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Auteur (up) Dupuy, C.; Pagano, M.; Got, P.; Domaizon, I.; Chappuis, A.; Marchessaux, G.; Bouvy, M. url  doi
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  Titre Trophic relationships between metazooplankton communities and their plankton food sources in the Iles Eparses (Western Indian Ocean) Type Article scientifique
  Année 2016 Publication Revue Abrégée Marine Environmental Research  
  Volume 116 Numéro Pages 18-31  
  Mots-Clés feeding ecology; grazing effect; Iles Eparses; Mayotte; Metazooplankton; spatial distribution  
  Résumé Coral reef and atoll lagoons are among the most diversified marine ecosystems but also the most affected by the combined effects of climate change and human activities. The Iles Eparses (Scattered Islands) in the Western Indian Ocean have been little affected by human pressure and can be considered to be “pristine” ecosystems. Metazooplankton plays a major role in the functioning and productivity of aquatic ecosystems, and this study was undertaken: (i) to determine the spatial abundance, distribution and species composition of metazooplankton, (ii) to assess the effect of metazooplankton grazing on pico- and nanophytoplankton and (iii) to analyze the trophic positions of metazooplankton by using the stable isotope signatures of a wide variety of taxa and particulate organic matter from the Iles Eparses and Mayotte. Tromelin Island (which is not located in the Mozambique Channel) had the lowest metazooplankton abundance with no cyanobacteria Trichodesmium spp. or mollusks (pteropods) presence, and with δ15N signatures of organisms that were higher than for the islands in the Mozambique Channel. Trichodesmium spp. was found in the Mozambique Channel and the plankton food web was probably based preferentially on these cyanobacteria with lower δ15N signatures indicating direct or indirect trophic transfer of diazotrophic nitrogen to metazooplankton. Three of the islands were distinct: Europa had the highest proportion of copepods, with oithonids being dominant, which is typical of rich mangrove systems, while Juan de Nova and Mayotte seemed to be the sites most affected by human activity with a high abundance of appendicularians and distinct particulate organic matter ∂13C signatures. Grazing experiments showed that food could be a limiting factor for metazooplankton in the Iles Eparses. However, the effect of metazooplankton grazing on phytoplankton appeared to be very low (0.01–2.32% of the total phytoplankton per day).  
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  ISSN 0141-1136 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1496  
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Auteur (up) Evans, S.M.; McKenna, C.; Simpson, S.D.; Tournois, J.; Genner, M.J. doi  openurl
  Titre Patterns of species range evolution in Indo-Pacific reef assemblages reveal the Coral Triangle as a net source of transoceanic diversity Type Article scientifique
  Année 2016 Publication Revue Abrégée Biol. Lett.  
  Volume 12 Numéro 6 Pages 20160090  
  Mots-Clés Bayesian skyline plot; biogeography; climate change; coral reef; fishes global patterns; marine biodiversity; ocean; phylogeography; refugia; species distributions  
  Résumé The Coral Triangle in the Indo-Pacific is a region renowned for exceptional marine biodiversity. The area could have acted as a 'centre of origin' where speciation has been prolific or a 'centre of survival' by providing refuge during major environmental shifts such as sea-level changes. The region could also have acted as a 'centre of accumulation' for species with origins outside of the Coral Triangle, owing to it being at a central position between the Indian and Pacific oceans. Here, we investigated support for these hypotheses using population-level DNA sequence-based reconstructions of the range evolution of 45 species (314 populations) of Indo-Pacific reef-associated organisms. Our results show that populations undergoing the most ancient establishment were significantly more likely to be closer to the centre of the Coral Triangle than to peripheral locations. The data are consistent with the Coral Triangle being a net source of coral-reef biodiversity for the Indo-Pacific region, suggesting that the region has acted primarily as a centre of survival, a centre of origin or both. These results provide evidence of how a key location can influence the large-scale distributions of biodiversity over evolutionary timescales.  
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  ISSN 1744-9561 ISBN Médium  
  Région Expédition Conférence  
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  Numéro d'Appel MARBEC @ alain.herve @ collection 1694  
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Auteur (up) Fernandez-Arcaya, U.; Bitetto, I.; Esteban, A.; Teresa Farriols, M.; Garcia-Ruiz, C.; Gil de Sola, L.; Guijarro, B.; Jadaud, A.; Kavadas, S.; Lembo, G.; Milisenda, G.; Maina, I.; Petovic, S.; Sion, L.; Vaz, S.; Massuti, E. doi  openurl
  Titre Large-scale distribution of a deep-sea megafauna community along Mediterranean trawlable grounds Type Article scientifique
  Année 2019 Publication Revue Abrégée Sci. Mar.  
