A field-intensive seminar exploring human-ecosystem interactions at the land-sea interface in the Caribbean, with Roatan, Honduras, as the focus study site. Many tropical islands are undergoing rapid, uncontrolled development, placing severe local stress on several unique and vulnerable ecosystem types. In addition, human-induced environmental changes on scales up to global also impose stresses. This course examines the normal functioning of these ecosystems, scientific methods to evaluate and characterize ecosystem condition and processes, how human activities interfere with natural cycles in biophysical systems, and what management and policy tools can be applied to reduce impacts. An organizing framework for the course is the close coupling of coastal watersheds and adjacent marine ecosystems, especially coral reefs, mangroves, and seagrass meadows. A major part of the course is a one-week field trip to the Caribbean during spring break. We also meet twice each week before the break to discuss readings and arrange logistics. Student presentations and projects. Class enrollment is limited to ten, and priority is given to F&ES students, with others admitted as space permits. Students are selected during the fall term.