ZOOLOGIA_FCNO_UDEC_CL Foraminiferos_01 (OBIS South America, SOUTH PACIFIC NODE)
Seasonal and interannual changes in the flux of planktic foraminifera were studies in the Humboldt Current System off Coquimbo (30°S, 73°,15W), using material collected by time series sediment traps located at 2300 m water depth and 100 nautical miles from the coast. The almost continuous record span 8 years (1991-1998) with a temporal resolution of 6-13 days. Field work was carried out during the El Niño event of 1991/1992 (6 months), under normal conditions in 1993/1994 (1 years) and the strong 1997-1998 had only a limited impact on the planktic foraminifer flux. The seasonal fluxpattern of planktic foraminifera was marked by high fluxes during austral late winter–early summer (August–January) and low fluxes during the fall–early winter period (March–July). Five species contributed ca. 90% of the total flux of planktic foraminifers: Globigerina bulloides, Neogloboquadrina incompta, N. pachyderma, N. dutertrei, and Globigerinella calida. The most significant El Niño-related signal was a remarkable increase in the flux and abundance of species that, under normal conditions, only accounted for 10% of the planktic foraminiferal assemblage.
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