This course explores the diverse trophic ecologies observed in terrestrial, freshwater and marine consumers, and how these ecologies interact to form complex food webs in each biome. Students will learn how to measure consumer niche width, trophic interactions and food web structure using consumer diet, stable isotope ratios and essential fatty acid profiles. Finally, the course examines the effects of environmental stressors such as climate change, biological invasions and land use on food web structure. Enrolling students must be undertaking a project relevant to the course. The graduate version of this course will use the same structure as the undergraduate version (BIOL4393), with an additional term paper set by the instructor worth 24% of the final mark. Limited enrolment, permission of instruction required. Students who have completed BIOL4393 are not eligible to take BIOL6393.