Age‐dependent investment in death‐feigning behaviour in the sweetpotato weevil <i>Cylas formicarius</i>

Kuriwada, Takashi; Kumano, Norikuni; Shiromoto, Keiko; Haraguchi, Dai

doi:10.1111/j.1365-3032.2010.00777.x

Cited by 20 publications

(14 citation statements)

References 44 publications

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“…The difference in walking ratio between the wild and mass-reared strain may merely reflect the difference in general activity levels of females. Although we did not evaluate the walking activity of the weevil, death-feigning behavior did not differ between the wild and mass-reared strain from Yomitan population (Kuriwada et al, 2010). There is an association between death-feigning behavior and the level of walking activity in several beetle species:…”

Section: Discussionmentioning

confidence: 80%

Laboratory adaptation reduces female mating resistance in the sweet potato weevil

Kuriwada

Kumano

Shiromoto

et al. 2014

Entomologia Exp Applicata

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Selection for genetic adaptation might occur whenever an animal colony is maintained in the laboratory. The laboratory adaptation of behavior such as foraging, dispersal ability, and mating competitiveness often causes difficulties in the maintenance of biological control agents and other beneficial organisms used in procedures such as the sterile insect technique (SIT). Sweet potato weevil, Cylas formicarius (Summers) (Coleoptera: Brentidae), is an important pest in sub‐tropical and tropical regions. An eradication program targeting C. formicarius using SIT was initiated in Japan with weevils being mass‐reared for 95 generations to obtain sufficient sterile males. The mass‐reared strain of C. formicarius exhibits weaker female resistance to male mating attempts compared with the wild strain. This could affect the success of SIT programs because mating persistence of mass‐reared males might be expected to decrease in response to weak female resistance. We show that high success of sperm transfer to mass‐reared females was due to weak female resistance to male mating attempts. However, the mating behavior of mass‐reared males did not change. In C. formicarius, the trait of male persistence to mate was not correlated with the female resistance traits. Our results suggest that mass‐rearing conditions do not have negative effects on the mating ability of the sterile males of this species, and thus that the current mass‐rearing procedures are suitable for production of sterile males for the weevil eradication program.

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Section: Discussionmentioning

confidence: 80%

Laboratory adaptation reduces female mating resistance in the sweet potato weevil

Kuriwada

Kumano

Shiromoto

et al. 2014

Entomologia Exp Applicata

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“…An individual near the end of life should not pass up an opportunity to reproduce, even if fighting is required, if it is unlikely to find another reproductive opportunity. In a similar manner, when the probability of survival is low, individuals of diverse taxa are known to expose themselves to greater risks of predation to prepare to breed (Lafaille et al 2010;Kuriwada et al 2011;Schwanz et al 2012) or to greater risks in defending young (Pavel and Bures 2008;Steinhart et al 2008), consistent with RRV models.…”

Section: Two Models Of Reproductive Effortmentioning

confidence: 73%

Contest behavior and other reproductive efforts in aging breeders: a test of residual reproductive value and state-dependent models

Trumbo

2012

Behav Ecol Sociobiol

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Two models have been proposed to explain agerelated changes in reproductive performance. Statedependent models predict that reproductive effort depends on the magnitude of surplus energy reserves, which often varies with age. Contrary to this prediction, there was no significant effect of starvation on the outcome of contests for carcasses by female Nicrophorus orbicollis despite weight loss by starved females relative to controls. The residual reproductive value (RRV) model predicts that individuals adjust their current reproductive effort based on potential for future reproduction. Younger adults are predicted to restrain reproductive effort because they are less willing to risk their potentially longer reproductive careers. This model was tested empirically for several components of reproduction. Age was found to be strongly correlated with dominance when two similarly sized females discovered a carcass on the same day. Age also had a small positive effect on egg mass and was positively correlated with ovipositing at least one egg. Age did not affect nesting performance (the degree of carcass burial or the value of a prepared carcass for another female). Age also had no effect on fecundity when a female bred alone but was an important factor when two females were in direct competition. Changing RRV related to aging appears to be a robust determinant of contest outcomes in burying beetles, but effects on other components of reproductive effort in the present and previous studies are more variable, perhaps because of effects of changing state.

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“…However, the mating rate, developmental period and fecundity of C. formicarius mass-reared over 70 generations were different from those of the wild strain (Kuriwada et al 2010a(Kuriwada et al , 2011, whereas the death-feigning behaviour of the mass-reared strain was maintained for 71 generations even in the absence of predators (Kuriwada et al 2010b). These facts and the finding of the present study suggest that certain traits are conserved and others show higher evolvability.…”

Section: Discussionmentioning

confidence: 97%

Mass‐rearing conditions do not affect responsiveness to sex pheromone and flight activity in sweetpotato weevils

Kuriwada

Kumano

Shiromoto

et al. 2013

J Applied Entomology

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For ensuring the effectiveness of sterile insect technique (SIT) programmes, maintaining the reproductive competitiveness and dispersal ability of mass‐reared sterile males is essential. Inadvertent selection is an important genetic process that frequently occurs during mass rearing to produce sterile males. We investigated the effect of mass‐rearing conditions on the responsiveness to sex pheromones and spontaneous flight activity of males of the sweetpotato weevil Cylas formicarius (Coleoptera: Brentidae). There were no significant differences in the responsiveness to sex pheromones and spontaneous flight activity between wild and mass‐reared strains. These results indicate that mass‐reared strains of C. formicarius might not cause serious problems for implementing SIT programmes.

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Age‐dependent investment in death‐feigning behaviour in the sweetpotato weevil Cylas formicarius

Cited by 20 publications

References 44 publications

Laboratory adaptation reduces female mating resistance in the sweet potato weevil

Laboratory adaptation reduces female mating resistance in the sweet potato weevil

Contest behavior and other reproductive efforts in aging breeders: a test of residual reproductive value and state-dependent models

Mass‐rearing conditions do not affect responsiveness to sex pheromone and flight activity in sweetpotato weevils

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