コガタアカイエカの未吸血未経産雌の濾胞の退化

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種々の条件下で得られたコガタアカイエカの未吸血未経産雌について濾胞の退化の状況を調査した.9月上旬頃に屋外条件下で羽化した吸血活性雌を長期間吸血させずにおくと,大部分の第1濾胞は退化するが,9月中旬頃以降の短日長下で羽化した吸血不活性雌,いわゆる休眠雌では,長期間飼育しても第1濾胞は高頻度に退化することはない.秋及び初春に畜舎で採集した未吸血未経産雌には,多数の退化濾胞を持ったものはほとんどなかった.それ故,本種の吸血活性雌の濾胞の退化は実験条件下で普通に起るが,自然界では高率に起るとは思われない.With unfed nulliparous females of Culex tritaeniorhynchus, the most important vector of Japanese encephalitis, the follicular degeneration was examined under various conditions. Most of first follicles in an ovary were found to degenerate commonly in gonoactive females which emerged in early September and were kept at outdoors for a long period of about 3 months without being allowed to take blood meal. However, in gonoinactive, or diapausing, females having emerged after middle September when the day-length becomes shorter and the air temperature falls, degenerate follicles were low in rate, even when they were held for about 3 months or more without blood meal. Unfed nulliparous females with many degenerate follicles were scarcely found in autumn and early spring among those which were caught at animal sheds. Accordingly, it is considered that follicular degeneration in gonoactive females of the present species is commonly shown under experimental conditions, however, such a phenomenon rarely occurs in the field.
長崎大学熱帯医学研究所,Institute of Tropical Medicine, Nagasaki Universityの論文
1978-06-30

コガタアカイエカの未吸血未経産雌の濾胞の退化

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