Spatio-temporal diversity of free-living and particle-attached prokaryotes in the tropical lagoon of Ahe atoll (Tuamotu Archipelago) and its surrounding oceanic waters

► Bacterial density was higher in lagoon with a seasonal tendency. ► Cyanobacteria, to heterotrophic groups in Proteobacteria, and Flavobacteria. ► Euryarchaeota detected with seasonal effect and particle-prevalence for abundance. ► Difference in Lagoon and ocean archaeal community (within MG-II, MBG, Halobacteria). ► Prevalence of members usually associated with coral during rainy season.