The effects of male harassment on mating duration in the seed bug, <i>Togo hemipterus</i>

Himuro, Chihiro; Fujisaki, Kenji

doi:10.1111/j.1570-7458.2011.01199.x

Cited by 9 publications

(8 citation statements)

References 46 publications

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“…Similar conclusions were reached about competition between synthetic lures and wild females of the hemlock looper, Lambdina fiscellaria fiscellaria (Guenée) (Delisle et al, 1998). However, disruption of copulation can also occur due to the presence of too many males around a female hindering each others' efforts to reach her (Himuro & Fujisaki, 2012).…”

Section: Discussionsupporting

confidence: 57%

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Mate‐finding allee effect in spruce budworm population dynamics

Régnière

Delisle

Pureswaran

et al. 2012

Entomologia Exp Applicata

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Allee effects can cause populations to decline due to decreasing population growth rates with decreasing density and play a major role in population dynamics. Mate-finding failure, a common mechanism contributing to demographic Allee effects, is usually difficult to demonstrate because of the arduous nature of sampling individuals at very low densities. In a rising outbreak of the eastern spruce budworm, Choristoneura fumiferana (Clemens) (Lepidoptera: Tortricidae), we used caged and tethered virgin females in traps to measure mating success over population densities ranging from deep endemic to outbreak conditions. We found that mating success increased with increasing population density, and that at endemic population densities, females experienced difficulties attracting males and mating, demonstrating for the first time a mate-finding Allee effect in the spruce budworm. The relationship between population density and mating success is nonlinear. As population density increased, the proportion of mated females eventually reached a plateau and mating success was not 100% even at the highest moth densities, probably due to female reluctance to mate and perhaps interference competition by males for access to females. Both laboratory-reared and wild females were equally effective in synthesizing pheromone, attracting males, and mating. Our results strongly suggest that a mate-finding Allee effect is involved in maintaining low-density spruce budworm populations below an Allee threshold where they fail to grow. Factors such as changes in predation pressure and immigration could help populations overcome this Allee threshold.

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Section: Discussionsupporting

confidence: 57%

“…We did not observe 100% mating success even at the highest population densities. However, disruption of copulation can also occur due to the presence of too many males around a female hindering each others' efforts to reach her (Himuro & Fujisaki, 2012). only about 86% of our females were receptive ( Figure 5).…”

Section: Discussionmentioning

confidence: 97%

Mate‐finding allee effect in spruce budworm population dynamics

Régnière

Delisle

Pureswaran

et al. 2012

Entomologia Exp Applicata

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“…Mate quality and number of mates are the key factor affecting female reproductive success (Bleu et al, 2012;Himuro & Fujisaki, 2012). Our mating interference experiments suggested that mating interactions between E. grisescens and E. obliqua were frequency-dependent.…”

Section: Discussionmentioning

confidence: 82%

Asymmetrical reproductive interference between two sibling species of tea looper: Ectropis grisescens and Ectropis obliqua

Zhang

Yuan

Yin

et al. 2016

Bull. Entomol. Res.

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Ectropis grisescens Warren and Ectropis obliqua (Prout) are two morphologically similar sibling species with overlapping ranges. In this study, manipulative laboratory experiments were conducted to examine the possibility of reproductive interference in sympatric populations of E. grisescens and E. obliqua and the potential consequences of the mating interaction. Our results showed that the presence of males or females of different species could incur mating interference and significant reduction of F 1 offspring. The reduction was not significant relevant to the initial relative abundance of E. grisescens and E. obliqua. Detailed observations of mating opportunity showed that female mating frequencies of both species were not significantly affected by the absolute species density, but the mating success of E. obliqua females with conspecific males depended on species ratio. In addition, adding males to the other species resulted in lower number of offspring suggesting that the males' behaviour might be linked with mating interference. Males of both E. grisescens and E. obliqua could interfere the intraspecific mating of the other species, but the impact of the mating interference differed. These combined data indicated that asymmetric reproductive interference existed in E. grisescens and E. obliqua under laboratory conditions, and the offspring of the mixed species were significantly reduced. The long term outcome of this effect is yet to be determined since additional reproductive factors such as oviposition rate and progeny survival to adulthood may reduce the probability of demographic displacement of one species by the other in overlapping niches.

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“…In this sense, and considering that different modules perform distinct functions in copula (Genevcius and Schwertner 2017), we believe that sexual selection may have contrasting roles across modules. For example, male claspers are used as clasping devices and sometimes have been associated with a male's ability to prolong mating in the presence of other males (Moreno‐García and Cordero 2008; Himuro and Fujisaki 2012; Myers et al. 2016).…”

Section: Discussionmentioning

confidence: 99%

Copulatory function and development shape modular architecture of genitalia differently in males and females

et al. 2020

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Genitalia are multitasking structures whose development is mediated by numerous regulatory pathways. This multifactorial nature provides an avenue for multiple sources of selection. As a result, genitalia tend to evolve as modular systems comprising semi‐independent subsets of structures, yet the processes that give rise to those patterns are still poorly understood. Here, we ask what are the relative roles of development and function in shaping modular patterns of genitalia within populations and across species of stink‐bugs. We found that male genitalia are less integrated, more modular, and primarily shaped by functional demands. In contrast, females show higher integration, lower modularity, and a predominant role of developmental processes. Further, interactions among parts of each sex are more determinant to modularity than those between the sexes, and patterns of modularity are equivalent between and within species. Our results strongly indicate that genitalia have been subjected to sex‐specific selection, although male and female genitalia are homologous and functionally associated. Moreover, modular patterns are seemingly constant in the evolutionary history of stink‐bugs, suggesting a scenario of multivariate stabilizing selection within each sex. Our study demonstrates that interactions among genital parts of the same sex may be more fundamental to genital evolution than previously thought.

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The effects of male harassment on mating duration in the seed bug, Togo hemipterus

Cited by 9 publications

References 46 publications

Mate‐finding allee effect in spruce budworm population dynamics

Mate‐finding allee effect in spruce budworm population dynamics

Asymmetrical reproductive interference between two sibling species of tea looper: Ectropis grisescens and Ectropis obliqua

Copulatory function and development shape modular architecture of genitalia differently in males and females

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