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Auteur Brehmer, P.; Laugier, T.; Kantoussan, J.; Galgani, F.; Mouillot, D.
Titre Does coastal lagoon habitat quality affect fish growth rate and their recruitment? Insights from fishing and acoustic surveys Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Estuar. Coast. Shelf Sci.
Volume 126 Numéro Pages 1-6
Mots-Clés Ecotoxicity; amphidromous; diversity; estuarine; exploitation; fish; habitat quality; indicators; lagoon; management; multibeam sonar; shallow water; size; target strength; thau lagoon; winter flounder
Résumé Ensuring the sustainability of fish resources necessitates understanding their interaction with coastal habitats, which is becoming ever more challenging in the context of ever increasing anthropogenic pressures. The ability of coastal lagoons, exposed to major sources of disturbance, to provide resources and suitable habitats for growth and survival of juvenile fish is especially important. We analysed three lagoons with different ecological statuses and habitat quality on the basis of their eutrophication and ecotoxicity (Trix test) levels. Fish abundances were sampled using fishing and horizontal beaming acoustic surveys with the same protocols in the same year. The relative abundance of Anguilla anguilla, Dicentrarchus labrax or the Mugilidae group was not an indicator of habitat quality, whereas Atherina boyeri and Sparus aurata appeared to be more sensitive to habitat quality. Fish abundance was higher in the two lagoons with high eutrophication and ecotoxicity levels than in the less impacted lagoon, while fish sizes were significantly higher in the two most severely impacted lagoons. This leads us to suggest low habitat quality may increase fish growth rate (by the mean of a cascading effect), but may reduce lagoon juvenile abundance by increasing larval mortality. Such a hypothesis needs to be further validated using greater investigations which take into account more influences on fish growth and recruitment in such variable environments under complex multi-stressor conditions. (C) 2013 Elsevier Ltd. All rights reserved.
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Volume de collection Numéro de collection Edition
ISSN 0272-7714 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 535
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Auteur Le Chevanton, M.; Garnier, M.; Bougaran, G.; Schreiber, N.; Lukomska, E.; Bérard, J.B.; Fouilland, E.; Bernard, O.; Cadoret, J.P.
Titre Screening and selection of growth-promoting bacteria for Dunaliella cultures Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Algal Research
Volume 2 Numéro Pages 212-222
Mots-Clés Bacterial diversity; Dunaliella; Interaction; bacteria; microalgae
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Volume de collection Numéro de collection Edition
ISSN 2211-9264 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 815
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Auteur Dobrovolski, R.; Loyola, R.D.; Guilhaumon, F.; Gouveia, S.F.; Diniz, J.A.F.
Titre Global agricultural expansion and carnivore conservation biogeography Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Biol. Conserv.
Volume 165 Numéro Pages 162-170
Mots-Clés Agriculture; Global biodiversity conservation priorities; Image; Mammal; Spatial prioritization; Zonation; biodiversity; biodiversity conservation; conservation; conserving; extinction risk; hotspots; human-population density; integrating economic costs; land-use; mammal conservation; prioritization schemes; protected areas
Résumé Global conservation prioritization must address conflicting land uses. We tested for spatial congruence between agricultural expansion in the 21st century and priority areas for carnivore conservation worldwide. We evaluated how including agricultural expansion data in conservation planning reduces such congruence and estimated the consequences of such an approach for the performance of resulting priority area networks. We investigated the correlation between projections of agricultural expansion and the solutions of global spatial prioritizations for carnivore conservation through the implementation of different goals: (1) purely maximizing species representation and (2) representing species while avoiding sites under high pressure for agriculture expansion. We also evaluated the performance of conservation solutions based on species' representation and their spatial congruence with established global prioritization schemes. Priority areas for carnivore conservation were spatially correlated with future agricultural distribution and were more similar to global conservation schemes with high vulnerability. Incorporating future agricultural expansion in the site selection process substantially reduced spatial correlation with agriculture, resulting in a spatial solution more similar to global conservation schemes with low vulnerability. Accounting for agricultural expansion resulted in a lower representation of species, as the average proportion of the range represented reduced from 58% to 32%. We propose that priorities for carnivore conservation could be integrated into a strategy that concentrates different conservation actions towards areas where they are likely to be more effective regarding agricultural expansion. (C) 2013 Elsevier Ltd. All rights reserved.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0006-3207 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 622
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Auteur Parravicini, V.; Kulbicki, M.; Bellwood, D.R.; Friedlander, A.M.; Arias-Gonzalez, J.E.; Chabanet, P.; Floeter, S.R.; Myers, R.; Vigliola, L.; D'Agata, S.; Mouillot, D.
