Journal
FEMS MICROBIOLOGY ECOLOGY
Volume 97, Issue 5, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/femsec/fiab055
Keywords
freshwater picocyanobacteria; time series data; hypereutrophic shallow lake; cytometric fingerprint; flowDiv; general additive models
Categories
Funding
- Argentinean Agency of Scientific and Technology Research -ANPCyT [PICT 2016-1554, 2016-1079, 2014-1290, 2014-1980, 2011-1029]
- Argentinean National Scientific and Technical Research Council - CONICET [PIP 01301, 00562]
- Argentinean Network for the Assessment and Monitoring of Pampean Shallow Lakes -PAMPA2 (CONICET)
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In this study, a 10-year time series from a hypereutrophic turbid shallow lake in South America provided the first long-term record of freshwater picocyanobacteria in the Southern Hemisphere. The analysis revealed seasonality in picocyanobacteria abundance, with winter peaks possibly linked to reduced presence of seasonal rotifers. Additionally, variations in predator-prey interactions, particularly with small cladocerans, influenced picocyanobacteria community structure and aggregation forms.
In aquatic systems, an interplay between bottom-up and top-down processes determines the dynamic of picocyanobacteria (Pcy) abundance and community structure. Here, we analyzed a 10-year time series (sampled fortnightly) from a hypereutrophic turbid shallow lake located within the Pampa Region of South America, generating the first long-term record of freshwater Pcy from the Southern Hemisphere. We used a cytometric approach to study Pcy community, and focused on its relations with nutrient and light conditions (bottom-up) and potential grazers (top-down). A novel Pcy abundance seasonality with winter maximums was observed for years with relatively stable hydrological levels, related with decreased abundance of seasonal rotifers during colder seasons. Pcy showed lower abundance and higher cytometric alpha diversity during summer, probably due to a strong predation exerted by rotifers. In turn, a direct effect of the non-seasonal small cladocerans Bosmina spp. decreased Pcy abundance and induced a shift from single-cell Pcy into aggregated forms. This structuring effect of Bosmina spp. was further confirmed by Pcy cytometric (dis)similarity analyses from the time series and in situ experimental data. Remarkably, Pcy showed acclimatization to underwater light variations, resembling the relevance of light in this turbid system.
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