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Auteur (up) Leprieur, F.; Colosio, S.; Descombes, P.; Parravicini, V.; Kulbicki, M.; Cowman, P.F.; Bellwood, D.R.; Mouillot, D.; Pellissier, L.
Titre Historical and contemporary determinants of global phylogenetic structure in tropical reef fish faunas Type Article scientifique
Année 2016 Publication Revue Abrégée Ecography
Volume 39 Numéro 9 Pages 825-835
Mots-Clés biodiversity hotspots; climate-change; community ecology; coral-reefs; damselfishes teleostei; evolutionary origins; genetic-structure; indo-pacific; latitudinal diversity gradient; species richness
Résumé Identifying the main determinants of tropical marine biodiversity is essential for devising appropriate conservation measures mitigating the ongoing degradation of coral reef habitats. Based on a gridded distribution database and phylogenetic information, we compared the phylogenetic structure of assemblages for three tropical reef fish families (Labridae: wrasses, Pomacentridae: damselfishes and Chaetodontidae: butterflyfishes) using the net relatedness (NRI) and nearest taxon (NTI) indices. We then related these indices to contemporary and historical environmental conditions of coral reefs using spatial regression analyses. Higher levels of phylogenetic clustering were found for fish assemblages in the Indo-Australian Archipelago (IAA), and more particularly when considering the NTI index. The phylogenetic structure of the Pomacentridae, and to a lower extent of the Chaeotodontidae and Labridae, was primarily associated with the location of refugia during the Quaternary period. Phylogenetic clustering in the IAA may partly result from vicariance events associated with coral reef fragmentation during the glacial periods of the Quaternary. Variation in the patterns among fish families further suggest that dispersal abilities may have interacted with past habitat availability in shaping the phylogenetic structure of tropical reef fish assemblages.
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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 0906-7590 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1633
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Auteur (up) Leprieur, F.; Oikonomou, A.
Titre The need for richness-independent measures of turnover when delineating biogeographical regions Type Article scientifique
Année 2014 Publication Revue Abrégée Journal of Biogeography
Volume 41 Numéro 2 Pages 417-420
Mots-Clés Beta diversity; bioregionalization; clustering; compositional dissimilarity; freshwater fishes; species richness; species turnover; β-3 index; βsim index
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Volume de collection Numéro de collection Edition
ISSN 1365-2699 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 896
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Auteur (up) Lucena-Fredou, F.; Kell, L.; Fredou, T.; Gaertner, D.; Potier, M.; Bach, P.; Travassos, P.; Hazin, F.; Menard, F.
Titre Vulnerability of teleosts caught by the pelagic tuna longline fleets in South Atlantic and Western Indian Oceans Type Article scientifique
Année 2017 Publication Revue Abrégée Deep-Sea Res. Part II-Top. Stud. Oceanogr.
Volume 140 Numéro Pages 230-241
Mots-Clés Bycatch; climate-change; ecological risk-assessment; exploitation status; Fishery management; impact; life-history strategies; management; marine fishes; Productivity and Susceptibility Analysis; risk; Sustainability; trawl fishery
Résumé Productivity and Susceptibility Analysis (PSA) is a methodology for evaluating the vulnerability of a stock based on its biological productivity and susceptibility to fishing. In this study, we evaluated the vulnerability of 60 stocks of tuna, billfishes and other teleosts caught by the tuna longline fleets operating in the South Atlantic and Indian Ocean using a semi-quantitative PSA. We (a) evaluated the vulnerability of the species in the study areas; (b) compared the vulnerability of target and non-target species and oceans; (c) analyzed the sensitivity of data entry; and (d) compared the results of the PSA to other fully quantitative assessment methods. Istiophoridae exhibited the highest scores for vulnerability. The top 10 species at risk were: Atlantic Istiophorus albicans; Indian Ocean Istiompax indica; Atlantic Makaira nigricans and Thunnus alalunga; Indian Ocean Xiphias gladius; Atlantic T. albacares, Gempylus serpens, Ranzania laevis and X. gladius; and Indian Ocean T. alalunga. All species considered at high risk were targeted or were commercialized bycatch, except for the Atlantic G. serpens and R. laevis which.were discarded, and may be considered as a false positive. Those species and others at high risk should be prioritized for further assessment and/or data collection. Most species at moderate risk were bycatch species kept for sale. Conversely, species classified at low risk were mostly discarded. Overall, species at high risk were overfished and/or subjected to overfishing. Moreover, all species considered to be within extinction risk (Critically Endangered, Endangered and Vulnerable) were in the high risk category. The good concordance between approaches corroborates the results of our analysis. PSA is not a replacement for traditional stock assessments, where a stock is assessed at regular intervals to provide management advice. It is of importance, however, where there is uncertainty about catches and life history parameters, since it can identify species at risk, and where management action and data collection is required, e.g. for many species at high and most at moderate risk in the South Atlantic and Indian oceans.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0967-0645 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2179
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Auteur (up) Massol, F.; Dubart, M.; Calcagno, V.; Cazelles, K.; Jacquet, C.; Kefi, S.; Gravel, D.
