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Sex change and sexual selection

Many writers have discussed sequential hermaphroditism, wherein individuals are all born of one sex and change to the other as they grow older, in terms of its advantage to the species (1). Ghiselin (2) shifted the focus by suggesting that if members of one sex increase in fertility more rapidly with age than those of the other, then natural selection will favor a genotype whose individuals are all born into the sex that suffers less from being young (the sex whose fertility increases