Life on the edge—a changing genetic landscape within an iconic American pika metapopulation over the last half century 1Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, Massachusetts, United States 2Department of Life Sciences, Santa Monica College, Santa Monica, California, United States 3Department of Biological Sciences, Fordham University, Bronx, New York, United States 4Department of Plant Sciences, University of California, Davis, Davis,...