DiatomsPhytoplanktonGenetic VariationPhylogenyBiodiversityDNA, AlgalSeawaterSequence Analysis, DNAEcosystemMolecular Sequence DataAlgal ProteinsSilicic AcidEukaryotaOceans and SeasAquatic OrganismsMicroalgaeSilicon DioxideSpecies SpecificityGeographyEvolution, MolecularCultural DiversitySiliconPlastidsXanthophyllsBacteriaPacific OceanGeologic Sediments