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We examined the influence of diurnal cycle, depth, exchange and proximity to land on the dynamics of microbial populations (bacteria, cyanobacteria, nanoplankton, phagotrophic nanoflagellates, ciliates and dinoflagellates) in Tikehau atoll lagoon (French Polynesia). Microbial populations increased over this 15 d study. Their abundances in the lagoon ranged from 1.2 to 2.6 x lo6 bacteria ml-', 1.1 to 4.0 x l o 5 cyanobacteria ml-', 200 to 1090 eukayotic phytoplankton ml-', 380 to 1500 phagotrophic nanoflagellates ml-', 0.3 to .4.0 ciliates ml-I, .and 11 to 195 nanodinoflagellates ml-'. hlicrobial abundances revealed that the intrusion 01 oceanic water into the lagoon only affected bacterial and cyanobacterial distributions in a narrow band around the lagoon. Grazing rate estimates and population dynamics showed that phagotrophic nanoflagellates were the major grazers of picoplankton (mainly bacteria and cyanobacteria). Cyanobacteria contributed about twice as much as bacteria to this grazed biomass and are therefore supposed to have a higher contribution to the transfer of organic carbon to the upper trophic levels. Heteroand autotrophic nanoflagellate abundance appeared to be regulated primarily by predators. Ciliates, and perhaps heterotrophic dinoflagellates, appeared to be grazing mostly on nanoplankton, both autotrophic and heterotrophic cells. Autotrophic and heterotrophic dinoflagellate populations increased at net rates comparable to, or even more rapidly than, other microbial communities; this suggests that dinoflagellates also play a significant role in the lagoon microbial foodweb. Additional aspects of the spatial and temporal variability of the microbial foodweb in Tikehau lagoon, as well as the role of grazers and dinoflagellates, are anallied. KES WORDS: Atoll lagoon. Microbial food web. Grazing. Bacterioplankton . Cyanobacteria. Protists. Dinoflagellates . Ciliates . Nanoflagellates ,.

Temporal and spatial dynamics of the pelagic microbial food web in an atoll lagoon