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Freshwater bacterioplankton, representing key ecosystem components, faces climate\u2010driven shifts; yet the fixed day\u2010length patterns determined by latitude underscore the importance of studying light's role in predicting ecosystem responses. We investigated bacterial community composition in a brown peat bog and a clear oligotrophic lake across seasons with contrasting light regimes: the summer solstice (&gt;\u200920\u2009h of daylight) and the autumn equinox (equal day\u2010night length). Using amplicon sequencing of 16S rRNA transcripts, alongside measurements of physicochemical parameters, organic matter characterisation and dissolved carbon dioxide and methane gas measurements, we found no diel cycling in the lake during either period or in the peat bog near the summer solstice. However, the structure of bacterial peat bog communities exhibited cyclic changes over diel cycles at the autumn equinox. Twelve amplicon sequence variants, including both phototrophic\u00a0and heterotrophic taxa, increased in abundance at all measured morning sampling times. These findings provide valuable insights into the diel patterns of boreal lentic habitats and their bacterioplankton communities, highlighting the absence of diel fluctuations in some systems and seasons, while revealing cyclic dynamics in others, driven by conditionally rare taxa.<\/jats:p>","DOI":"10.1111\/1758-2229.70099","type":"journal-article","created":{"date-parts":[[2025,5,9]],"date-time":"2025-05-09T00:29:29Z","timestamp":1746750569000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Diel Bacterioplankton Community Dynamics Under Contrasting Light Regimes"],"prefix":"10.1111","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7315-3671","authenticated-orcid":false,"given":"Sofia","family":"Papadopoulou","sequence":"first","affiliation":[{"name":"Department of Ecology and Genetics\/Limnology Uppsala University  Uppsala 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