two-year intervals. To integrate the potential bias of branch overlapping, we proposed a correction factor between the in situ photographic surface area and the surface area of the gorgonian calculated from ex situ photographic surface area with all branches deployed. The surface-frequency distribution of colonies was converted to estimated-age-frequency distribution using an estimated growth curve based on the net growth rate. The technique used revealed significant differences in population structure and the dynamics of gorgonian colonies, as the two transects appeared to be influenced by different environmental conditions. The recruitment also seemed to vary according to year and transect, resulting in different densities. Our work showed clear results in characterising the variations of gorgonian demographic evolution at a small spatial scale; thus, it is assumed that this method could be a sustainable tool for coastal environmental managers.
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ISSN 0025-3162 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 539
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Auteur MILLER, M.J.; STEPPUTTIS, D.; BONHOMMEAU, S.; CASTONGUAY, M.; SCHABER, M.; VOBACH, M.; WYSUJACK, K.; HANEL, R.
Titre Comparisons of catches of large leptocephali using an IKMT and a large pelagic trawl in the Sargasso Sea Type Article scientifique
Année 2013 Publication (up) Revue Abrégée Marine Biodiversity
Volume 43 Numéro 4 Pages 493-501
Mots-Clés Anguilliformes; Elopomorpha; leptocephali; Net avoidance; Sampling methods; Sargasso Sea
Résumé Leptocephali of several elopomorph families can reach sizes of 100–300 mm or larger, but it is questionable if these large eel or notacanth larvae are effectively sampled by small-mesh sampling gear in the open ocean because of net avoidance or insufficient fishing effort. A sampling survey in the Sargasso Sea using both an Isaacs-Kidd Midwater Trawl (IKMT) with fine mesh and a large pelagic trawl with large mesh sizes found that fewer species and individual large leptocephali >100 mm were collected by 25 IKMT tows compared to 4 trawl deployments. Net avoidance of the IKMT by the larger leptocephali appeared to occur at least during the day, and the large trawl did not catch any small leptocephali because of the large mesh size. A combination of net avoidance of the IKMT and greater sampling effort of the much larger mouth-opening trawl seems to have resulted in more large leptocephali being collected by the trawl. This indicates that IKMT surveys undersample large leptocephali species and that large trawls do not sample the whole assemblage of leptocephali. To fully understand the biodiversity and abundance of leptocephali in the world’s oceans, large fine-mesh sampling gear like the IKMT and very large trawls with smaller mesh will likely be needed. This may be important because leptocephali are probably more abundant in the open ocean than is realized, and their role in the ocean surface layer communities and carbon cycle is not understood.
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ISSN 1867-1616 ISBN Médium
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Notes The following values have no corresponding Zotero field:<br/>Author Address: Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba 2778564, Japan.<br/>Author Address: Thunen Inst Balt Sea Fisheries, D-18069 Rostock, Germany.<br/>Author Address: IFREMER, UMR EME 212, Sete, France.<br/>Author Address: Inst Maurice Lamontagne, Mont Joli, PQ G5H 3Z4, Canada.<br/>Author Address: Thunen Inst Sea Fisheries, D-22767 Hamburg, Germany.<br/>Author Address: Thunen Inst Fisheries Ecol, D-22767 Hamburg, Germany.<br/>PB – Springer Heidelberg<br/> Approuvé pas de
Numéro d'Appel LL @ pixluser @ collection 286
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Auteur Milner-Gulland, E.J.; Garcia, S.; Arlidge, W.; Bull, J.; Charles, A.; Dagorn, L.; Fordham, S.; Zivin, J.G.; Hall, M.; Shrader, J.; Vestergaard, N.; Wilcox, C.; Squires, D.
Titre Translating the terrestrial mitigation hierarchy to marine megafauna by-catch Type Article scientifique
Année 2018 Publication (up) Revue Abrégée Fish. Fish.
Volume 19 Numéro 3 Pages 547-561
Mots-Clés albatrosses; artisanal fisheries; biodiversity offsets; biodiversity offsetting; circle hooks; conservation; economic incentives; fisheries bycatch; fishing effort; harbor porpoise; leatherback turtle; no net loss; seabird bycatch; sharks and rays; turtles
Résumé In terrestrial and coastal systems, the mitigation hierarchy is widely and increasingly used to guide actions to ensure that no net loss of biodiversity ensues from development. We develop a conceptual model which applies this approach to the mitigation of marine megafauna by-catch in fisheries, going from defining an overarching goal with an associated quantitative target, through avoidance, minimization, remediation to offsetting. We demonstrate the framework's utility as a tool for structuring thinking and exposing uncertainties. We draw comparisons between debates ongoing in terrestrial situations and in by-catch mitigation, to show how insights from each could inform the other; these are the hierarchical nature of mitigation, out-of-kind offsets, research as an offset, incentivizing implementation of mitigation measures, societal limits and uncertainty. We explore how economic incentives could be used throughout the hierarchy to improve the achievement of by-catch goals. We conclude by highlighting the importance of clear agreed goals, of thinking beyond single species and individual jurisdictions to account for complex interactions and policy leakage, of taking uncertainty explicitly into account and of thinking creatively about approaches to by-catch mitigation in order to improve outcomes for conservation and fishers. We suggest that the framework set out here could be helpful in supporting efforts to improve by-catch mitigation efforts and highlight the need for a full empirical application to substantiate this.
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Langue English Langue du Résumé Titre Original
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ISSN 1467-2960 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2337
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