From the reviews: The purpose of the book . . .is to equip researchers with the essential tools of isotope research ... . creates the basis for a graduate and post-graduate course in stable isotope ecology. ... Fry's understanding of the world of stable isotope ecology is impressive and extensive ... . Fry does an excellent job of conveying to the reader the proper use of isotopes as they circulate within the biosphere, as well as introducing the exciting world of isotope ecology. (Zachary T. Aanderud, Ecology - The Ecological Society of America, Vol. 88 (3), 2007) Brian Fry who has now produced a very timely contribution of eight chapters that are designed to introduce novice graduate students to the field of stable isotope ecology.... Additional resource material is supplied...figures, color versions of cartoons, and problem sets...this would make an excellent primary textbook for a graduate course and will be enjoyed by both isoPopes and isotopeteers. (Keith A. Hobson, Quarterly Review of Biology, Vol. 82, September, 2007)