Affiliation: | ∗ Department of Biology, Bowdoin College, Brunswick, ME, U.S.A. † Division of Biological Sciences, University of Montana, Missoula, MT, U.S.A. ‡ Department of Biology, University of Missouri, St Louis, MO, U.S.A. § Department of Biology, University of Massachusetts, Amherst, MA, U.S.A. ∗∗ Department of Biology, Skidmore College, Saratoga Springs, NY, U.S.A. †† Department of Biology, Williams College, Williamstown, MA, U.S.A. |