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Studies on Gonoactivity and Overwintering of the Mosquito, Anopheles sinensis Wiedermann in Nagasaki Area


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Title: Studies on Gonoactivity and Overwintering of the Mosquito, Anopheles sinensis Wiedermann in Nagasaki Area
Other Titles: シナハマダラカの生殖活性と越冬に関する研究
Authors: Oda, Tsutomu / Kurokawa, Kenji / Mori, Akio / Ueda, Masakatsu / Zaitsu, Makoto / Suenaga, Osamu / Uchida, Keikichi
Authors (alternative): 小田, 力 / 黒川, 憲次 / 上田, 正勝 / 森, 章夫 / 在津, 誠 / 末永, 斂 / 内田, 桂吉
Issue Date: 31-Mar-1989
Citation: 長崎大学医療技術短期大学部紀要 = Bulletin of the School of Allied Medical Sciences, Nagasaki University. 1989, 2, p.25-35
Abstract: 種々の条件下でシナハマダラカの濾胞の発育状態と生殖活性の変化を検討して本種の越冬様式を明らかにした。長崎地方では大型濾胞の吸血活動雌が9月中旬頃まで羽化するが,9月下旬以降には小型濾胞の吸血しない休眠雌が羽化する。吸血活性雌は吸血と産卵を繰り返し冬期までに死亡するであろう。栄養生殖分離は吸血にくる雌の個体数が極めて少ない秋に低率におこる。したがってその絶対数は極めて少なく,本現象はこの蚊の越冬生態にとって重要ではない。それ故,9月下旬以降に羽化する休眠雌が一般に越冬し,1月に濾胞が発育し休眠状態から覚醒し吸血活動を開始する。休眠雌の出現は秋の短日により誘起される。本種の越冬様式はアカイエカやコガタアカイエカのそれと基本的には同じであるといえる。 / In the Nagasaki area, the females of Anopheles sinensis, emerging before late September are gonoactive with well-developed follicles while the females emerging later are generally in the diapausing state without feeding on animal blood and with less-developed follicles. Gonoactive females will continue feeding activity and oviposition and die off in winter. In nature, few females show gonotrophic dissociation. Therefore, this phenomena does not seem to play an important role irr overwintering ecology of this mosquito. Thus,the overwintering population is mostly composed of diapausing females. In January the diapausing females will begin to reactivate from the state of diapause and feed on animal blood with the increase in size of follicles. The diapausing females are considered to be induced by short daylengths in autumn. The overwintering pattern of this mosquito species is considered to be similar to that in Culex pipiens pallens and Culex tritaeniorhynchus.
Keywords: Anopheles sinensis / imaginal diapause / overwintering / gonoactivity / follicle
URI: http://hdl.handle.net/10069/18085
ISSN: 09160841
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 2

Citable URI : http://hdl.handle.net/10069/18085

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