Planktonic foraminiferal assemblages and particle fluxes at the entrance of the Gulf of California highlight the effects of the strong El Niño 2015-2016 Nava-Fernandez, X. A. Machain-Castillo, M. L. /Sifeddine, Abdelfettah /Mendez-Millan, Mercedes /Caquineau, Sandrine Gibson, K. A. Tappa, E. Ruiz-Fernandez, A. C. Sanchez-Cabeza, J. A. Rodriguez-Ramirez, A. Lara-Cera, A. R. Particle fluxes Sediment trap Upwelling Eastern Tropical Pacific ENSO Seasonal cycles Primary productivity The impacts of El Nin similar to o 2015-2016 on planktonic foraminiferal assemblages and particle fluxes (total mass, organic carbon, total nitrogen, and carbonate) were analyzed in a sediment trap record located at the entrance of the Gulf of California from 2015 to 2019. Biweekly data of the sea surface temperature (SST) and sea surface chlorophyll-a (Chl-a) were obtained from satellite images (MODIS-AQUA) during this period. Particle fluxes and planktonic foraminiferal assemblages reflected the seasonal cycles of SST and phytoplankton biomass highlighting the effects of El Nin similar to o 2015-2016. During neutral and La Nin similar to a conditions, winter-spring upwelling leads to low SST, high Chl-a and particle fluxes, and an assemblage dominated by Globigerina bulloides while the summers are characterized by high SST, low Chl-a and particle fluxes, and a Globorotaloides hexagonus assemblage. In contrast, in normal summers, there is an alternation of G. bulloides and Orbulina universa-Trilobatus sacculifer-Globigerinella siphonifera associations. By late autumn under La Nin similar to a conditions, the Globigerinita glutinata assemblage reflects the transition from warm to cold conditions and the beginning of the upwelling season. This general pattern was affected by El Nin similar to o during 2015-2016. From late summer 2015 to early winter 2016 (El Nin similar to o 2015-2016 maximum intensity), Globigerinoides tenellus dominated, reflecting the intrusion of warm and oligotrophic equatorial waters. These results show the strong influence of El Nin similar to o Southern Oscillation (ENSO) on oceanic dynamics and planktonic foraminiferal assemblages at the entrance of the Gulf of California, and allow for a better interpretation of the preservation of these anomalous warm events in the sedimentary record, which can provide a better understanding of the long-term variations and effects of ENSO. 2022 text https://www.documentation.ird.fr/hor/fdi:010086389 fdi:010086389 Nava-Fernandez X. A., Machain-Castillo M. L., Sifeddine Abdelfettah, Mendez-Millan Mercedes, Caquineau Sandrine, Gibson K. A., Tappa E., Ruiz-Fernandez A. C., Sanchez-Cabeza J. A., Rodriguez-Ramirez A., Lara-Cera A. R.. Planktonic foraminiferal assemblages and particle fluxes at the entrance of the Gulf of California highlight the effects of the strong El Niño 2015-2016. 2022, 208, 102880 [12 p.] EN PACIFIQUE EST ZONE TROPICALE CALFORNIE GOLFE