This landmark text helped to define introductory ecology courses for over four decades. With a dramatic transformation, Ecology: The Economy of Nature, Seventh Edition becomes the first textbook to fully embrace the challenges and opportunities of teaching ecology today. The text　maintains its signature evolutionary perspective and emphasis on the quantitative aspects of the field, but it has been completely rewritten for today's undergraduates--with extensive new pedagogy, fresh examples (including more aquatic coverage), and fully integrated media resources. See what's in the LaunchPad