The effects of copulation duration in the bruchid beetle Callosobruchus maculatus

Edvardsson, Martin; Cañal, David

doi:10.1093/beheco/arj045

Cited by 122 publications

(90 citation statements)

References 34 publications

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“…In C. maculatus, females vigorously kick males with their hind legs during mating [42] and this behaviour reduces the copulation duration [43]. Ejaculate size increases with copulation duration and contributes to male reproductive success because it increases female fecundity [44]. Males that are able to copulate for longer and/or produce larger ejaculates would increase their reproductive fitness but suffer a longevity cost [38].…”

Section: Resultsmentioning

confidence: 99%

Sexes suffer from suboptimal lifespan because of genetic conflict in a seed beetle

2012

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Males and females have different routes to successful reproduction, resulting in sex differences in lifespan and age-specific allocation of reproductive effort. The trade-off between current and future reproduction is often resolved differently by males and females, and both sexes can be constrained in their ability to reach their sex-specific optima owing to intralocus sexual conflict. Such genetic antagonism may have profound implications for evolution, but its role in ageing and lifespan remains unresolved. We provide direct experimental evidence that males live longer and females live shorter than necessary to maximize their relative fitness in Callosobruchus maculatus seed beetles. Using artificial selection in a genetically heterogeneous population, we created replicate long-life lines where males lived on average 27 per cent longer than in short-life lines. As predicted by theory, subsequent assays revealed that upward selection on male lifespan decreased relative male fitness but increased relative female fitness compared with downward selection. Thus, we demonstrate that lifespan-extending genes can help one sex while harming the other. Our results show that sexual antagonism constrains adaptive life-history evolution, support a novel way of maintaining genetic variation for lifespan and argue for better integration of sex effects into applied research programmes aimed at lifespan extension.

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Section: Resultsmentioning

confidence: 99%

Sexes suffer from suboptimal lifespan because of genetic conflict in a seed beetle

2012

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“…In C. maculatus, a species closely related to C. chinensis, a trend for decreasing female remating propensity with increasing ejaculate weight was found (Edvardsson and Canal 2006). Also, males of the common dung fly, Sepsis cynipsea copulated longer with females, for example older females and mated females, for which the risk of sperm competition was expected to be higher (Martin and Hosken 2002).…”

Section: Hosken and Wardmentioning

confidence: 99%

Strategic ejaculation and level of polyandry in Callosobruchus chinensis (Coleoptera: Bruchidae)

Yamada

Miyatake

2007

J Ethol

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Variation in the level of polyandry of females produces a difference in the risk of sperm competition among males. As a consequence, investment in ejaculate expenditure by males should vary. We compared the number of sperm ejaculated by males into the female reproductive organ of six strains of the adzuki bean beetle, Callosobruchus chinensis (Coleoptera: Bruchidae), when males were reared at different larval densities in a bean. A significant positive correlation was found between the remating frequency of females and the ratio of the ejaculate sizes of high-density and low-density males as a measure of the response to the risk of sperm competition among males. The measure was estimated by dividing the number of sperm ejaculated by males reared at high larval density in a bean with the number of sperm ejaculated by males reared alone. The number of sperm transferred by a male to a female was not correlated with the duration of copulation. The results suggest an evolutionary relationship between ejaculatory expenditure and the level of polyandry in C. chinensis.

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“…These issues may hamper the identification of the processes of sexual selection acting on variation in these traits, thereby limiting the certainty of inferences about their evolution (Bertin and Fairbairn 2007). For example, while it is known that male genital spines in the seed beetle Callosobruchus maculatus damage the female during mating, the consequences of between-male variation in this trait remain unclear (Morrow et al 2003;Edvardsson and Tregenza 2005;Edvardsson and Canal 2006).…”

Section: Introductionmentioning

confidence: 99%

Longer exaggerated male genitalia confer defensive sperm-competitive benefits in an earwig

Lieshout

Elgar

2010

Evol Ecol

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As evidence mounts that male genitalia can affect relative fertilisation success, the role that sexual selection has played in the rapid and divergent evolution of genitalia is becoming increasingly recognized. Unfortunately, the limited functional understanding of these complex structures and their interactions with the female reproductive tract often limit interpretation regarding their evolution. Here, we address this issue using the earwig Euborellia brunneri, where both the male intromittent organ and the female spermatheca are highly exaggerated in length yet structurally simple. In a double mating design, we use the sterile male technique to study how sperm precedence patterns are affected by male genital length, male age, and the size of the male sperm storage organ, the seminal vesicle. Relative fertilisation success exhibited considerable variation around modest last-male paternity. Only an interaction between first and second male genital length affected paternity, where males gained reduced paternity when preceded by rivals with longer genitalia. Longer genitalia confer defensive benefits in sperm competition by apparently depositing ejaculate deeper in the tubular spermatheca, safe from removal by rivals. Paternity similarly depended on an interaction between the ages of both males, likely mediated by sperm traits as testes size decreased with age. Seminal vesicle size showed positive allometry but did not affect paternity; instead, greater seminal vesicle size in last males expedited oviposition. The exaggerated yet relatively simple genitalia of E. brunneri facilitate an unusually clear example of post-copulatory selection on phenotypic variation in multiple reproductive traits.

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The effects of copulation duration in the bruchid beetle Callosobruchus maculatus

Cited by 122 publications

References 34 publications

Sexes suffer from suboptimal lifespan because of genetic conflict in a seed beetle

Sexes suffer from suboptimal lifespan because of genetic conflict in a seed beetle

Strategic ejaculation and level of polyandry in Callosobruchus chinensis (Coleoptera: Bruchidae)

Longer exaggerated male genitalia confer defensive sperm-competitive benefits in an earwig

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