Choosy males could help explain androdioecy in a selfing fish.

Abstract excerpt

Androdioecy (the coexistence of males and hermaphrodites) is considered a transitional state derived from pure hermaphroditism or dioecy, but the processes selecting for this rare breeding system are unclear, particularly in animals. In androdioecious species, the proportion of males in relation to hermaphrodites is usually so reduced that it is not known whether there is scope for mate choice, particularly when...

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