The discrimination of alternative male morphologies

Male dimorphisms represent alternative selective regimes within a sex. As s uch, they can be used as a powerful tool in testing evolutionary theory. Ho wever, to realize this potential, we need to be able to accurately discrimi nate individuals into two separate morphs. In this article we discuss the e xisting methods and propose a new one. We test our method with data from th ree dimorphic species and compare these results to results with existing me thods. We conclude that existing methods often misclassify a large proporti on of individuals, but applying our method notably reduces these errors.