The maintenance of clinal variation for shell color phenotype in the flat periwinkle Littorina obtusata

Phifer-Rixey, M., Heckman, M., Trussell, G., and P.S. Schmidt. The maintenance of clinal variation for shell color phenotype in the flat periwinkle Littorina obtusata. Society for the Study of Evolution, Minneapolis, MN. June 2008.