Marine Snow
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<speciesfyi-glossary slug="marine-snow"></speciesfyi-glossary>Definition
A shower of organic particles falling from upper waters to the deep ocean, providing food for deep-sea organisms.
Detailed Explanation
Marine snow particles include dead phytoplankton, zooplankton fecal pellets, molted exoskeletons, and mucus aggregates. Their sinking rate determines how much carbon is sequestered in the deep ocean — a process called the biological pump, critical for regulating atmospheric CO₂. Bacteria colonize and decompose marine snow as it sinks, releasing nutrients that can fuel surface productivity when upwelled back to the photic zone.