Abstract
The association between heterotrophic bacterioplankton and phytoplankton was exam- ined in the northern region of the South China Sea where 3 marine biogeochemical provinces adjoin. The relationship between bacterial abundance and total chlorophyll a concentration was significant in the oceanic Archipelagic Deep Basin Province and in the China Sea Coastal Province, but not so in the Beibu Gulf (Sunda-Arafura Shelves Province). The importance of different phytoplankton groups (netplankton, nanoplankton and picoplankton, Synechococcus spp., Prochlorococcus spp. and pico- eukaryotes) to bacteria was examined by multiple linear regression analysis. We found that bottom- up control on bacteria depended strongly on the picoplankton size class of the phytoplankton, and particularly on the picocyanobacteria Synechococcus spp. Possible carbon transfer mechanisms suggest a plausible basis for the linkage of Synechococcus spp. to bacteria.
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