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Schematic of potential polysaccharide cycling across the full-water depth of the Mariana Trench. Both phytoplankton and potential coastal/land-derived polysaccharides likely support hadal microorganisms and animals. After the extensive degradation of most liable storage polysaccharides in upper waters during long-distance descent, abundant cell wall polysaccharides are left in the hadal zone. These cell wall polysaccharides are initially consumed by specialized polysaccharide-degrading organisms like Bacteroidetes with possibly laterally acquired PULs. DOM, dissolved organic matter; POM, particulate organic matter

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