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Which of the following does not lead to an increase in phytoplankton reproduction?

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Phytoplankton / ˌfaɪtoʊˈplæŋktən / are the autotrophic (self-feeding) components of the plankton community and an integral part of ocean, ocean and freshwater river basin ecosystems. The name comes from the Greek words φυτόν (phyton), meaning “plant”, and πλαγκτός (planktos), meaning “wanderer” or “drifter”.[1] Most phytoplankton are too small to be seen alone with the unaided eye. However, when numbers are high enough, some varieties may be noticed as colored patches on the surface of the water due to the presence of chlorophyll in their cells and accessory pigments (such as phycobiliproteins or xanthophylls) in some species.