In the present study, we selected the common
freshwater green alga
Scenedesmus obliquus
as the candidate
cyanobacteria-control species by its allelopathic
effect. The most common cyanobacterial species
Microcystis aeruginosa
was used as the target organism. The
population growth of
M. aeruginosa was inhibited by the
green alga-conditioned media significantly. The influence
was stronger when media concentrations increased from
0 to 100 %. In contrast, there was a strong and significant
positive effect of the culture media from
M. aeruginosa on
the growth of green alga. Our results are useful and valuable
as the experimental evidence for producing new
cyanobacterial inhibitors and applying new environmentalfriendly
biological control methods in future. For one
thing, we could use the green alga-condition media but not
the green alga itself to inhibit the growth of
M. aeruginosa.
For another, although cyanobacteria are harmful for the
environment, the condition media from cyanobacteria
could also be viewed as the resource to stimulate the
growth of
S. obliquus, which is advantaged for gaining
more green alga-condition media and food for fish.
