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        An examination of the  influence of the Amazon River outflow on plankton productivity of the equatorial Atlantic Ocean. The Amazon is the largest river on Earth, and the plume can be observed thousands of miles from the river mouth. In the plume, diatoms, which contain symbiotic N2 fixing cyanobacteria, become abundant and effectively act as a food and a nutrient source for other organisms in the plume. The enhanced productivity of the plankton in the plume results in significant  sequestration of carbon to deep water of the Atlantic Ocean.