@article{fdi:010077169, title = {{U}nexpected fish diversity gradients in the {A}mazon basin}, author = {{O}berdorff, {T}hierry and {D}ias, {M}. {S}. and {J}{\'e}z{\'e}quel, {C}{\'e}line and {A}lbert, {J}. {S}. and {A}rantes, {C}. {C}. and {B}igorne, {R}{\'e}my and {C}arvajal-{V}alleros, {F}. {M}. and {D}e {W}ever, {A}. and {F}rederico, {R}. {G}. and {H}idalgo, {M}. and {H}ugueny, {B}ernard and {L}eprieur, {F}. and {M}aldonado, {M}. and {M}aldonado-{O}campo, {J}. and {M}artens, {K}. and {O}rtega, {H}. and {S}armiento, {J}. and {T}edesco, {P}ablo and {T}orrente-{V}ilara, {G}. and {W}inemiller, {K}. {O}. and {Z}uanon, {J}.}, editor = {}, language = {{ENG}}, abstract = {{U}sing the most comprehensive fish occurrence database, we evaluated the importance of ecological and historical drivers in diversity patterns of subdrainage basins across the {A}mazon system. {L}inear models reveal the influence of climatic conditions, habitat size and sub-basin isolation on species diversity. {U}nexpectedly, the species richness model also highlighted a negative upriver-downriver gradient, contrary to predictions of increasing richness at more downriver locations along fluvial gradients. {T}his reverse gradient may be linked to the history of the {A}mazon drainage network, which, after isolation as western and eastern basins throughout the {M}iocene, only began flowing eastward 1-9 million years ({M}a) ago. {O}ur results suggest that the main center of fish diversity was located westward, with fish dispersal progressing eastward after the basins were united and the {A}mazon {R}iver assumed its modern course toward the {A}tlantic. {T}his dispersal process seems not yet achieved, suggesting a recent formation of the current {A}mazon system.}, keywords = {{COLOMBIE} ; {PEROU} ; {BRESIL} ; {AMAZONE} {BASSIN}}, booktitle = {}, journal = {{S}cience {A}dvances}, volume = {5}, numero = {9}, pages = {eaav8681 [9 p.]}, ISSN = {2375-2548}, year = {2019}, DOI = {10.1126/sciadv.aav8681}, URL = {https://www.documentation.ird.fr/hor/fdi:010077169}, }