Kazuma Matsumoto

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Lifetime mating success of males in a natural population of the papilionid butterfly,Atrophaneura alcinous, was investigated and causes of the variation were examined. The most successful males mated with 5 females, whereas about 73% of the males failed to mate. Body size of males was not correlated with their eclosion date, longevity and lifetime mating(More)
Mating frequency of both sexes in a natural population of the papilionid butterflyLuehdorfia japonica was studied with special attention to the role of sphragis in preventing multiple matings by females. Males patrolled continuously within a patchy habitat throughout the warm daylight period in search for females. Mating took place without specialized(More)
Females ofAtrophaneura alcinous usually mate soon after eclosion. Their ostium bursae becomes plugged with male secretion which reduces chances of remating. Males frequently cling to a copulating pair and wait for completion of copulation. This was observed in 66% of 198 copulating pairs, with a maximum of 5 males clinging at one time during the course of a(More)
The oligophagous ladybird beetle Henosepilachna yasutomii Katakura (Coleoptera: Coccinellidae) shows inter-population differences in its host-use. In this beetle, populations using the deciduous tree Pterostyrax hispida Sieb. et Zucc. (Styracaceae) were recently rediscovered in the Kanto districts of central Honshu, Japan. In the present study, the ability(More)
BACKGROUND Dental implants require regular maintenance. It is crucial that the instrument used for maintenance be able to remove plaque and calculus from the implant surface effectively and efficiently, while causing minimal damage to its circumference. Some ultrasonic scalers may be useful for implant maintenance; however, no clinical study has examined(More)
1. Population dynamics of a univoltine butterflyParnassius glacialis (Lepidoptera: Papilionidae) was studied with mark-recapture methods for three successive generations in a hilly region in Kanazawa City, Ishikawa Prefecture, Japan in 1981–1983. 2. Jolly (1965) andSeber's (1973) method was applied to the mark-recapture data to estimate population(More)
BACKGROUND Although autoimmunity in MRL/lpr mice occurs due to a defect in Fas-mediated cell death of T cells, the role of Fas-independent apoptosis in pathogenesis has rarely been investigated. We have recently reported that receptor activator of nuclear factor (NF)-κB ligand (RANKL)-activated dendritic cells (DCs) play a key role in the pathogenesis of(More)
The nematode family Aphelenchoididae is a highly divergent group that contains plant parasites, predators, fungal feeders, and insect parasites. It is taxonomically separated into 7 subfamilies. Although molecular phylogenetic relationships among 6 of the subfamilies have been clarified, the phylogenetic position of the subfamily Entaphelenchinae, which is(More)
Mean egg cluster size ofLuehdorfia puziloi yessoensis varied among habitats. The mean egg cluster size tended to be large when abundance of the larval food leaves expressed as the fresh weight of leaves per unit area at a given habitat was high. Since this variation was observed among closely located study plots (butterflies can easily move between study(More)
The relationship between fluctuating asymmetry (FA) and mating success was studied within males of the sphragis-baring butterfly Luehdorfia japonica, which were collected at various periods during their mating season. FA was measured on the forewing and hindwing radius lengths of male butterflies. Mating frequency of males was estimated by assessing the(More)