Joseph A. Travis is an American Professor of Biological Science and past Dean of the College of Arts & Sciences at Florida State University. His research studies the ecology of natural selection using experimental techniques. His studies focus on a number of specific problems ranging from the differences in inflorescence size among populations of the flypoison lily, Zigadenus (Amianthium) muscatoxicus in Virginia to the striking divergence in body size in north Florida populations of the sailfin molly, Poecilia latipinna. Populations of least killifish vary widely in density as well as in the form and amplitude of their fluctuations in population density, and in recent work Travis has identified which ecological factors are responsible for these differences in density regimes and what migh