High-frequency monitoring of the genetic diversity and the potential toxicity of a Microcystis aeruginosa bloom in a French shallow lake.

Abstract:

:During cyanobacterial blooms, processes influencing the population dynamics of blooming species remain partially unexplained. To provide new information, we performed a high-frequency monitoring – every 2 days at six sampling points – of a Microcystis aeruginosa population blooming in a shallow lake. At each sampling date, there was no spatial heterogeneity in the ITS genotypic composition of the population and in the proportion of potentially microcystin- producing (mcyB+) cells, whereas high variations were recorded in cell abundances. In contrast, when looking at the temporal evolution of these parameters, the ITS genotypic composition of the population and in a lesser extent the percentage of mcyB+ cells displayed high variations during the growth phase of the bloom, but not during the plateau phase or the subsequent decline. This suggests that during the development of the bloom, there was no directional selection leading to the dominance of a restricted number of genotypes and that a balancing selection process permitted the maintenance of a high genetic diversity in the Microcystis population. Finally, no relationship was found between these variations occurring in the Microcystis population and those recorded for several environmental parameters, suggesting that many factors and processes interacting together might be involved in these variations.

journal_name

FEMS Microbiol Ecol

authors

Pobel D,Godon JJ,Humbert JF,Robin J

doi

10.1111/j.1574-6941.2011.01203.x

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

132-41

issue

1

eissn

0168-6496

issn

1574-6941

journal_volume

79

pub_type

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