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Hermaphrodite models/sex

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Comments(5)

  • Nikorn wrote 37 days ago:

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  • Dulrajas wrote 139 days ago:

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  • Aragami wrote 72 days ago:

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  • Mazull wrote 129 days ago:

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    We examined whether gender role in the simultaneous hermaphrodite freshwater snail, Physa acuta , is determined by relative body size in a manner predicted by the size-advantage model. We observed the body-size combinations of pairs in the laboratory by using field-collected populations. Small individuals had a significant tendency to act as the male and positively selected large snails as the female partner in both triple combinations. However, the large individual acted as both the male and the female with nearly equal frequency. In the size-differing pairings, copulations occurred after fewer male approaches and fewer rejections than in pairings involving two large snails, suggesting that body size difference is one of the behavioral solutions in gender conflict.
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    Sexual Conflict in Hermaphrodites

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    Hermaphrodite - Wikipedia

    Theoretical and empirical studies of sex allocation usually treat sequential and simultaneous hermaphroditism as distinct and disparate forms of allocation. However, the sexual patterns of numerous species have both sequential e. In most cases, we have drawn from sex allocation theory developed for sequential hermaphrodites to explain ontogenetic changes in allocation and from theory developed for simultaneous hermaphrodites to explain the remaining aspects of these sexual patterns rather than develop a more integrated theory. Here I present the evolutionary stable solution ESS to a dynamic statevariable model that explicitly combines the effects of size and simultaneous allocation to male and female function in a dynamic game. The model structure and initial parameter values are based on the sexual pattern of the blue-banded goby, Lythrypnus dalli, a simultaneous hermaphrodite. I then compare the natural patterns of sex allocation in L.
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    Sequential hermaphroditism

    Sex allocation theory is developed for hermaphrodites having frequent copulations and long-term sperm storage. Provided the sperm displacement mechanisms are similar to those known in insects, the ESS allocation to sperm versus eggs satisfies a rather simple rule. There are no data to test this rule, as yet. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve.
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    Hermaphrodites combine the male and female sex functions into a single individual, either sequentially or simultaneously. This simple fact means that they exhibit both similarities and differences in the way in which they experience, and respond to, sexual conflict compared to separate-sexed organisms. Here, we focus on clarifying how sexual conflict concepts can be adapted to apply to all anisogamous sexual systems and review unique or especially important aspects of sexual conflict in hermaphroditic animals. These include conflicts over the timing of sex change in sequential hermaphrodites, and in simultaneous hermaphrodites, over both sex roles and the postmating manipulation of the sperm recipient by the sperm donor.
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