Simultaneous hermaphroditism and sexual selection

Sexual competition and the evolution of hermaphroditism.

The low density model produced by Tomlinson to describe the evolution of hermaphroditism is shown to undervalue the level of gain to hermaphrodites in small populations. This model is revised to take into account gains for hermaphrodites in breeding units where not only one but where both sexes of gonochorists occur. This revision permits hermaphrodites significant gains in populations as large...

Same sexual system but variable sociobiology: evolution of protandric simultaneous hermaphroditism in Lysmata shrimps.

The sexual system of the decapod (caridean) shrimp Lysmata is protandric simultaneous hermaphroditism (PSH). Individuals first mature as males (male phase = MP) and then when older (larger) change to the external phenotype of female carideans (female phase = FP). However, unlike purely protandric carideans, Lysmata FPs retain reduced male gonadal tissues and ducts, and are able to mate nonrecip...

Solving the complementarity dilemma: evolving strategies for simultaneous hermaphroditism.

We introduce a complementarity dilemma, a two-player, binary response game in which the playoffs are highest when the two players respond differently. Using the classifier EvA, we determine the evolutionary dynamics and structure of strategies that evolve to play an iterated version of this game, and we relate the results to the evolution of major types of sexual reproduction, particularly simu...

Sexual selection gradients change over time in a simultaneous hermaphrodite

Sexual selection is generally predicted to act more strongly on males than on females. The Darwin-Bateman paradigm predicts that this should also hold for hermaphrodites. However, measuring this strength of selection is less straightforward when both sexual functions are performed throughout the organism's lifetime. Besides, quantifications of sexual selection are usually done during a short ti...

Hermaphroditism