@article{fdi:010081035, title = {{E}volution of the riverine nutrient export to the {T}ropical {A}tlantic over the last 15 years : is there a link with {S}argassum proliferation ?}, author = {{J}ouanno, {J}ulien and {M}oquet, {J}. {S}. and {B}erline, {L}. and {R}adenac, {M}arie-{H}{\'e}l{\`e}ne and {S}antini, {W}illiam and {C}hangeux, {T}homas and {T}hibaut, {T}. and {P}odlejski, {W}. and {M}{\'e}nard, {F}r{\'e}d{\'e}ric and {M}artinez, {J}ean-{M}ichel and {A}umont, {O}livier and {S}heinbaum, {J}. and {F}ilizola, {N}. and {N}'{K}aya, {G}. {D}. {M}.}, editor = {}, language = {{ENG}}, abstract = {{T}he {T}ropical {A}tlantic is facing a massive proliferation of {S}argassum since 2011, with severe environmental and socioeconomic impacts. {A}s a contribution to this proliferation, an increase in nutrient inputs from the tropical rivers, in response to climate and land use changes or increasing urbanization, has been often suggested and widely reported in the scientific and public literature. {H}ere we discuss whether changes in river nutrient inputs could contribute to {S}argassum proliferation in the recent years or drive its seasonal cycle. {U}sing long-term in situ and satellite measurements of discharge, dissolved and particulate nutrients of the three world largest rivers ({A}mazon, {O}rinoco, {C}ongo), we do not find clear evidences that nutrient fluxes may have massively increased over the last 15 years. {M}oreover, focusing on year 2017, we estimate that along the year only 10% of the {S}argassum biomass occurred in regions under river plume influence. {W}hile deforestation and pollution are a reality of great concern, our results corroborate recent findings that hydrological changes are not the first order drivers of {S}argassum proliferation. {B}esides, satellite observations suggest that the major {A}tlantic river plumes suffered a decrease of phytoplankton biomass in the last two decades. {R}econciling these observations requires a better understanding of the nutrient sources that sustain {S}argassum and phytoplankton growth in the region.}, keywords = {{S}argassum ; hydrology ; {A}mazon ; {ATLANTIQUE} ; {ZONE} {TROPICALE} ; {AMAZONE} {COURS} {D}'{EAU}}, booktitle = {}, journal = {{E}nvironmental {R}esearch {L}etters}, volume = {16}, numero = {3}, pages = {034042 [8 ]}, ISSN = {1748-9326}, year = {2021}, DOI = {10.1088/1748-9326/abe11a}, URL = {https://www.documentation.ird.fr/hor/fdi:010081035}, }