Picocyanobacteria success in oligotrophic lakes: fact or fiction?

Abstract

Two approaches may be utilized to explain the predominance of picocyanobacteria (Pcy) in oligotrophic lakes: the analysis of their interannual evolution in one single lake and their relative importance in different lakes along a trophic gradient. Here we discuss results from field data on picocyanobacteria over several seasons from a deep oligotrophic subalpine lake - Lago Maggiore, and variables influencing their abundance. Comparing data from lakes along a trophic gradient, no simple relationship emerges between lake’s trophic state and picocyanobacteria abundance and contribution to total phytoplanktonic biomass. That is, trophic state alone cannot explain the success/absence of picocyanobacteria that appear to be favored under P limitation, but seem more sensitive to grazing pressure and light. In some oligotrophic lakes, if light climate, grazing, and competition are favorable, picocyanobacteria can grow rapidly, out-compete competitors and become very abundant, but there are a host of factors that can influence the outcome of this competition, and ultimately influence Pcy success in lakes of all trophic types.

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Published
2000-02-01
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Original Articles
Keywords:
picocyanobacteria, trophic gradient, lakes
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How to Cite
1.
CALLIERI C, STOCKNER J. Picocyanobacteria success in oligotrophic lakes: fact or fiction?. J Limnol [Internet]. 2000Feb.1 [cited 2020Oct.24];59(1):72-6. Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2000.72

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