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- 저자 : Takahisa Miyatake (검색결과 3 건)
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Miyatake Takahisa,Suge Taichi,Suzaki Shunsuke,Tanabe Shintaro,Ishihara Ryo,Matsumura Kentarou 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
Swarming and mating behaviors of a mayfly species, Ephemera orientalis Mclachlan, 1875 were observed in 2015, 2016, and 2018 at a river bank of the Asahi River, Japan. Males started to make swarms between late April and middle May in 2016 and 2018. The numbers of mated pairs in a swarm correlated with the numbers of flying males in a swarm in 2016 and 2018. Swarms were formed during a limited period at dusk most probably because that interval is free from natural enemies. Males competed with each other to copulate with females in swarms. We clarified the function of the forelegs of males, which are significantly longer than those of females. Males used their forelegs to hold up a female from below. Besides forelegs, males have longer tails than females. We will discuss why sexual differences are found in these traits. Our results represent the first observation of swarm mating behavior in E. orientalis.
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Takuto Sumi,Yui Takahashia,Hiroki Sawatani,Shigenori Karasawa,Kazuki Miura,Takahisa Miyatake 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
Wolbachia are ubiquitous endosymbionts that infect many invertebrates and often manipulate their hosts' reproduction. Although a bias in the sex ratio of the host species due to infection with Wolbachia has been reported in the field, few studies have investigated the seasonal change in rates of infection by Wolbachia. Examining seasonal changes in Wolbachia infection is important because many parasitic infection agents, such as bacteria or viruses, usually show seasonal dynamics. In the present study, we examined the seasonal abundance and sex ratio of two closely related pill bug species that sympatrically inhabit Okayama, Japan. Phylogenetic and morphological analyses identified the two closely related species as Spherillo sp. sensu Karasawa et al. 2014 and Spherillo sp. shi-1 sensu Karasawa and Kawano 2014; they cohabit in fallen leaves, i.e., litter, on a mountain in Okayama City. An obvious peak in emergence of the two pill bug species was not observed. Both sympatric species were infected by Wolbachia, but no seasonal trends were found in the infection rate of Wolbachia. In Spherillo sp., females had higher infection rates than males, while the rates were almost 100% in both sexes in Spherillo sp. shi-1. The results suggest that the two pill bug species are infected by different Wolbachia strains with dissimilar manipulations of the sex ratio.
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Longevity of Lucilia sericata (Meigen, 1826) used as pollinator
Shimomae Koichi,Sato Takuya,Yoshida Yuichi,Naing Shine Shane,Miyatake Takahisa 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.4
Pollinators play an important role in the production of many agricultural products. Honeybees, Apis mellifera L., are leading pollinators, but the number of honeybees in the world is declining. Finding alternatives is beginning to be important. In the present study, we compared the longevity of Lucilia sericata (Meigen, 1826), which is used as a pollinator, in cages in the laboratory and in a vinyl greenhouse under controlled feeding conditions. First, we showed that the longevity of the flies was significantly extended (c.a. 40 days) in the laboratory when water and sugar were supplied compared to the cases without sugar and/or water. Second, we found that the average longevity was 20 days with water and sugar in cages kept in a vinyl greenhouse during the summer. Finally, we released marked flies into a vinyl greenhouse where strawberries were cultivated without feeding water or sugar in the spring. As a result, fewer than 10% of the flies survived 10 days after release. Based on the result, we discuss the use of this species as a pollinator in the context of its survival rate.
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