Regulation of Sperm Quantity Transferring to Females at Mating in the Adult Male of Polygonia c-aureum (Lepidoptera: Nymphalidae)

Hiroyoshi, Satoshi

doi:10.1303/aez.30.111

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…It is likely that older males have more sperm available for ejaculation due to daily sperm release from the testes, as is the case in other Lepidoptera (Giebultowicz et al . 1989; Hiroyoshi, 1995; Wedell & Cook, 1999). Taken together, these results suggest that performance in sperm competition depends, in part, on the number of sperm transferred.…”

Section: Discussionmentioning

confidence: 99%

Determinants of sperm precedence in a noctuid mothHeliothis virescens: a role for male age

LaMunyon¹

2001

Ecological Entomology

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Summary 1. Females of the noctuid moth Heliothis virescens F. mate more than once. Thus, sperm from two or more males normally compete for fertilisations within the female reproductive tract. The eggs are typically fertilised by sperm from only one male, either the female's last mate or an earlier mate. Twice‐mated females store only one ejaculate's worth of fertilising sperm (eupyrene) but nearly two ejaculates' worth of a nonfertilising sperm morph (apyrene), which is thought to play a role in sperm competition. 2. The mechanism of sperm use in H. virescens was investigated by examining factors that vary with paternity, which was assigned based on allozyme variation. The factors included male and female body masses and ages, male genital characters, the size of the sperm package, and the number of sperm stored by the female. 3. One male typically gained sperm precedence; this was nearly twice as likely to be the second male as it was to be the first. Two factors were found to vary significantly with paternity: female mass and male age. The second male to mate was more likely to gain sperm precedence if the female was larger and if the male was older than the female's first mate. 4. The significance of male age and female mass to several hypothetical models of the mechanism of sperm use is discussed.

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Section: Discussionmentioning

confidence: 99%

Determinants of sperm precedence in a noctuid mothHeliothis virescens: a role for male age

LaMunyon¹

2001

Ecological Entomology

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“…This means that males are not dependent on the number of sperm released from the testis on the day of copulation (Giebultowicz & Zdarek 1996). Males of some species have been shown not to ejaculate all the sperm they have present in the duplex in a single mating (Proshold & Bernon 1994; Hiroyoshi 1995), suggesting that males can decide how many sperm to ejaculate at a given mating. Thus, the ability of males to store sperm in the duplex provides a mechanism for strategic allocation of sperm between matings.…”

Section: Discussionmentioning

confidence: 99%

Strategic sperm allocation in the Small White butterfly Pieris rapae (Lepidoptera: Pieridae)

Wedell

Cook

1999

Functional Ecology

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Summary 1.In species where females mate multiply, it is important for males to recuperate quickly in order to maximize their fertilization success. Butterflies produce a spermatophore at mating containing accessory secretions and sperm of two types: a large number of nonfertile 'apyrene' sperm and fewer fertile 'eupyrene' sperm. Many butterfly species eclose with most nutrients for reproduction already present. Males must therefore decide how to allocate resources to the various spermatophore components at any given mating. 2. Recovery rates of apyrene and eupyrene sperm number and spermatophore size was studied in the polyandrous Small White butterfly Pieris rapae. The mass of the first spermatophore increases with time since eclosion, as does the number of both types of sperm. Similarly, on a male's second mating, both the mass of the spermatophore and the number of sperm increases with time since the first mating. 3. However, the rate of increase in eupyrene sperm numbers is higher after the first mating. The difference in rate of increase may be the result of different probabilities of virgin and non-virgin males obtaining future matings. 4. Males have a sperm storage organ, the duplex, in which they retain sperm after their first mating. This ensures that high sperm numbers are available for their second mating, even when remating only 1 h later. Thus, males do not ejaculate all available sperm on any given mating, and seem to have different strategies on their first and second matings. 5. It can be argued that Small White butterfly males allocate sperm strategically according to the probability of obtaining subsequent matings, and the level of sperm competition.

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“…As the testes are right next to the seminal vesicle, the testes can supply sperm into the seminal vesicle immediately, suggesting that the positional relationship between the testes and the seminal vesicle is very important in this weevil. Although the research on spermatogenesis and morphology of male reproductive organs has been proceeding in the last two decades [12,13,14,15,16], in the present study, it has been highlighted on the positional relationship and its function between the testes and the seminal vesicle for the first time, and many unknown phenomenon, like sperm reflux [17], remains to be found on male reproduction.…”

Section: Discussionmentioning

confidence: 83%

Sperm Supply from the Testes to the Seminal Vesicle over Consecutive Matings in the Sweetpotato Weevil, <i>Cylas formicarius</i> (F<sub>ABRICIUS</sub>) (Coleoptera: Curculionidae)

Hiroyoshi¹,

Reddy²,

Kohama³

2017

AJLS

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Abstract:The sweetpotato weevil, Cylas formicarius, stores free sperm in both the testes and the seminal vesicle, even though the primary function of the testes is sperm production. Here, it was investigated sperm storage in the testes in relation to mating frequency. In particular, it was examined the effect of the positional relationship between the testes and seminal vesicle, on sperm storage by counting the number of sperm in those organs. After mating, not only were the number of free sperm in the seminal vesicle reduced, but also was the number in the testes, suggesting that free sperm stored in the testes moved into the seminal vesicle during or immediately after mating. Since this weevil seems to not regulate the number of sperm in the seminal vesicle for ejaculation, the sperm supply system of the testes may contribute ejaculate to support consecutive, multiple matings by this weevil.

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Regulation of Sperm Quantity Transferring to Females at Mating in the Adult Male of Polygonia c-aureum (Lepidoptera: Nymphalidae)

Cited by 12 publications

References 16 publications

Determinants of sperm precedence in a noctuid mothHeliothis virescens: a role for male age

Determinants of sperm precedence in a noctuid mothHeliothis virescens: a role for male age

Strategic sperm allocation in the Small White butterfly Pieris rapae (Lepidoptera: Pieridae)

Sperm Supply from the Testes to the Seminal Vesicle over Consecutive Matings in the Sweetpotato Weevil, <i>Cylas formicarius</i> (F<sub>ABRICIUS</sub>) (Coleoptera: Curculionidae)

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Regulation of Sperm Quantity Transferring to Females at Mating in the Adult Male of Polygonia c-aureum (Lepidoptera: Nymphalidae)

Cited by 12 publications

References 16 publications

Determinants of sperm precedence in a noctuid mothHeliothis virescens: a role for male age

Determinants of sperm precedence in a noctuid mothHeliothis virescens: a role for male age

Strategic sperm allocation in the Small White butterfly Pieris rapae (Lepidoptera: Pieridae)

Sperm Supply from the Testes to the Seminal Vesicle over Consecutive Matings in the Sweetpotato Weevil, &lt;i&gt;Cylas formicarius&lt;/i&gt; (F&lt;sub&gt;ABRICIUS&lt;/sub&gt;) (Coleoptera: Curculionidae)

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Sperm Supply from the Testes to the Seminal Vesicle over Consecutive Matings in the Sweetpotato Weevil, <i>Cylas formicarius</i> (F<sub>ABRICIUS</sub>) (Coleoptera: Curculionidae)