PRJDB3038 Marine Metagenomics for Monitoring the Coastal Microbiota from the Ministry of Agriculture, Forestry and Fisheries of Japan In this study, we investigated the influence of diurnal sampling bias on the community structure of plankton by comparing the biodiversity among seawater samples (n = 9) obtained every 3 h for 24 h by using massively parallel sequencing (MPS)-based plankton monitoring at a fixed-point observation conducted at Himedo seaport in Yatsushiro Sea, Japan. Marine Metagenomics for Monitoring the Coastal Microbiota from the Ministry of Agriculture, Forestry and Fisheries of Japan bioproject PRJDB3038 PRJDB3038 true In this study, we investigated the influence of diurnal sampling bias on the community structure of plankton by comparing the biodiversity among seawater samples (n = 9) obtained every 3 h for 24 h by using massively parallel sequencing (MPS)-based plankton monitoring at a fixed-point observation conducted at Himedo seaport in Yatsushiro Sea, Japan.