Figure 2From: The complex dynamics of a stochastic toxic-phytoplankton-zooplankton model(Left) Time-series plots; (Right) phase portraits for model ( 1 ) with r=4, m=0.5, a=0.9, b=0.7, c=0.1, d=0.2 and initial condition ( P 0 , Z 0 )=(0.1,0.6). (A) K=0.7< K H =0.7857; (B) K= K H , a limit cycle occurs; (C) K=1.0> K H .Back to article page