Abstract:

An in-situ simulation experiment was embedding rejuvenated algae-promoting strains of bacteria, Exiguobacterium sp.013 and Bacillus sp.D06, separately, with hypopuses of Microcystis aeruginosa, M.s flos-aqua and M. wesenbergii in wet sediment to compare effects of the formers on anabiosis of the latters Results show that as affected by E.sp013 the hypopuses of Microcystis aeruginosa, Microcystis flos-aqua and Microcystis wesenbergii started to resuscitate at a temperature 1℃ lower than that in their control groups, respectively. (11℃, 12℃ and 12℃, respectively), while B.spD06 did not have such an effect, but it did increase   resuscitation rates of the hypopuses. Under the same condition, E.sp013 was stronger than B.spD06 in effect of promoting resuscitation of the hypopuses. But both of them advanced resuscitation of the hypopuses in time by one day. No significant difference was found between the two strains of bacteria and between the three kinds of Microcystis in this effect (Duncans multiple range test, P> 0.05). The experiment also reveals that E.sp013 and B.spD06 bacteria reduced N\P ratio in the waterbody through their ability to assimilate N nutrient, thus removing N from the waterbody, which may be the reasons why the 2 strains of bacteria can promote resuscitation of the hypopuses of the 3 kinds of Microcystis.

Key words:  Algae-promoting bacteria, Microcystis, hypopus, resuscitation