Synchronization of reproductive period among the two male forms and female of the damselfly <i>Mnais pruinosa</i> selys (Zygoptera: Calopterygidae)

Nomakuchi, Shintaro; Higashi, Kazunori; Maeda, Makoto

doi:10.1007/bf02346931

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…In M. costalis, the loss of polymorphism occurs through the disappearance of clear-winged males, while in M. pruinosa the loss of polymorphism occurs through the disappearance of orange-winged males. As the orange-winged morph is larger than the clear-winged male in polymorphic populations of both species (Nomakuchi et al, 1988;Tsubaki et al, 1997), the loss of polymorphism may simply result in divergence in body size. So, the mean body size of monomorphic M. costalis populations is expected to be larger than that of polymorphic populations.…”

Section: Discussionmentioning

confidence: 98%

“…Orange-winged males show territorial behaviors, defending dead semi-submerged logs or emergent plants into which females oviposit, and copulate with females on territories. Clear-winged males usually perch nearby orange-winged males' territorial sites, trying to intercept approaching females for copulation and oviposition (for M. costalis; Hayashi et al, 2004;Tsubaki, Hooper, & Siva-Jothy, 1997;for M. pruinosa;Nomakuchi, 1992;Nomakuchi, Higashi, & Maeda, 1988).…”

Section: Introductionmentioning

confidence: 98%

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Smaller damselflies have better flight performance at lower body temperature: implications for microhabitat segregation of sympatricMnaisdamselflies

Okuyama

Samejima

Tsubaki

2015

International Journal of Odonatology

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In many cases where two closely related species coexist, ecological interaction or reproductive interference drive species to diversify in their body size and/or other signal traits, often concurrently with microhabitat segregation. However, it is usually unclear how character diversification is associated with microhabitat segregation. We performed laboratory experiments using males of two damselfly species (Mnais costalis and Mnais pruinosa) collected from a syntopic site in Shiga Prefecture, Japan. We analyzed the effects of body temperature and body size on three indices of flight performance: wing-beat frequency and flight speed as measures of thrust production, and minimum body temperature for flight (MBTF). The results showed that the MBTF was correlated with body size: the smaller species (M. pruinosa) flew better than the larger species (M. costalis) in a cool environment. The initial flight speed was positively correlated with body temperature, but negatively correlated with body size. The wing-beat frequency was also positively correlated with body temperature, but negatively correlated with body size. The combined effects of body size and body temperature on wing-beat frequency meant that overall, there was no significant difference in initial flight speed. We suggest that the effect that body size and temperature have on flight performance explains the previously documented microhabitat segregation occurring between these two species, with the larger M. costalis preferring sunny environments and M. pruinosa preferring shady environments.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Smaller damselflies have better flight performance at lower body temperature: implications for microhabitat segregation of sympatricMnaisdamselflies

Okuyama

Samejima

Tsubaki

2015

International Journal of Odonatology

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“…Mnais pruinosa exhibits a synchronous emergence pattern [9] , [10] . Younger individuals are abundant during the early adult flying period, but spent individuals increase during the late period.…”

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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Male reproductive polymorphism and form‐specific habitat utilization of the damselfly Mnais pruinosa (Zygoptera: Calopterygidae)

Nomakuchi

1992

Ecological Research

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Habitat utilization patterns were studied in damselfly males, Mnaispruinosa, which have two male forms with different reproductive behaviors. The 'esakii' (orange-winged males) were territorial around oviposition sites, while the 'strigata' (hyaline-winged males) were non-territorial, often sneaking into the esakii's territory or loitering on the foliage of vegetation along stream banks. The place in the stream in the study area where females frequently appeared was covered by reeds and had abundant oviposition sites. It was difficult for the territorial esakii to stay there because the crowded reeds prevented them from defending their territory and discovering the females. Furthermore, there was competition for the limited territorial space with another species, Mnais nawai. Strigata males concentrated in this place in direct proportion to the number of females. Females frequently mated with strigata males and probably deposited eggs fertilized by strigata sperm rather than esakii sperm. The density of strigata was higher than that of esakii in this study area. If the average reproductive success of esakii and strigata males is equal, this may indicate that the equilibrious point between the two male forms is biased toward strigata.

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Synchronization of reproductive period among the two male forms and female of the damselfly Mnais pruinosa selys (Zygoptera: Calopterygidae)

Cited by 9 publications

References 16 publications

Smaller damselflies have better flight performance at lower body temperature: implications for microhabitat segregation of sympatricMnaisdamselflies

Smaller damselflies have better flight performance at lower body temperature: implications for microhabitat segregation of sympatricMnaisdamselflies

Factors Affecting Sperm Quality Before and After Mating of Calopterygid Damselflies

Male reproductive polymorphism and form‐specific habitat utilization of the damselfly Mnais pruinosa (Zygoptera: Calopterygidae)

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