Seasonal dynamics and nutrient controls of biogenic silica in Baltic Sea surface microplankton and picoplankton communities

Applied and Environmental Microbiology, Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

ABSTRACT In recent years, new contributors to the marine silica cycle have emerged, including pico-sized phytoplankton (<2–3 µm in size) such as Synechococcus and picoeukaryotes. Their contribution relevance cycling are still under investigation. Field studies reporting biogenic (bSi) standing stock fraction limited silica-poor oligotrophic environments, mechanism of bSi accumulation picoplankton remains unknown. We investigated variability stocks two size fractions (picoplankton, 0.22–3 microplankton, >3 µm) dissolved silica-replete Baltic Sea via biweekly time series samplings spanning 2 years. Time data showed that large changes Proper were primarily related microplankton biomass community composition. Meanwhile, were, at times, surprisingly high total year-round (up 21.6%). Simultaneously, we performed microcosm incubation experiments with natural communities each season examine how nutrient additions affected concentrations. these experiments, increases directly correlated diatom biomass, highlighting their influential role cycle. phosphorus triggered an increase all experiments. This uncovers a potential control picoplankton, which can help identify cellular mechanisms behind this process uncover cycling. The results link composition cycling, is important for understanding consequences organism shifts due climate change. IMPORTANCE carbon cycles tightly intertwined largely controlled by diatoms. Nevertheless, studies, mostly waters, proposed cycle: picoplankton. Here, report first study seasonal dynamics Sea. Microplankton biomass. Picoplankton consistent bSi, diverse communities, found direct correlation between accumulation. change-predicted will affect provide direction future research on controls

Язык: Английский

Effects of ambient silicic acid concentration on the physiology of marine cyanobacterial Synechococcus

Marine Environmental Research, Год журнала: 2025, Номер 209, С. 107220 - 107220

Опубликована: Май 10, 2025

Язык: Английский