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The benthic recruitment of  Microcystis  was assessed  in vitro  in order (i) to compare the relative influence of the main abiotic factors, and (ii) to investigate the impact of the duration of the benthic life stage. Different benthic populations sampled in a 45 m deep artificial lake, with benthic life phases ranging from a few weeks to almost 3 years, were used to test the impact of three temperatures (4, 7 and 17°C), the absence or presence of light and sediment mixing on  Microcystis  recruitment. In this study, sediment mixing was the only physical factor found to promote recruitment, indicating that passive resuspension plays a much more important role in the recruitment of  Microcystis  than light and temperature. Moreover, recruitment occurred from all benthic populations, including one that was nearly 3 years old. No difference in the proportion of recruited cells was observed before and after the usual overwintering period, suggesting that the annual benthic overwintering does not impair the ability of  Microcystis  to inoculate the water column in the following spring. However, in the oldest population, the proportions of recruited cells were lower under all the experimental conditions tested, indicating a decrease in the ability of older benthic populations of  Microcystis  to contribute to the recruitment process.

Influence of light, sediment mixing, temperature and duration of the benthic life phase on the benthic recruitment of Microcystis