Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.|Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.|Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.|Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.|Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.|Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.|Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.|Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.