Karen Ames Lecture Series in Applied Mathematics Dr. T. G. Hallam Department of Ecology and Evolutionary BiologyUniversity of Tennessee Knoxville March 8, 2008109 Shelby Center3:00 PM (Refreshments at 2:30 in the lobby) Abstract The Brazilian free tailed bats (Tadarida brasiliensis) of Mexico and Texas are a wonder of the world. Gigantic in number, their emergences are spectacular and their contributions to agriculture of Texas are significant. First, we develop some approximate laws of emergence behavior, use these laws to simulate an emergence, and apply a counting procedure to simulation videos to provide an error basis for determining the numbers of bats in an emergence video. Second, we investigate the ecologic and economic role of bats in cotton agroecosystems in the Winter Garden Area of south-central Texas by studying a food web model. We will demonstrate that bats have a significant impact on the agricultural pests, even in genetically modified cotton, and ultimately are an important part of integrated pest management. Biographical Sketch Dr. T. G. Hallam is currently a research Professor Emeritus of Ecology and Evolutionary Biology at the University of Tennessee Knoxville. Dr. Hallam has served as Head of the Department of Ecology and Evolutionary Biology, Professor of Mathematics, Director of The Institute for Environmental Modeling, University of Tennessee, Knoxville, and as Director for many Autumn Courses and Workshops in Mathematical Ecology, at the International Center for Theoretical Physics in Trieste Italy (These courses are especially for scientists from developing countries). Dr. Hallam's publications total over 145 reviewed articles, five edited books with articles in areas ranging from ecology, mathematics, mathematical ecology, and environmental toxicology. He has served on numerous scientific advisory boards and was on the editorial board of several journals.