Maintenance of clinal variation for shell colour phenotype in the flat periwinkle Littorina obtusata

Phifer-Rixey, M., Heckman, M., Trussell, G. and P.S. Schmidt. 2009. Maintenance of clinal variation for shell colour phenotype in the flat periwinkle Littorina obtusata. Journal of Evolutionary Biology. https://onlinelibrary.wiley.com/doi/full/10.1111/j.1420-9101.2008.01549.x