This course examines the characteristics of populations, communities and ecosystems in terms of energy flow, biogeochemistry and multivariate interactions (biotic and abiotic). The course will demonstrate the role of evolution in ecosystem composition, structure and function. The nature of the major North American Biomes will also be discussed with an emphasis on the importance of biodiversity and the interdependence of living things. Two weekend field trips are required. Also offered during the summer at the G.H. Gordon Biological Station. Prerequisites: BIO 101 or 201, or consent of instructor.