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

Katsuki, Masako; Okada, Yasukazu; Okada, K.

doi:10.1111/j.1365-2311.2012.01390.x

Cited by 28 publications

(30 citation statements)

References 62 publications

(173 reference statements)

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“…We also show that the absolute response of the mandibles to the intake of P and C in the larval diet of G. cornutus was stronger compared to a primary sexual trait and a nonsexual trait, as predicted for an exaggerated trait that is condition dependent. This heightened sensitivity of the mandibles to nutrition is consistent with previous work (Katsuki, Okada & Okada ) and shows that a C‐rich larval diet is likely to enhance male fitness. In a contrasting invertebrate system, abundant P in the larval diet of the neriid fly Telostylinus angusticollis is essential for the expression of sexually selected characters.…”

Section: Discussionsupporting

confidence: 91%

Macronutrient balance mediates the growth of sexually selected weapons but not genitalia in male broad‐horned beetles

et al. 2015

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Summary 1.Condition is defined as the pool of resources available to an individual that can be allocated to fitness-enhancing traits. Consequently, condition could influence developmental trade-offs if any occur. Although many studies have manipulated diet to demonstrate condition-dependent trait expression, few studies have determined the contribution of specific nutrients to condition or trade-offs. 2. We used nutritional geometry to quantify the effects of dietary protein and carbohydrate content on larval performance and the development of adult morphology including body size as well as a primary and secondary sexually selected trait in male broad-horned beetles, Gnatocerus cornutus. 3. We found that offspring survival, development rate and morphological traits were highly affected by dietary carbohydrate content and to a lesser extent by protein content and that all traits were maximized at a protein-to-carbohydrate ratio around 1:2. The absolute size of a secondary sexual character, the mandibles, had a heightened response to the increased availability and ratio of both macronutrients. Male genitalia, in contrast, were relatively insensitive to the increased availability of macronutrients. 4. Overall, while nutrition influenced trait expression, the nutritional requirements of development rate and morphological traits were largely the same and resource acquisition seems to implement only weak trade-offs in this species. 5. This finding contrasts with some resource constraint predictions, as beetles seem able to simultaneously meet the nutritional requirements of most traits.

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Section: Discussionsupporting

confidence: 91%

Macronutrient balance mediates the growth of sexually selected weapons but not genitalia in male broad‐horned beetles

et al. 2015

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“…Thus, one could expect larvae to be less sensitive to poor diet than adults, contrary to our findings. On the other hand, our results are in line with previous studies showing that larval nutrition plays a critical role in shaping reproductive traits in many taxa, including flies (Fricke et al ., ), homopterans (Denno & McCloud, ), beetles (Ernsting, Isaaks & Berg, ; Katsuki et al ., ), dragonflies (Sokolovska, Rowe & Johansson, ), spiders (Taylor et al ., ) and butterflies (Cordes et al ., ). Larval dietary conditions are believed to be particularly crucial for organisms in which juvenile food sources differ from those of adults and hence can provide an organism with different nutrient types, such that the effects of poor larval nutrition cannot be compensated by adult feeding (Boggs & Ross, ; O'Brien Boggs & Fogel ).…”

Section: Discussionmentioning

confidence: 99%

“…Variation in individual condition is probably among the most important contributors to high levels of variation in fitness, commonly observed in natural populations (Van Noordwijk & de Jong, ; Reznick, Nunney & Tessier, ). Understanding to what extent various components of fitness (such as life history and sexually selected traits) depend on condition is, therefore, one of the keys to explaining the evolution and diversity of life history and sexual strategies (Rowe & Houle, ; Roff, ; West‐Eberhard, ; Cotton, Fowler & Pomiankowski, ; Tomkins et al ., ; Radwan, ; Katsuki, Okada & Okada, ). Condition is often defined as a pool of resources an individual has acquired and can allocate to the expression of traits that determine its fitness (Rowe & Houle, ).…”

Section: Introductionmentioning

confidence: 99%

Larval and adult nutrition effects on reproductive traits in the red flour beetle

et al. 2017

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Variation in individual condition is probably one of the most critical factors affecting the high levels of diversity in animal fitness components, commonly observed in natural populations. Differential access to nutritional resources, in turn, is among the most important determinants of condition. However, our understanding of how resource access at different stages of life cycle shapes animal traits is still far from comprehensive. Here, we analyzed how larval and adult diet affects key reproductive components of males (mating activity) and females (fecundity) in red flour beetles Tribolium castaneum. Furthermore, we used path analysis to investigate whether the effects of nutritional conditions are mediated by body mass. In males, we found that juvenile, but not adult diet affected mating performance, with males developing on rich diet as larvae achieving higher mating success. In females, on the other hand, these effects interacted: malnutrition at larval stage led to fecundity decline, which was partially alleviated if dietary conditions were improved at the adult stage. Interestingly, the effects of diet on reproductive traits were mostly independent of body mass. These results suggest that larval nutrition may influence reproduction via effects on composition, rather than size, of the adult body.

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“…Lifetime reproductive success (LRS) of each female was scored as the total number of adult offspring emerging from these vials. This provides a good proxy for female LRS (see [36,45,59]), and such proxies of LRS have been used to good effect in other studies [60]. Females were then moved into new vials (40 mm high, 15 mm diameter) containing an excess of the culture medium (4 g) and assessed for survival weekly until death.…”

Section: (A) Direct Effectsmentioning

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

Cited by 28 publications

References 62 publications

Macronutrient balance mediates the growth of sexually selected weapons but not genitalia in male broad‐horned beetles

Macronutrient balance mediates the growth of sexually selected weapons but not genitalia in male broad‐horned beetles

Larval and adult nutrition effects on reproductive traits in the red flour beetle

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

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