Titre Global patterns and predictors of tropical reef fish species richness Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Ecography
Volume 36 Numéro 12 Pages 1254-1262
Mots-Clés Biogeography; constraints; coral-reefs; dispersal; diversity; eastern; gradients; marine biodiversity; ocean; pacific; spatial autocorrelation
Résumé In the marine realm, the tropics host an extraordinary diversity of taxa but the drivers underlying the global distribution of marine organisms are still under scrutiny and we still lack an accurate global predictive model. Using a spatial database for 6336 tropical reef fishes, we attempted to predict species richness according to geometric, biogeographical and environmental explanatory variables. In particular, we aimed to evaluate and disentangle the predictive performances of temperature, habitat area, connectivity, mid-domain effect and biogeographical region on reef fish species richness. We used boosted regression trees, a flexible machine-learning technique, to build our predictive model and structural equation modeling to test for potential mediation effects' among predictors. Our model proved to be accurate, explaining 80% of the total deviance in fish richness using a cross-validated procedure. Coral reef area and biogeographical region were the primary predictors of reef fish species richness, followed by coast length, connectivity, mid-domain effect and sea surface temperature, with interactions between the region and other predictors. Important indirect effects of water temperature on reef fish richness, mediated by coral reef area, were also identified. The relationship between environmental predictors and species richness varied markedly among biogeographical regions. Our analysis revealed that a few easily accessible variables can accurately predict reef fish species richness. They also highlight concerns regarding ongoing environmental declines, with region-specific responses to variation in environmental conditions predicting a variable response to anthropogenic impacts.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0906-7590 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 623
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Auteur Mouillot, D.; De Bortoli, J.; Leprieur, F.; Parravicini, V.; Kulbicki, M.; Bellwood, D.R.
Titre The challenge of delineating biogeographical regions: nestedness matters for Indo-Pacific coral reef fishes Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Journal of Biogeography
Volume 40 Numéro 12 Pages 2228-2237
Mots-Clés -diversity; Archipelago; Coral Triangle; Indo-Australian; Pae; beta-diversity; biodiversity hotspots; conservation; delineation; dissimilarity; dung beetles; endemicity; evolutionary history; global; historical biogeography; nestedness; parsimony analysis; partitioning; patterns; reef fish assemblages; spatial-patterns; turnover
Résumé AimThe delineation of regions is a critical procedure in biogeography, but there is still no consensus about the best approach. Traditionally, a compositional dissimilarity index and a clustering algorithm are used to partition locations into regions. However, the choice of index and algorithm may have a profound impact on the final result, particularly when locations display different levels of species richness and when they are nested within each other. Our objective was to estimate the influence of species nestedness among locations on the delineation of biogeographical regions. LocationAs a case study, we used coral reef fishes (families Chaetodontidae, Pomacentridae and Labridae) from the Indo-Pacific, where a large richness gradient extends, often as a series of nested assemblages, from the species-rich Indo-Australian Archipelago (Coral Triangle) to species-poor peripheral locations. MethodsWe used the turnover and nestedness components of the SOrensen and Jaccard dissimilarity indices to estimate the effect of nestedness on the delineation of biogeographical regions. In addition, we compared the results with those obtained using a parsimony analysis of endemicity (PAE). ResultsLow Mantel correlation values revealed that the PAE method assembled locations in a very different way than methods based on dissimilarity indices for Indo-Pacific coral reef fishes. We also found that nestedness mattered when delineating biogeographical units because, for both the SOrensen and the Jaccard indices, reef fish assemblages were grouped differently depending on whether we used the turnover component of each index or the complete index, including the nestedness component. The turnover component ignored variation in species richness attributable to differences in habitat area between locations, and permitted a delineation based solely on species replacement. Main conclusionsWe demonstrate that the choice of the component used to measure dissimilarity between species assemblages is critical, because it may strongly influence regional delineations, at least for Indo-Pacific coral reef fishes. We conclude that the two components of the dissimilarity indices can reveal complementary insights into the role that history may have played in shaping extant patterns of biodiversity.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0305-0270 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 879
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