Positive genetic covariance between male sexual ornamentation and fertilizing capacity

Polák, Michal; Hurtado-Gonzales, Jorge L.; Benoit, Joshua B.; Hooker, Kassie J.; Tyler, Frances

doi:10.1016/j.cub.2021.01.046

Cited by 10 publications

(6 citation statements)

References 66 publications

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“…The combined impact is that rapid hardening can promote male fitness in two ways: (1) by allowing high performance during pre-copulatory interactions, and (2) by allowing males to maximize fertility. Interactions between preand post-copulatory factors contribute to male fertility (Birkhead and Pizzari, 2002;Polak et al, 2021), which we show are both negatively impacted by exposure to stress.…”

Section: Reduced Egg Viabilitymentioning

confidence: 66%

Rapid stress hardening in the Antarctic midge improves male fertility by increasing courtship success and preventing decline of accessory gland proteins following cold exposure

Ajayi

Gantz

Finch

et al. 2021

Journal of Experimental Biology

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Rapid hardening is a process that quickly improves an animal's performance following exposure to a potentially damaging stress. In this study of the Antarctic midge, Belgica antarctica (Diptera, Chironomidae), we examine how rapid hardening in response to dehydration (RDH) or cold (RCH) improves male pre- and post-copulatory function when the insects are subsequently subjected to a damaging cold exposure. Neither RDH nor RCH improved survival in response to lethal cold stress, but male activity and mating success following sublethal cold exposure was enhanced. Egg viability decreased following direct exposure of the mating males to sublethal cold but improved following RCH and RDH. Sublethal cold exposure reduced expression of four accessory gland proteins, while expression remained high in males exposed to RCH. Though rapid hardening may be cryptic in males, this study shows that it can be revealed by pre- and post-copulatory interactions with females.

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Section: Reduced Egg Viabilitymentioning

confidence: 66%

Rapid stress hardening in the Antarctic midge improves male fertility by increasing courtship success and preventing decline of accessory gland proteins following cold exposure

Ajayi

Gantz

Finch

et al. 2021

Journal of Experimental Biology

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“…The likely functions of the claws that we can discern are at least twofold, both of which are mechanical in nature and likely to be generating inter-locus sexual conflict [6]. One is that the claws serve to assist the male in achieving copulation by facilitating the grasping of the female and opening or orienting her gonopore-ability to 'coerce' previously inseminated females to mate may be an especially important determinant of male post-copulatory fitness [31,32]. A second potential (non-mutually exclusive) function is that they serve to anchor the genitalia and maintain intimate connection during copulation, thus facilitating the eversion of the aedeagus through the female gonopore and ejaculate transfer.…”

Section: Discussionmentioning

confidence: 99%

Refutation of traumatic insemination in the Drosophila bipectinata species complex

Polák

McEvey

2022

Biol. Lett.

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Traumatic insemination (TI) is a rare reproductive behaviour characterized by the transfer of sperm to the female via puncture wounds inflicted across her body wall. Here, we challenge the claim made by Kamimura (Kamimura 2007 Biol. Lett. 3 , 401–404. ( doi:10.1098/rsbl.2007.0192 )) that males of species of the Drosophila bipectinata complex use a pair of claw-like processes (claws) to traumatically inseminate females: the claws are purported to puncture the female body wall and genital tract, and to inject sperm through the wounds into the lumen of her genital tract, bypassing the vaginal opening. This supposed case of TI is widely cited and featured in prominent subject reviews. We examined high-resolution scanning electron micrographs of the claws and failed to discover any obvious ‘groove’ for sperm transport. We demonstrated that sperm occurred in the female reproductive tract as a single-integrated unit, inconsistent with the claim that sperm are injected via paired processes. Laser ablation of the sharp terminal ends of the claws failed to inhibit insemination. We showed that the aedeagus in the complex delivers sperm through the vaginal opening, as in other Drosophila . The results refute the claim of TI in the Drosophila bipectinata species complex.

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“…Sota & Kubota, 1998). Postmating‐prezygotic isolation could be a by‐product of premating isolation via a genetic correlation between male sexual ornamentation and fertilizing capacity (Polak et al, 2021). However, male sexual traits targeted by female preference in premating stages may be absent in Ohomopterus because the male coercively mates with the female (Takami, 2002) even if the female is heterospecific (Okuzaki et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Reproductive isolation via divergent genital morphology due to cascade reinforcement inOhomopterusground beetles

Xia

Nishimura

Nagata

et al. 2022

J of Evolutionary Biology

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Positive genetic covariance between male sexual ornamentation and fertilizing capacity

Cited by 10 publications

References 66 publications

Rapid stress hardening in the Antarctic midge improves male fertility by increasing courtship success and preventing decline of accessory gland proteins following cold exposure

Rapid stress hardening in the Antarctic midge improves male fertility by increasing courtship success and preventing decline of accessory gland proteins following cold exposure

Refutation of traumatic insemination in the Drosophila bipectinata species complex

Reproductive isolation via divergent genital morphology due to cascade reinforcement inOhomopterusground beetles

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