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Growth rates of identifiable phytoplankton taxa, composite groups of phytoplankton (eg microflagellates) and size classes were calculated from changes in cell numbers or chlorophyll concentration occurring while size-fractionated natural phytoplankton assemblages were incubated in situ within diffusion chambers.\nGrowth experiments were carried out either in the lagoons of, or most commonly, in waters immediately adjacent to three reefs in the central GBR province, Myrmidon Reef, Rib Reef and Davies Reef. Myrmidon Reef was selected to typify conditions found on the outer shelf and in oceanic waters of the western Coral Sea. Located on a protrusion extending seaward from the continental shelfbreak, the sheltered northern side of Myrmidon Reef is exposed to oceanic waters in the southward flowing East Australian Current. Davies Reef and Rib Reef have mid- shelf locations and are surrounded by waters typifying the reef matrix and outer GBR lagoon. 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