Population stochasticity, random determination of handedness, and the genetic basis of antisymmetry

Kamimura, Yoshitaka

doi:10.1016/j.jtbi.2011.08.021

Cited by 3 publications

(2 citation statements)

References 40 publications

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“…Although this evolutionary pattern (from random AS to genetically controlled DA) is common among animals (Palmer ), the underlying processes remain unclear. Recently, a theoretical model was proposed to explain the apparent absence of a genetic basis in empirical examples of AS (Kamimura ). The theory predicts the coexistence of two types of genes, handedness genes that determine chirality (right‐ and left‐morphs) and randomization genes that randomize chirality, in a population in which negative frequency‐dependent selection works on the two morphs.…”

Section: Discussionmentioning

confidence: 99%

Pre‐ and postcopulatory sexual selection and the evolution of sexually dimorphic traits in earwigs (Dermaptera)

Kamimura

2013

Entomological Science

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Dermaptera (earwigs) is a relatively small polyneopteran order with approximately 2200 described species. They are characterized by a pair of forceps, which are hardened, unsegmented cerci at the caudal end of the abdomen. In most species, males have more exaggerated forceps than females, indicating an effect of sexual selection on them. Earwigs also exhibit astonishing diversity in the number, laterality and size of both male and female genital components. This characteristic has promoted the study of postcopulatory sexual selection in several representative species. Here, previous studies of earwigs that examined pre-and postcopulatory sexual selection are reviewed in detail. Related topics included here are sexually antagonistic coevolution, evolution of laterally asymmetrical morphologies, and developmental aspects of intra-sexually dimorphic traits. A new terminology system for male genitalia is also proposed.

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Section: Discussionmentioning

confidence: 99%

Pre‐ and postcopulatory sexual selection and the evolution of sexually dimorphic traits in earwigs (Dermaptera)

Kamimura

2013

Entomological Science

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“…Dimorphism in a population arises from genetic and/or environmental factors (Zera & Denno ). However, few studies have elucidated the mechanism that maintains chiral dimorphism in a population (but see Jesson & Barrett ; Schilthuizen et al ; Kamimura ). Thus, the present study first aims to examine whether chiral dimorphism in the copulatory bursa is common in local populations of P. mikado , and second whether chiral dimorphism in female genitalia affects mating behavior or not.…”

Section: Numbers Of Two Forms Of Parapodisma Mikado Females Collectedmentioning

confidence: 99%

Dimorphism of right–left asymmetry in the female genitalia of the brachypterous grasshopper Parapodisma mikado (Orthoptera: Acrididae)

Shimizu

Sugano

Tsuchiya-Suzuki

et al. 2016

Entomological Science

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Several insects exhibit morphological asymmetry in the mouthparts or genitalia. In a part of species with asymmetric genitalia, two mirror‐image forms of the genitalia are reported to occur in a population. This dimorphism, called chiral dimorphism, is usually observed in male genitalia, but its examples in female genitalia are very limited. Here, we report that the females of the brachypterous grasshopper Parapodisma mikado are equipped with an asymmetric sclerite in the copulatory bursa, and that two mirror‐image forms of the sclerite occur in local populations. This dimorphism was detected in all of seven populations examined, and the ratio of the two forms was approximately 2:1 for the right : left forms. In one population, the ratio of the two forms did not vary among three consecutive years. Thus, chiral dimorphism in the female genitalia is kept almost constant spatiotemporally. Mating experiments indicated that the direction of female genitalia did not affect the direction to which the males twist their abdomen (right or left side) during mating or the duration of mating. We propose two hypotheses, a neutral developmental mechanism and sexual conflict, for the maintenance of chiral dimorphism in the genitalia of P. mikado females.

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Random or handedness? Use of laterally paired penises inNalaearwigs (Insecta: Dermaptera: Labiduridae)

Kamimura

Matsumura

Yang

et al. 2021

Biological Journal of the Linnean Society

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Animals can show bias in their use of laterally paired organs that do not have any conspicuous anatomical differentiation between the right and left organs. Like right handedness in humans, males of the giant earwig Labidura riparia (Labiduridae: Labidurinae) preferentially (~90%) use the right one of their laterally paired penises for copulation. To elucidate the evolutionary origin of this lateralization, patterns of penis use were examined for the related species of the genus Nala (Labiduridae: Nalinae). In multiple populations and broods of both Nala lividipes and Nala nepalensis, males that were ready to use the right or left penis were equally frequent, providing a striking contrast to Labidura. Surgical ablation of one of the two penises revealed that both penises are functionally competent in N. lividipes. Nevertheless, each male almost consistently used only one of the paired penises, either the right or the left one. Changes in penis use were estimated to occur only once per 64–143 days per male. The present study is the first report of individual-level lateralization for animal genitalia that do not show any conspicuous anatomical differentiation between the right and left organs. Possible advantages of lateralization are discussed in relationship to co-evolution of the genitalia between the sexes.

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Population stochasticity, random determination of handedness, and the genetic basis of antisymmetry

Cited by 3 publications

References 40 publications

Pre‐ and postcopulatory sexual selection and the evolution of sexually dimorphic traits in earwigs (Dermaptera)

Pre‐ and postcopulatory sexual selection and the evolution of sexually dimorphic traits in earwigs (Dermaptera)

Dimorphism of right–left asymmetry in the female genitalia of the brachypterous grasshopper Parapodisma mikado (Orthoptera: Acrididae)

Random or handedness? Use of laterally paired penises inNalaearwigs (Insecta: Dermaptera: Labiduridae)

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