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Seasonal dynamics in picocyanobacterial abundance and clade composition at coastal and offshore stations in the Baltic Sea
Linnaeus University, Kalmar, Sweden.
Halmstad University, School of Business, Innovation and Sustainability. Linnaeus University, Kalmar, Sweden.ORCID iD: 0000-0001-7155-3604
Linnaeus University, Kalmar, Sweden.
2022 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, article id 14330Article in journal (Refereed) Published
Abstract [en]

Picocyanobacteria (< 2 µm in diameter) are significant contributors to total phytoplankton biomass. Due to the high diversity within this group, their seasonal dynamics and relationship with environmental parameters, especially in brackish waters, are largely unknown. In this study, the abundance and community composition of phycoerythrin rich picocyanobacteria (PE-SYN) and phycocyanin rich picocyanobacteria (PC-SYN) were monitored at a coastal (K-station) and at an offshore station (LMO; ~ 10 km from land) in the Baltic Sea over three years (2018-2020). Cell abundances of picocyanobacteria correlated positively to temperature and negatively to nitrate (NO3) concentration. While PE-SYN abundance correlated to the presence of nitrogen fixers, PC-SYN abundance was linked to stratification/shallow waters. The picocyanobacterial targeted amplicon sequencing revealed an unprecedented diversity of 2169 picocyanobacterial amplicons sequence variants (ASVs). A unique assemblage of distinct picocyanobacterial clades across seasons was identified. Clade A/B dominated the picocyanobacterial community, except during summer when low NO3, high phosphate (PO4) concentrations and warm temperatures promoted S5.2 dominance. This study, providing multiyear data, links picocyanobacterial populations to environmental parameters. The difference in the response of the two functional groups and clades underscore the need for further high-resolution studies to understand their role in the ecosystem. © 2022. The Author(s).

Place, publisher, year, edition, pages
London: Nature Publishing Group, 2022. Vol. 12, article id 14330
National Category
Ecology
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URN: urn:nbn:se:hh:diva-48930DOI: 10.1038/s41598-022-18454-8ISI: 000844144900086PubMedID: 35995823Scopus ID: 2-s2.0-85136194158OAI: oai:DiVA.org:hh-48930DiVA, id: diva2:1719402
Note

Funding: Open access funding provided by Linnaeus University.

Available from: 2022-12-15 Created: 2022-12-15 Last updated: 2022-12-15Bibliographically approved

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Legrand, Catherine

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