Surgical examination of male genital function of calopterygid damselflies (Odonata)

Tsuchiya, Kaori; Hayashi, Fumio

doi:10.1007/s00265-008-0571-y

Cited by 13 publications

(14 citation statements)

References 21 publications

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“…Waage 1979aWaage ,b, 1986. Males can be categorized into three groups based on their sperm removal tactics: (i) males that gain physical access to the spermathecae, (ii) males that cannot physically remove sperm from the spermathecae, presumably because the spermathecal lumen is too narrow to allow the entry of the male genitalia and (iii) males that elicit sperm ejection from the spermathecae via female sensory stimulation (Waage 1979a(Waage ,b, 2004Siva-Jothy and Hooper 1995;Cordero and Andr es 2002;Cordero Rivera et al 2004;Tsuchiya and Hayashi 2008). Remarkable variation in sperm removal mechanisms has been described, even among closely related species (i.e.…”

Section: Evidence For Nonadaptive Diversification In Reproductionmentioning

confidence: 99%

Non-adaptive radiation in damselflies

Wellenreuther¹

2016

2016 International Congress of Entomology

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Adaptive radiations have long served as living libraries to study the build-up of species richness; however, they do not provide good models for radiations that exhibit negligible adaptive disparity. Here, we review work on damselflies to argue that nonadaptive mechanisms were predominant in the radiation of this group and have driven species divergence through sexual selection arising from male-female mating interactions. Three damselfly genera (Calopteryx, Enallagma and Ischnura) are highlighted and the extent of (i) adaptive ecological divergence in niche use and (ii) nonadaptive differentiation in characters associated with reproduction (e.g. sexual morphology and behaviours) was evaluated. We demonstrate that species diversification in the genus Calopteryx is caused by nonadaptive divergence in coloration and behaviour affecting premating isolation, and structural differentiation in reproductive morphology affecting postmating isolation. Similarly, the vast majority of diversification events in the sister genera Enallagma and Ischnura are entirely driven by differentiation in genital structures used in species recognition. The finding that closely related species can show negligible ecological differences yet are completely reproductively isolated suggests that the evolution of reproductive isolation can be uncoupled from niche-based divergent natural selection, challenging traditional niche models of species coexistence.

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Section: Evidence For Nonadaptive Diversification In Reproductionmentioning

confidence: 99%

Non-adaptive radiation in damselflies

Wellenreuther¹

2016

2016 International Congress of Entomology

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“…However, these structures apparently do not have access to the spermatheca, since the sperm volume in this organ was similar for one-copulation females and for those interrupted at the end of stage I. This limited ability to remove spermathecal sperm has been previously found in some other odonates, such as the coenagrionids Ischnura elegans (Miller, 1987), and Ceriagrion tenellum (Andrés & Cordero-Rivera, 2000), and the calopterygids Mnais pruinosa (Siva-Jothy & Tsubaki, 1989;Tsuchiya & Hayashi, 2008) where females regain this control by impeding males from removing sperm from these organs (Córdoba-Aguilar & Cordero-Rivera, 2008). In this context, it is interesting to note that males of Calopteryx haemorrhoidalis asturica from Pontevedra, north-western Spain do not have access to the spermathecae, but the ejection of the rival sperm is induced by stimulation of the vaginal sensilla (Córdoba-Aguilar, 1999).…”

Section: Discussionmentioning

confidence: 87%

Limited spermathecal sperm removal ability in the damselflyHypolestes trinitatis(Gundlach) (Odonata: Megapodagrionidae)

Torres-Cambas

Cordero‐Rivera

2011

International Journal of Odonatology

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It has been hypothesized that sperm removal ability in male Odonata (damselflies and dragonflies) has promoted sexual conflict over the sperm stored in the reproductive tract of the female. Although there is evidence supporting this hypothesis, most studies have been conducted in a small number of species from specific families. We explored sperm removal ability in the Antillean Megapodagrionidae, Hypolestes trinitatis through examination of specialized structures on the genital ligula ("penis") and through measurement of sperm volumes stored in the sperm storage organs (bursa copulatrix and spermathecae) at different stages of the copula. Males removed sperm from the bursa, but not from the spermathecae. The penis has four finger-like terminal processes covered by spines which could contribute to sperm removal. Given the width of the penile processes, males could introduce them into the spermathecae to remove sperm; however this does not seem to occur. A possible explanation for the sperm removal pattern of H. trinitatis could be that the penile processes are prevented to reach the sperm stored due to their position in relation to the spermathecae during the copulation.

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“…However, it has been suggested that all sperm in the SPV are transferred to the female during the final stage of natural copulation [21]. Furthermore, the total duration of copulation is only 91 s in M. pruinosa and 254 s in C. cornelia [19]. Thus, the SPV is only used for short-term storage of sperm.…”

Section: Discussionmentioning

confidence: 99%

“…In M. pruinosa , the volume of sperm removed by males increases with the duration of copulation [27], such that removal is not complete for shorter copulations. In C. cornelia , BC sperm are usually removed completely, but SP sperm often remain [19]. Because sperm in the BC and SP are mixed [27], dilution occurs between newly received sperm and aged sperm already stored in the female, resulting in lower viability of the sperm within the female than in sperm transferred by males.…”

Section: Discussionmentioning

confidence: 99%

Factors Affecting Sperm Quality Before and After Mating of Calopterygid Damselflies

Tsuchiya

Hayashi

2010

PLoS ONE

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Damselflies (Odonata: Zygoptera) have a more complex sperm transfer system than other internally ejaculating insects. Males translocate sperm from the internal reproductive organs to the specific sperm vesicles, a small cavity on the body surface, and then transfer them into the female. To examine how the additional steps of sperm transfer contribute to decreases in sperm quality, we assessed sperm viability (the proportion of live sperm) at each stage of mating and after different storage times in male and female reproductive organs in two damselfly species, Mnais pruinosa and Calopteryx cornelia. Viability of stored sperm in females was lower than that of male stores even just after copulation. Male sperm vesicles were not equipped to maintain sperm quality for longer periods than the internal reproductive organs. However, the sperm vesicles were only used for short-term storage; therefore, this process appeared unlikely to reduce sperm viability when transferred to the female. Males remove rival sperm prior to transfer of their own ejaculate using a peculiar-shaped aedeagus, but sperm removal by males is not always complete. Thus, dilution occurs between newly received sperm and aged sperm already stored in the female, causing lower viability of sperm inside the female than that of sperm transferred by males. If females do not remate, sperm viability gradually decreases with the duration of storage. Frequent mating of females may therefore contribute to the maintenance of high sperm quality.

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Surgical examination of male genital function of calopterygid damselflies (Odonata)

Cited by 13 publications

References 21 publications

Non-adaptive radiation in damselflies

Non-adaptive radiation in damselflies

Limited spermathecal sperm removal ability in the damselflyHypolestes trinitatis(Gundlach) (Odonata: Megapodagrionidae)

Factors Affecting Sperm Quality Before and After Mating of Calopterygid Damselflies

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