This article presents a graphical approach to the genetical theory of sex change (similar to one recently applied to the evolution of simultaneous hermaphroditism). The graphs will help clarify a set of predictions to be tested against data from Pandalid shrimp. These shrimp are protandrous hermaphrodites (reproduce first as males). The goal is to use the genetical theory to predict the age of sex change. Since these shrimp show much geographic variation in this age, they provide a good opportunity to test the evolutionary model.
hermaphrodites, sequential hermaphroditism, evolutionarily stable strategy, genetical theory of sex change, protandry, Pandalid shrimp
Charnov, E.L. 1979. Natural selection and sex change in Pandalid shrimp: Test of a life history theory. American Naturalist 113:715-734