Fig. 8.1 Variation of NOEC on same chemical agent
*When ecosystemic sensitivity is assumed to be normally distributed, and because the sensitivity
varies according to the exposure of the ecosystem to the same chemical substance and demand, the
standard deviation (σ) of the sensitivity distribution from experimental data is equal to 0.51, that is,
the density that only σ moved the mean is equivalent to density to protect ecosystemic 84%. When
the standard deviation of the regression lines of both the correlation of the NOEC in the microcosm
160
K. Kakazu et al.
*When ecosystemic sensitivity is assumed to be normally distributed, and because the sensitivity
varies according to the exposure of the ecosystem to the same chemical substance and demand, the
standard deviation (σ) of the sensitivity distribution from experimental data is equal to 0.51, that is,
the density that only σ moved the mean is equivalent to density to protect ecosystemic 84%. When
the standard deviation of the regression lines of both the correlation of the NOEC in the microcosm
160
K. Kakazu et al.