0. Introduction - Ecologist in Wonderland -- Part 1. Linking Ecotoxicology and Ecology -- Chapter 1. Basic Concepts of Ecological Risk Assessment -- Chapter 2. Population-level assessment -- Chapter 3. Population models of extinction -- Chapter 4. Population level assessment using the canonical model -- Part 2. Models for ecotoxicology -- Chapter 5. Species Sensitivity Distribution in Ecological Risk Assessment -- Chapter 6. BLM: A model for predicting metal toxicities -- Chapter 7.Mathematical models for chemical mixtures -- Chapter 8.Statistics and related topics.