JOHN W. TUNNELL JR. is associate director and Harte Research Scientist at the Harte Research Institute for Gulf of Mexico Studies in Corpus Christi, where he is also director of the Center for Coastal Studies and professor of biology at Texas A&M University–Corpus Christi. ERNESTO A. CHáVEZ is a scientist and professor at the Interdisciplinary Center for Marine Science, National Polytechnic Institute in La Paz, Baja California. He is widely published and has helped create a number of scientific research centers and graduate programs in Mexico. KIM WITHERS is associate research scientist at the Center for Coastal Studies and an adjunct professor of biology and environmental science at Texas A&M University–Corpus Christi.