The Variation in Slope of Concentration-Effect Relationship

摘要

Implementing the variation within populations in ecological modeling of risk and effects of toxicants could contribute to a more sophisticated way of modeling. To give insight into the magnitude and spread in sensitivity within test populations the variation in sensitivity of individuals expressed as the slope of a concentration-effect curve(Sm)within more than 300 test populations from toxicity tests with 36 species and 116 substan- ces is analyzed. The overall a average variation from this study is 0.65(Sm)and corresponds to an EC_50/EC_5 ratio of 2.9.