Spatial-temporal study of cluster 5 picocyanobacteria and exopolymeric microgels in Lake Maggiore

Submitted: 29 November 2022
Accepted: 15 December 2022
Published: 27 December 2022
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In the oligotrophic Lake Maggiore, the majority of picocyanobacteria are phycoerythrin-bearing Synechococcus-type belonging to cluster 5 (Pcy-5). Their distribution was followed in a seven-year study along a depth gradient from the surface down to 350 m in relation to Transparent Exopolymer Particles (TEP), Total Organic Carbon (TOC), Chlorophyll-a (Chl-a) and water temperature. Pcy-5 abundances exhibit pronounced inter-annual variability, showing years of high numerical abundances as well as years with low numbers. In the upper 20 m, Pcy-5 peaks at around 10-15 m and then progressively decreases. Here, the Pcy-5 presence has been outlined for the first time in the deep layers of a deep lake, thus opening an interesting discussion on these organisms’ survival mechanisms in the absence of the light needed to perform photosynthesis. The relation of Pcy-5 with extracellular microgels was significant in autumn, when peaks of both variables were observed. In the other seasons, TEP was correlated with temperature and Chl-a, indicating the autochthonous origin of this fraction.



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How to Cite

Callieri, C., Sabatino, R., Di Cesare, A., & Bertoni, R. (2022). Spatial-temporal study of cluster 5 picocyanobacteria and exopolymeric microgels in Lake Maggiore. Advances in Oceanography and Limnology, 13(2).