The costs of harassment in the adzuki bean beetle

Sakurai, Gen; Kasuya, Eiiti

doi:10.1016/j.anbehav.2007.09.010

Cited by 67 publications

(47 citation statements)

References 28 publications

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“…So it appears that even if females are able to mate with the males they prefer, they do not gain or lose any fecundity or longevity (from single matings). Male attractiveness often signals direct benefits to females [47,70,71], but mating with preferred males can also negatively impact female fitness [48,72]. In the beetles, neither of these situations applied, but we also restricted mating opportunities and it is possible that either phenotype (attractive/competitive) could coerce females into mating more than is optimal with additional mating opportunities [73].…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

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

et al. 2014

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“…Usually, they are reared with only beans without adult foods and water. Life-history traits like longevity and fecundity have usually been measured under starvation conditions in Callosobruchus chinensis (Giga and Smith 1983;Yanagi and Miyatake 2003;Sakurai and Kasuya 2008). In addition, the intensity of death feigning among other beetles is affected by starvation (Acheampong and Mitchell 1997;Miyatake 2001b).…”

Section: Beetlesmentioning

confidence: 99%

Positive genetic correlations between life-history traits and death-feigning behavior in adzuki bean beetle (Callosobruchus chinensis)

Nakayama

Miyatake

2008

Evol Ecol

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Usually, several traits in organisms are genetically linked with each other; thus, correlated responses to selection are generally observed. Anti-predator behaviors may be genetically correlated with other traits such as life-history. We compared the life-history traits of individuals derived from two regimes artificially selected for the duration of death feigning in the adzuki bean beetle, Callosobruchus chinensis. The two-way selected regimes include the L-lines with stronger intensity (longer duration and higher frequency) and the S-lines with weaker intensity (shorter duration and lower frequency) of death feigning. L-lines exhibited greater longevity, higher rates of emergence, laid bigger eggs and greater reproductive effort, and also had a tendency of faster development. Fecundity was not significantly different between L-and S-lines. These results provide the novel possibility that death feigning is a potentially advantageous anti-predator behavior that, through a positive genetic correlation with some life-history traits, can bring a higher fitness to an individual adopting this behavior. This novel aspect might explain why deathfeigning behavior is prevalent in various taxonomic animal groups.

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“…By contrast, male sexual coercion imposes fitness cost on females. For example, male sexual harassment reduces female feeding time, which results in low reproductive success of females (e.g., Magurran and Seghers 1994;Liana 2005;Sakurai and Kasuya 2008). In this study, I first examined whether T. urticae males prefer virgin females to mated females and whether males attempt to copulate with mated females.…”

Section: Introductionmentioning

confidence: 99%

Males of the two-spotted spider mite attempt to copulate with mated females: effects of double mating on fitness of either sex

Oku

2009

Exp Appl Acarol

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In Tetranychus urticae (Acari: Tetranychidae), when the intervals between first and second copulation are more than 24 h, only the first copulation is effective for females. Therefore, adult males should copulate only with virgin females, but not with females that copulated more than 1 day ago. Indeed, T. urticae males preferred virgin females to mated females under dual choice conditions. In the absence of virgin females, however, 60% of males copulated with mated females (n = 30). Therefore, the effects of male copulation behaviour on male and mated-female fitness were examined, respectively. Since T. urticae is arrhenotokous (i.e., only daughters have genes derived from their father), the proportion of females among the offspring was used as an index of male fitness. After males had lived with/without a mated female, the males were allowed to copulate with a virgin female. The proportion of females among the offspring did not differ between males with and without a female. On the other hand, when mated females lived with an adult male, their egg production was lower than mated females without a male. These results suggest that males do not seem to obtain fitness benefit from the copulation behaviour and that mated females incur a fitness cost due to the male behaviour.

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The costs of harassment in the adzuki bean beetle

Cited by 67 publications

References 28 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

Positive genetic correlations between life-history traits and death-feigning behavior in adzuki bean beetle (Callosobruchus chinensis)

Males of the two-spotted spider mite attempt to copulate with mated females: effects of double mating on fitness of either sex

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