Plasticity of size and allometry in multiple sexually selected traits in an armed beetle Gnatocerus cornutus

Okada, K.; Miyatake, Takahisa

doi:10.1007/s10682-010-9370-9

Cited by 35 publications

(61 citation statements)

References 54 publications

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“…This population has since been maintained on wholemeal flour enriched with yeast (see [41,42] for details). These beetles are stored product pests therefore, laboratory conditions were tailored to closely mimic natural conditions.…”

Section: Methodsmentioning

confidence: 99%

Sexual conflict over mating in Gnatocerus cornutus ? Females prefer lovers not fighters

et al. 2014

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Female mate choice and male-male competition are the typical mechanisms of sexual selection. However, these two mechanisms do not always favour the same males. Furthermore, it has recently become clear that female choice can sometimes benefit males that reduce female fitness. So whether malemale competition and female choice favour the same or different males, and whether or not females benefit from mate choice, remain open questions. In the horned beetle, Gnatocerus cornutus, males have enlarged mandibles used to fight rivals, and larger mandibles provide a mating advantage when there is direct male-male competition for mates. However, it is not clear whether females prefer these highly competitive males. Here, we show that female choice targets male courtship rather than mandible size, and these two characters are not phenotypically or genetically correlated. Mating with attractive, highly courting males provided indirect benefits to females but only via the heritability of male attractiveness. However, mating with attractive males avoids the indirect costs to daughters that are generated by mating with competitive males. Our results suggest that male-male competition may constrain female mate choice, possibly reducing female fitness and generating sexual conflict over mating.

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Section: Methodsmentioning

confidence: 99%

Sexual conflict over mating in Gnatocerus cornutus ? Females prefer lovers not fighters

et al. 2014

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“…Other organs, such as horns in dung and rhinoceros beetles (Emlen, 1997b; Emlen et al, 2012) and mandibles in stag and broad horned flour beetles (Okada and Miyatake, 2010; Gotoh et al, 2011), show exaggerated responses to nutrition. In these organisms, large males have disproportionately larger horns or mandibles for their body size than small males.…”

Section: Tissue-specific Sensitivities To Iis/tor Signalingmentioning

confidence: 99%

Mechanisms regulating nutrition-dependent developmental plasticity through organ-specific effects in insects

Kaburagi¹,

Mendes²,

Mirth³

2013

Front. Physiol.

112

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Nutrition, via the insulin/insulin-like growth factor (IIS)/Target of Rapamycin (TOR) signaling pathway, can provide a strong molding force for determining animal size and shape. For instance, nutrition induces a disproportionate increase in the size of male horns in dung and rhinoceros beetles, or mandibles in staghorn or horned flour beetles, relative to body size. In these species, well-fed male larvae produce adults with greatly enlarged horns or mandibles, whereas males that are starved or poorly fed as larvae bear much more modest appendages. Changes in IIS/TOR signaling plays a key role in appendage development by regulating growth in the horn and mandible primordia. In contrast, changes in the IIS/TOR pathway produce minimal effects on the size of other adult structures, such as the male genitalia in fruit flies and dung beetles. The horn, mandible and genitalia illustrate that although all tissues are exposed to the same hormonal environment within the larval body, the extent to which insulin can induce growth is organ specific. In addition, the IIS/TOR pathway affects body size and shape by controlling production of metamorphic hormones important for regulating developmental timing, like the steroid molting hormone ecdysone and sesquiterpenoid hormone juvenile hormone. In this review, we discuss recent results from Drosophila and other insects that highlight mechanisms allowing tissues to differ in their sensitivity to IIS/TOR and the potential consequences of these differences on body size and shape.

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“…courtship and ornaments) also show condition dependence (Simmons, 1993;Delisle & Hardy, 1997;Emlen, 1997;Droney, 1998;Wagner & Hoback, 1999;Wilkinson & Taper, 1999;Okada & Miyatake, 2010a). However, within the same individual, different sexual traits sometimes show different responses to its condition (Okada & Miyatake, 2010a). There is abundant empirical evidence for condition-dependent expression of male sexual traits (i.e.…”

Section: Introductionmentioning

confidence: 99%

Impacts of diet quality on life‐history and reproductive traits in male and female armed beetle, Gnatocerus cornutus

Katsuki

Okada

2012

Ecological Entomology

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1. The energy available for reproduction is usually limited by resource acquisition (i.e. condition). Because condition is known to be strongly affected by environmental factors, reproductive investments also vary across heterogeneous environments.2. Although the condition dependence of reproductive investment is common to both sexes, reproductive traits may exhibit sexually different responses to environmental fluctuation due to sex-specific life-history strategies. However, few direct experimental studies have investigated the condition dependence of reproductive investments in both sexes.3. We investigated the condition dependence of life-history and reproductive traits of males and females in the beetle Gnatocerus cornutus Fabricus by manipulating larval and adult diet quality. We found that male and female life-history traits exhibited similar responses to environmental fluctuations.4. By contrast, the sexes exhibit different patterns of condition dependence in reproductive traits (i.e. the adult nutritional environment has a strong impact on the female lifetime reproductive success, whereas larval nutritional environment strongly affects the secondary sexual trait in males).5. This difference in the plasticity of reproductive traits may lead to different selection pressures for each sex, even if both sexes develop and/or live in the same environment.

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Plasticity of size and allometry in multiple sexually selected traits in an armed beetle Gnatocerus cornutus

Cited by 35 publications

References 54 publications

Sexual conflict over mating in Gnatocerus cornutus ? Females prefer lovers not fighters

Sexual conflict over mating in Gnatocerus cornutus ? Females prefer lovers not fighters

Mechanisms regulating nutrition-dependent developmental plasticity through organ-specific effects in insects

Impacts of diet quality on life‐history and reproductive traits in male and female armed beetle, Gnatocerus cornutus

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