We collected environmental samples during the second cruise of the project “The Great Southern Coccolithophore Belt” collecting samples in the South Indian Ocean and Southern Ocean; during the RSS James Clark Ross Cruise JCR271 as part of the project on Arctic Ocean Acidification collecting samples in the Arctic; finally we collected two costal samples off the coast of South Africa during algal bloom events. Samples included 16S, 18S amplicons and metagenomic data.