Titre Island Biogeography of Food Webs Type Chapitre de livre
Année 2017 Publication Revue Abrégée
Volume Numéro Pages 183-262
Mots-Clés animal abundance; body-size; complex networks; coral-reef fishes; coupled chemical-reactions; ecological communities; experimental zoogeography; habitat loss; power-laws; species-area relationship
Résumé To understand why and how species invade ecosystems, ecologists have made heavy use of observations of species colonization on islands. The theory of island biogeography, developed in the 1960s by R.H. MacArthur and E.O. Wilson, has had a tremendous impact on how ecologists understand the link between species diversity and characteristics of the habitat such as isolation and size. Recent developments have described how the inclusion of information on trophic interactions can further inform our understanding of island biogeography dynamics. Here, we extend the trophic theory of island biogeography to assess whether certain food web properties on the mainland affect colonization/extinction dynamics of species on islands. Our results highlight that both food web connectance and size on the mainland increase species diversity on islands. We also highlight that more heavily tailed degree distributions in the mainland food web correlate with less frequent but potentially more important extinction cascades on islands. The average shortest path to a basal species on islands follows a hump-shaped curve as a function of realized species richness, with food chains slightly longer than on the mainland at intermediate species richness. More modular mainland webs are also less persistent on islands. We discuss our results in the context of global changes and from the viewpoint of community assembly rules, aiming at pinpointing further theoretical developments needed to make the trophic theory of island biogeography even more useful for fundamental and applied ecology.
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Editeur Elsevier Academic Press Inc Lieu de Publication San Diego Éditeur Bohan, D.A.; Dumbrell, A.J.; Massol, F.
Langue English Langue du Résumé Titre Original
Éditeur de collection Titre de collection Titre de collection Abrégé Networks of Invasion: A Synthesis of Concepts
Volume de collection 56 Numéro de collection Edition
ISSN ISBN 978-0-12-804331-8 978-0-12-804338-7 Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2174
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Auteur (up) Mérigot, B.; Frédou, F.L.; Viana, A.P.; Ferreira, B.P.; do Nascimento Costa Junior, E.; Beserra da Silva Júnior, C.A.; Frédou, T.
Titre Fish assemblages in tropical estuaries of northeast Brazil: A multi-component diversity approach Type Article scientifique
Année 2017 Publication Revue Abrégée Ocean & Coastal Management
Volume 143 Numéro Pages 175-183
Mots-Clés Diversity indices; Double principal coordinate analysis; ecosystem-based fisheries management; Estuaries; Fishes; monitoring; taxonomic diversity
Résumé Biodiversity in estuarine ecosystems suffers from the impact of environmental changes and human activities. This mainly involves changes in temperature, salinity, pollution, habitat degradation or loss and fishing activities. The diversity of species communities is traditionally assessed on the basis of their species richness and composition. However, there is growing interest in taking into account complementary components dealing with species differences (e.g. taxonomic relatedness). In spite of their social, ecological and economic importance, the diversity of tropical estuarine fish assemblages has rarely been monitored by means of a multi-component approach under different human pressure and environmental conditions. We analysed the diversity of exploited fish communities (both target and non-target species) sampled during scientific surveys within four estuarine complexes in the state of Pernambuco, Brazil: Itapissuma, Suape, Sirinhaém, and Rio Formoso. A total of 122 species were collected within 34 samples. Overall, diversity indices and species models fitting dominance-evenness profiles mainly revealed differences between assemblages from Itapissuma, being the largest estuary with wide areas of mangrove, and the other estuaries. While assemblages from Itapissuma generally encompassed more species and individuals than the other estuaries, species were more closely related from a taxonomic point of view. In addition, a Double Principal Coordinate Analysis (DPCoA) established a typology of assemblages, useful for management purposes, and linked to particular fish families: it highlighted differences between Itapissuma, Suape, Sirinhaém and Rio Formoso. This method combines matrices of species abundances and differences (here taxonomic distances according to the Linnean classification). It was particularly accurate with a first factorial plane explaining 73% of the total inertia, while only 17% was achieved by a traditional Principal Component Analysis (PCA). Overall, this study provides an assessment of the state of fish assemblage diversity in Pernambuco estuaries where contrasted human and environmental conditions occur. It underscores the accuracy of using a multi-component diversity approach, with a multivariate analysis that is not yet widely used, for monitoring the diversity of estuaries for ecosystem-based fisheries management purposes.
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Éditeur de collection Titre de collection The challenge of developing policies and management strategies under changing baselines and unbounded boundaries Titre de collection Abrégé
Volume de collection 143 Numéro de collection Edition
ISSN 0964-5691 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2137
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