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Microalgae in the division Haptophyta play key roles in the marine ecosystem and in global biogeochemical processes. Despite their ecological importance, knowledge on seasonal dynamics, community composition and abundance at the species level is limited due to their small cell size and few morphological features visible under the light microscope. Here, we present unique data on haptophyte seasonal diversity and dynamics from two annual cycles, with the taxonomic resolution and sampling depth obtained with high‐throughput sequencing. From outer Oslofjorden, S Norway, nano‐ and picoplanktonic samples were collected monthly for 2 years, and the haptophytes targeted by amplification of RNA/ cDNA  with Haptophyta‐specific 18S  rDNA  V4 primers. We obtained 156 operational taxonomic units (OTUs), from  c . 400.000 454 pyrosequencing reads, after rigorous bioinformatic filtering and clustering at 99.5%. Most OTUs represented uncultured and/or not yet 18S  rDNA ‐sequenced species. Haptophyte OTU richness and community composition exhibited high temporal variation and significant yearly periodicity. Richness was highest in September–October (autumn) and lowest in April–May (spring). Some taxa were detected all year, such as  Chrysochromulina simplex ,  Emiliania huxleyi  and  Phaeocystis cordata , whereas most calcifying coccolithophores only appeared from summer to early winter. We also revealed the seasonal dynamics of OTUs representing putative novel classes (clades HAP‐3–5) or orders (clades D, E, F). Season, light and temperature accounted for 29% of the variation in OTU composition. Residual variation may be related to biotic factors, such as competition and viral infection. This study provides new, in‐depth knowledge on seasonal diversity and dynamics of haptophytes in North Atlantic coastal waters.

Seasonal diversity and dynamics of haptophytes in the S kagerrak, N orway, explored by high‐throughput sequencing