This best-selling ecology book continues to present ecology as a series of problems for readers to critically analyze. No other book presents analytical, quantitative, and statistical ecological information in an equally accessible style. Reflecting the way ecologists actually practice, the book emphasizes the role of experiments in testing ecological ideas and discusses many contemporary and controversial problems related to distribution and abundance. Throughout the book, Krebs thoroughly explains the application of mathematical concepts in ecology while reinforcing these concepts with research references, examples, and interesting end-of-chapter review questions. Thoroughly updated, the book includes new chapters on disease ecology (15) and the human impact on ecosystem health (28). Chapters on conservation biology, community organization, and primary production are extensively revised, and coverage of evolutionary and functional biology is more integrated. Thirty-four new essays provide interesting insights into relevant topics, exploring some of the problems ecologists deal with in their attempt to understand nature. For anyone interested in ecology.