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Auteur Oberdorff, T.; Dias, M.S.; Jezequel, C.; Albert, J.S.; Arantes, C.C.; Bigorne, R.; Carvajal-Valleros, F.M.; De Wever, A.; Frederico, R.G.; Hidalgo, M.; Hugueny, B.; Leprieur, F.; Maldonado, M.; Maldonado-Ocampo, J.; Martens, K.; Ortega, H.; Sarmiento, J.; Tedesco, P.A.; Torrente-Vilara, G.; Winemiller, K.O.; Zuanon, J. doi  openurl
  Titre Unexpected fish diversity gradients in the Amazon basin Type Article scientifique
  Année 2019 Publication Revue Abrégée Sci. Adv.  
  Volume 5 Numéro 9 Pages eaav8681  
  Mots-Clés biodiversity; biogeography; climate-change; communities; convergence; diversification; fragmentation; patterns; river; speciation  
  Résumé Using the most comprehensive fish occurrence database, we evaluated the importance of ecological and historical drivers in diversity patterns of subdrainage basins across the Amazon system. Linear models reveal the influence of climatic conditions, habitat size and sub-basin isolation on species diversity. Unexpectedly, the species richness model also highlighted a negative upriver-downriver gradient, contrary to predictions of increasing richness at more downriver locations along fluvial gradients. This reverse gradient may be linked to the history of the Amazon drainage network, which, after isolation as western and eastern basins throughout the Miocene, only began flowing eastward 1-9 million years (Ma) ago. Our results suggest that the main center of fish diversity was located westward, with fish dispersal progressing eastward after the basins were united and the Amazon River assumed its modern course toward the Atlantic. This dispersal process seems not yet achieved, suggesting a recent formation of the current Amazon system.  
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  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  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 2375-2548 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000491128800037 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2681  
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Auteur Patino, J.; Guilhaumon, F.; Whittaker, R.J.; Triantis, K.A.; Gradstein, S.R.; Hedenas, L.; Gonzalez-Mancebo, J.M.; Vanderpoorten, A. url  doi
openurl 
  Titre Accounting for data heterogeneity in patterns of biodiversity: an application of linear mixed effect models to the oceanic island biogeography of spore-producing plants Type Article scientifique
  Année 2013 Publication Revue Abrégée Ecography  
  Volume 36 Numéro 8 Pages 904-913  
  Mots-Clés area; bryophytes; diversification; diversity; evolution; genetic-structure; moss; richness; scale; speciation  
  Résumé The general dynamic model of oceanic island biogeography describes the evolution of species diversity properties, including species richness (SR), through time. We investigate the hypothesis that SR in organisms with high dispersal capacities is better predicted by island area and elevation (as a surrogate of habitat diversity) than by time elapsed since island emergence and geographic isolation. Linear mixed effect models (LMMs) subjected to information theoretic model selection were employed to describe moss and liverwort SR patterns from 67 oceanic islands across 12 archipelagos. Random effects, which are used to modulate model parameters to take differences among archipelagos into account, included only a random intercept in the best-fit model for liverworts and in one of the two best-fit models for mosses. In this case, the other coefficients are constant across archipelagos, and we interpret the intercept as a measure of the intrinsic carrying capacity of islands within each archipelago, independently of their size, age, elevation and geographic isolation. The contribution of area and elevation to the models was substantially higher than that of time, with the least contribution made by measures of geographic isolation. This reinforces the idea that oceanic barriers are not a major impediment for migration in bryophytes and, together with the almost complete absence of in situ insular diversification, explains the comparatively limited importance of time in the models. We hence suggest that time per se has little independent role in explaining bryophyte SR and principally features as a variable accounting for the changing area and topographic complexity during the life-cycle of oceanic islands. Simple area models reflecting habitat availability and diversity might hence prevail over more complex temporal models reflecting in-situ speciation and dispersal (time, geographic connectivity) in explaining patterns of biodiversity for exceptionally mobile organisms.  
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  Editeur Lieu de Publication Éditeur  
  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  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 432  
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