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| Oberdorff, Thierry; Dias, Murilo S.; Jézéquel, Céline; Albert, James S; Arantes, Caroline C.; Bigorne, Rémy; Carvajal-valleros, Fernando M.; De Wever, Aaike; Frederico, R. G.; Hidalgo, Max; Hugueny, Bernard; Leprieur, Fabien; Maldonado, Mabel; Maldonado-ocampo, Javier; Martens, Koen; Ortega, Hernan; Sarmiento, Jaime; Tedesco, Pablo A; Torrente-vilara, Gislene; Winemiller, Kirk O.; Zuanon, Jansen. |
| 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... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00589/70119/68101.pdf |
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| Leroy, Boris; Dias, Murilo S.; Giraud, Emilien; Hugueny, Bernard; Jézéquel, Céline; Leprieur, Fabien; Oberdorff, Thierry; Tedesco, Pablo A. |
| Aim To define the major biogeographical regions and transition zones for freshwater fish species. Taxon Strictly freshwater species of actinopterygian fish (i.e. excluding marine and amphidromous fish families). Methods We based our bioregionalization on a global database of freshwater fish species occurrences in drainage basins, which, after filtering, includes 11,295 species in 2,581 basins. On the basis of this dataset, we generated a bipartite (basin‐species) network upon which we applied a hierarchical clustering algorithm (the Map Equation) to detect regions. We tested the robustness of regions with a sensitivity analysis. We identified transition zones between major regions with the participation coefficient, indicating the degree to which a basin... |
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Palavras-chave: Actinopterygians; Biogeographical regions; Biogeography; Bioregionalization; Bioregions; Dispersal; Freshwater fish; Transition zones; Vicariance; Zoogeographical regions. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00514/62589/66985.pdf |
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