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Fine‐scale spatial and temporal genetic differentiation of water bloom‐forming cyanobacterium Microcystis aeruginosa : revealed by multilocus sequence typing
Author(s) -
Tanabe Yuuhiko,
Kasai Fumie,
Watanabe Makoto M.
Publication year - 2009
Publication title -
environmental microbiology reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.229
H-Index - 69
ISSN - 1758-2229
DOI - 10.1111/j.1758-2229.2009.00088.x
Subject(s) - multilocus sequence typing , biology , microcystis aeruginosa , isolation by distance , population , genetic diversity , evolutionary biology , genetics , typing , genetic structure , selection (genetic algorithm) , genetic variation , genotype , cyanobacteria , gene , demography , sociology , bacteria , artificial intelligence , computer science
Summary Accumulating evidence suggests that physical isolation can potentially make a significant contribution to microbial population structure and incipient speciation. However, the effect of geographic factors on population structure has not been explicitly studied for ubiquitous cyanobacteria such as a water bloom‐forming Microcystis aeruginosa . To investigate whether a fine‐scale geographic structure is developed within M. aeruginosa , 96 isolates from five Japanese lakes separated by < 55 km were analysed using multilocus sequence typing. The results of multilocus sequence typing analyses indicated that M. aeruginosa was not phylogeographically structured, although a high level of genetic differentiation was observed among locations ( F ST = 0.372). Most surprisingly, the highest levels of genetic differentiation were observed between populations at the same location at different times of the same year, and between those separated by only 3 km on the same day. The isolation‐by‐distance pattern was not supported, but not completely ruled out. Taken together, our results suggest that geographic factors, if present, have far less impact on the fine‐scale spatial genetic diversity of M. aeruginosa than local genetic drift or, possibly, selection.