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Auteur (up) Bijoux, J.P.; Dagorn, L.; Berke, G.; Cowley, P.D.; Soria, M.; Gaertner, J.C.; Robinson, J.
Titre Temporal dynamics, residency and site fidelity of spawning aggregations of a herbivorous tropical reef fish Siganus sutor Type Article scientifique
Année 2013 Publication Revue Abrégée Marine Ecology Progress Series
Volume 475 Numéro Pages 233-247
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Résumé ABSTRACT: The shoemaker spinefoot Siganus sutor is a fast-growing, short-lived, gonochorist and herbivorous reef fish that forms transient fish spawning aggregations (FSAs). In the Seychelles, FSAs of this species occur monthly between September and June around the full moon. To study the spawning aggregation dynamics of S. sutor, 39 reproductively active individuals were acoustically tagged and monitored at 3 known FSA sites (Paté Polite, Paté Désiré and Paté Dividi) off the west coast of Praslin island (Seychelles) between October 2010 and April 2011. The presence and absence of tagged fish at the 3 sites were monitored using moored arrays of passive acoustic receivers, while the density of fish at the FSAs was quantified using underwater visual census (UVC). Most tagged fish (87.0%) detected in more than 1 spawning period showed fidelity to single spawning sites. Predominantly, tagged individuals arrived at FSA sites at dawn and departed at dusk. Spawning residency times at FSA sites ranged from 0.02 to 16.1 d. At Paté Polite, residency times were higher in the first half of the spawning season. Residency times were often several-fold shorter than aggregation duration which, when combined with patterns in arrival and departure times, indicates high turnover of fish within aggregations. The findings of this study provide information needed for emerging co-management schemes that aim to sustain this socio-economically important fishery.
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Numéro d'Appel LL @ pixluser @ collection 232
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Auteur (up) Brind’Amour, A.; Rochet, M.; Ordines, F.; Hosack, G.; Berthelé, O.; Mérigot, B.; Carbonara, P.; Follesa, M.; Jadaud, A.; Lefkaditou, E.; Maiorano, P.; Peristeraki, P.; Mannini, A.; Rabiller, M.; Spedicato, M.; Tserpes, G.; Trenkel, V.
Titre Environmental drivers explain regional variation of changes in fish and invertebrate functional groups across the Mediterranean Sea from 1994 to 2012 Type Article scientifique
Année 2016 Publication Revue Abrégée Marine Ecology Progress Series
Volume 562 Numéro Pages 19-35
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ISSN 0171-8630, 1616-1599 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1703
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Auteur (up) Callier, M.D.; Lefebvre, S.; Dunagan, M.K.; Bataille, M.P.; Coughlan, J.; Crowe, T.P.
Titre Shift in benthic assemblages and organisms diet at salmon farms: community structure and stable isotope analyses Type Article scientifique
Année 2013 Publication Revue Abrégée Marine Ecology Progress Series
Volume 483 Numéro Pages 153-167
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Résumé ABSTRACT: The extent of the influence of salmon farming on the environment and on the uptake of particulate and dissolved effluents by benthic organisms was assessed using community structure and stable isotope analyses. Sediment cores were collected in 2 directions: perpendicular and parallel to the main residual current, 0, 25 and 200 m from 2 salmon farms (Millstone and Cranford) located in Mulroy Bay, Ireland. In addition, artificial substrates were placed for 2 mo at 1 m depth 0, 25 and 200 m from one farm to trace the uptake of farm-related nutrients by fouling organisms. The extent of measurable change in benthic communities (abundance, diversity, structure, trophic composition) depended on residual current direction. Intraspecific variation in isotopic values in benthic invertebrates was mostly explained by distance from cages. Organisms collected at impacted sites exhibited a shift in isotopic composition towards that of farm wastes. A shift in δ13C was observed in several invertebrates, including the polychaetes Malacoceros fuliginosus and Nephtys hombergii, Nematoda and the anemone Anthopleura balii. Fouling communities collected on artificial structures, mainly composed of the tunicate Ascidiella aspersa, showed higher δ15N values at fish cage sites compared to sites 200 m away. The study demonstrated that fish effluents were assimilated and became food sources for several organisms.
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 857
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Auteur (up) Clavier, J.; Chauvaud, L.; Amice, E.; Lazure, P.; van der Geest, M.; Labrosse, P.; Diagne, A.; Carlier, A.; Chauvaud, S.
Titre Benthic metabolism in shallow coastal ecosystems of the Banc d’Arguin, Mauritania Type Article scientifique
Année 2014 Publication Revue Abrégée Marine Ecology Progress Series
Volume 501 Numéro Pages 11-23
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Numéro d'Appel MARBEC @ alain.herve @ 1236 collection 1368
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Auteur (up) Guinand, B.; Chauvel, C.; Lechene, M.; Tournois, J.; Tsigenopoulos, C.S.; Darnaude, A.M.; McKenzie, D.J.; Gagnaire, P.A.
Titre Candidate gene variation in gilthead sea bream reveals complex spatiotemporal selection patterns between marine and lagoon habitats Type Article scientifique
Année 2016 Publication Revue Abrégée Marine Ecology Progress Series
Volume 558 Numéro Pages 115-127
Mots-Clés Amplicon sequencing; Candidate gene; Genetic differentiation; Growth hormone; Local selection; Prolactin
Résumé In marine fishes, the extent to which spatial patterns induced by selection remain stable across generations remains largely unknown. In the gilthead sea bream Sparus aurata, polymorphisms in the growth hormone (GH) and prolactin (Prl) genes can display high levels of differentiation between marine and lagoon habitats. These genotype-environment associations have been attributed to differential selection following larval settlement, but it remains unclear whether selective mortality during later juvenile stages further shapes genetic differences among habitats. We addressed this question by analysing differentiation patterns at GH and Prl markers together with a set of 21 putatively neutral microsatellite loci. We compared genetic variation of spring juveniles that had just settled in 3 ecologically different lagoons against older juveniles sampled from the same sites in autumn, at the onset of winter outmigration. In spring, genetic differentiation among lagoons was greater than expected from neutrality for both candidate gene markers. Surprisingly, this signal disappeared completely in the older juveniles, with no significant differentiation for either locus a few months later in autumn. We searched for signals of haplotype structure within GH and Prl genes using next-generation amplicon deep sequencing. Both genes contained 2 groups of haplotypes, but high similarities among groups indicated that signatures of selection, if any, had largely been erased by recombination. Our results are consistent with the view that differential selection operates during early juvenile life in sea bream and highlight the importance of temporal replication in studies of post-settlement selection in marine fish.
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Editeur Lieu de Publication Éditeur
Langue Langue du Résumé Titre Original
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ISSN 0171-8630, 1616-1599 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2239
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