  Volume 83 Numéro Pages 175-187  
  Mots-Clés aristeus-antennatus risso; biodiversity; biomass; community; continental slope; decapod crustaceans; deep sea; demersal fish diversity; distribution pattern; fishing impact; impacts; megafauna; red shrimp; relative roles; size; spatial-distribution; western  
  Résumé The large-scale distribution pattern of megafauna communities along the Mediterranean middle slope was explored. The study was conducted between 500 and 800 m depth where deep-water fishery occurs. Although community studies carried out deeper than 500 m are partly available for some geographic areas, few large-scale comparative studies have been carried out. Within the framework of the MEDITS survey programme, we compared the megafauna community structure in ten geographical sub-areas (GSAs) along the Mediterranean coasts. Additionally, the spatial distribution of fishing was analysed using vessel monitoring by satellite information. Overall, the community showed a significant difference between sub-areas, with a decreasing eastward pattern in abundance and biomass. Longitude was the main factor explaining variation among sub-areas (by generalized additive models). However, we found a region which did not follow the general pattern. GSA 6 (northern Spain) showed significantly lower abundance and a different composition structure to the adjacent areas. The decrease in community descriptors (i.e. abundance and biomass) in this area is probably a symptom of population changes induced by intense fishery exploitation. Overall, a combination of environmental variables and human-induced impacts appears to influence the bentho-pelagic communities along the slope areas of the Mediterranean.  
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  Langue English Langue du Résumé Titre Original  
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  Volume de collection Numéro de collection Edition  
  ISSN 0214-8358 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000504829900014 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2699  
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Auteur (up) Follesa, M.C.; Marongiu, M.F.; Zupa, W.; Bellodi, A.; Cau, A.; Cannas, R.; Colloca, F.; Djurovic, M.; Isajlovic, I.; Jadaud, A.; Manfredi, C.; Mulas, A.; Peristeraki, P.; Porcu, C.; Ramirez-Amaro, S.; Salmeron Jimenez, F.; Serena, F.; Sion, L.; Thasitis, I.; Cau, A.; Carbonara, P. doi  openurl
  Titre Spatial variability of Chondrichthyes in the northern Mediterranean Type Article scientifique
  Année 2019 Publication Revue Abrégée Sci. Mar.  
  Volume 83 Numéro Pages 81-100  
  Mots-Clés abundance; adriatic sea; balearic-islands; bottom trawl surveys; by-catch; Chondrichthyes; demersal assemblages; depth distribution; distribution; dynamics; elasmobranchs; fish; fisheries; Mediterranean; parameters; patterns  
  Résumé Thanks to the availability of the MEDITS survey data, a standardized picture of the occurrence and abundance of demersal Chondrichthyes in the northern Mediterranean has been obtained. During the spring-summer period between 2012 and 2015, 41 Chondrichthyes, including 18 sharks (5 orders and 11 families). 22 batoids (3 orders and 4 families) and 1 chimaera, were detected from several geographical sub-areas (GSAs) established by the General Fisheries Commission for the Mediterranean. Batoids had a preferential distribution on the continental shelf (10-200 m depth). while shark species were more frequent on the slope (200-800 m depth). Only three species, the Carcharhiniformes Galeus melastomus and Scyliorhinus canicida and the Torpediniformes Torpedo matmorata were caught in all GSAs studied. On the continental shelf, the Rajidae family was the most abundant, being represented in primis by Raja clavaia and then by R. miraleius, R. polystigma and R. asterias. The slope was characterized by the prevalence of G. melastomus in all GSAs, followed by S. canictda, E. spinax and Squalus blainville. Areas under higher fishing pressure, such as the Adriatic Sea and the Spanish coast (with the exception of the Balearic Islands), show a low abundance of chondrichthyans, but other areas with a high level of fishing pressure, such as southwestern Sicily, show a high abundance, suggesting that other environmental drivers work together with fishing pressure to shape their distribution. Results of generalized additive models highlighted that depth is one of the most important environmental drivers influencing the distribution of both batoid and shark species, although temperature also showed a significant influence on their distribution. The approach explored in this work shows the possibility of producing maps modelling the distribution of demersal chondrichthyans in the Mediterranean that are useful for the management and conservation of these species at a regional scale. However, because of the vulnerability of these species to fishing exploitation, fishing pressure should be further incorporated in these models in addition to these environmental drivers.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0214-8358 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000504829900007 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2700  
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Auteur (up) FROMENTIN, J.-M.; LOPUSZANSKI, D. url  openurl
  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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