Functional group (ecology)
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- That the collection of organisms, called a plankton function type (PFT), should have an explicit biogeochemical role
- that the PFT should be defined by a distinct set of physiological, environmental, or nutrient requirements controlling its biomass and productivity,
- that the behavior of the PFT should have distinct effects on the performance of other PFTs, for instance, through selective depletion of nutrients or grazing, and
- that the PFT should be of quantitative importance in at least some region of the ocean.
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