Do human activities affect the picoplankton structure of the Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia)?

► Bacterioplankton abundance dominated the photoautotrophic organisms. ► Significant increases in bacterial abundance were observed with +P and +N. ► No evidence of impact by human sewage on picoplankton was apparent. ► A high heterotrophic metabolism influences the microbial network.