Mechanisms and Pathways of Small-Phytoplankton Export from the Surface Ocean - PubMed

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Mechanisms and Pathways of Small-Phytoplankton Export from the Surface Ocean

Tammi L Richardson. Ann Rev Mar Sci. 2019.

Abstract

Carbon fixation by phytoplankton near the surface and the sinking of this particulate material to deeper waters are key components of the biological carbon pump. The efficiency of the biological pump is influenced by the size and taxonomic composition of the phytoplankton community. Large, heavily ballasted taxa such as diatoms sink quickly and thus efficiently remove fixed carbon from the upper ocean. Smaller, nonballasted species such as picoplanktonic cyanobacteria are usually thought to contribute little to export production. Research in the past decade, however, has shed new light on the potential importance of small phytoplankton to carbon export, especially in oligotrophic oceans, where small cells dominate primary productivity. Here, I examine the mechanisms and pathways through which small-phytoplankton carbon is exported from the surface ocean and the role of small phytoplankton in food webs of a variety of ocean ecosystems.

Keywords: aggregation; carbon; fecal pellet; food web; grazing; particle; sinking; vertical flux.

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