Phytoflagellate diversity in Roskilde Fjord (Denmark), including the description of Pyramimonas octopora sp. nov. (Pyramimonadales, Chlorophyta)

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dc.contributor.author Haraguchi, Lumi
dc.contributor.author Moestrup, Øjvind
dc.contributor.author Jakobsen, Hans Henrik
dc.contributor.author Lundholm, Nina
dc.date.accessioned 2022-05-12T12:17:39Z
dc.date.available 2022-05-12T12:17:39Z
dc.date.issued 2022
dc.identifier.citation Lumi Haraguchi, Øjvind Moestrup, Hans Henrik Jakobsen & Nina Lundholm (2022) Phytoflagellate diversity in Roskilde Fjord (Denmark), including the description of Pyramimonas octopora sp. nov. (Pyramimonadales, Chlorophyta), Phycologia, 61:1, 45-59. https://doi.org/10.1080/00318884.2021.2000285
dc.identifier.uri http://hdl.handle.net/10138/343640
dc.description.abstract Identification of planktonic flagellates is challenging, and multiple species are often lumped together, limiting our understanding of their diversity and ecology. Our aim was to investigate changes in the phytoplankton community composition over the annual cycle in Roskilde Fjord, Denmark, focusing on the identification of organisms smaller than 20 µm. Weekly microscope and pigment data indicated a low contribution of diatoms and dinoflagellates and the importance of cryptophytes, euglenophytes and green algae, with high contributions of alloxanthin and chlorophyll b. Community composition using Serial Dilution Cultures (SDC) confirmed the high contribution of cryptophytes, prasinophytes and euglenophytes in the phytoplankton community. In contrast, diatoms only played a minor role. Seasonal changes were observed within cryptophytes, with Teleaulax dominance during cold months shifting to Hemiselmis in summer. Small prasinophytes and pico-eukaryotes were always present but had a low relative contribution to the total phytoplankton biomass. Cultured organisms enabled the identification of Hemiselmis cf. cryptochromatica, recorded for the first time in European waters, and an undescribed Pyramimonas species. We describe the new species as Pyramimonas octopora sp. nov., placed within Pyramimonas subg. Vestigiferae, based on morphological and molecular (SSU rDNA) data. The distinctive features of the new species are the eight irregularly rounded perforations arranged in a square box with rounded corners around the centre of the base plate of the box scales, and the complex crown scales, not observed in previously described Pyramimonas species.
dc.language.iso en
dc.publisher International Phycological Society
dc.relation.ispartofseries Phycologia
dc.rights CC BY 4.0
dc.subject plankton
dc.subject mikrolevät
dc.subject ekologia
dc.subject Roskilde Fjord
dc.subject siimaeliöt
dc.subject Tanska
dc.subject annual cycle
dc.subject flagellates
dc.subject Pyramimonas subg. Vestigiferae
dc.subject serial dilution culture
dc.subject SSU rDNA
dc.title Phytoflagellate diversity in Roskilde Fjord (Denmark), including the description of Pyramimonas octopora sp. nov. (Pyramimonadales, Chlorophyta)
dc.format.volume 61
dc.format.issue 1
dc.identifier.urn URN:NBN:fi-fe2022051234948
dc.contributor.organization Suomen ympäristökeskus fi
dc.contributor.organization The Finnish Environment Institute en
dc.format.pagerange 45 - 59
dc.relation.doi https://doi.org/10.1080/00318884.2021.2000285
dc.relation.issn 0031-8884
dc.relation.issn 2330-2968
dc.type.okm A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.type.okm A1 Journal article (refereed), original research en

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