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Title: Unexpected fish diversity gradients in the Amazon basin
Authors: Oberdorff, Thierry
Dias, Murilo Sversut
J?z?quel, C?line
Albert, James Spurling
Arantes, Caroline Chaves
Bigorne, Rémy
Carvajal-Valleros, Fernando M.
Wever, Aaike de
Frederico, Renata Guimarães
Hidalgo, Max H.
Hugueny, Bernard
Leprieur, Fabien
Mabel, Maldonado,
Maldonado-Ocampo, Javier Alejandro
Martens, Koen M.
Ortega, Hernán
Jaime, Sarmiento,
Tedesco, Pablo A.
Torrente-Vilara, Gislene
Winemiller, Kirk O.
Zuanon, Jansen
Keywords: Catchments
Amazon Basin
Amazon River
Climatic Conditions
Drainage Networks
Eastern Basins
Species Richness
Species Diversity
Species Richness
Issue Date: 2019
metadata.dc.publisher.journal: Science Advances
metadata.dc.relation.ispartof: Volume 5, Número 9
Abstract: 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. Copyright © 2019 The Authors,
metadata.dc.identifier.doi: 10.1126/sciadv.aav8681
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