コガタアカイエカの生態,とくに吸血と産卵を中心にして Observations on the Habits of Feeding and Oviposition of <i>Culex tritaeniorhynchus</i> GILES

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1966年,横浜市保土ケ谷区内の一豚豚舎でライト・トラップにより採集した野生コガタアカイエカを用い,吸血と産卵を中心にした生態観察ならびに実験を行なった。ただし実験の一部には当所で累代飼育中の406系を用いたが,両者を比較するのが主目的でなく,相補わせる形で実験を進めた。<br>1) 7∼9月の野外採集個体1卵舟あたり平均卵数は207.2で,マウス給血の対照406系172.3より多い。ふ化率には有意差なく,どちらも94%であった。<br>2) 吸血ごとの産卵を3回までくり返させた場合,各回の平均卵数は174.1, 148.9, 126.7で,約15%ずつ減少した。<br>3) 飼育室(27°C, RH 80%)での栄養生殖サイクルは最高4回まで認められ,この間の生存日数は羽化後約25日であった(406系)。<br>4) 406系の場合,雌成虫のマウス吸血活動は受精と無関係に行なわれ,吸血後も受精(交尾)がとくに促進されなかった。しかし,野外でトラップに捕集される雌成虫は経産・未経産または吸血・未吸血を問わず大部分が受精個体であった。<br>5) 1966年4∼10月の自然集団の平均経産率(%)は,4月が16.2, 5月が10.6で4∼5月は低く,6∼8月はそれぞれ31.0, 35.4, 32.9でやや高く,9月は57.7, 10月は92.8で9月から10月にかけ急上昇し,とくに10月の集団は老化の程度が著しい。また,採集時の吸血個体では6∼8月間の経産率に有意差なく,平均32.7%であった。これから推定すると,シーズン中宿主を吸血した蚊の約1/3がウイルス伝播の可能性を持っていた。<br>6) 経産個体の経産回数は3回まで認められた。そのうち1回だけのものがを95%占めていたが,考察の結果,実際には2回(または3回)産卵する個体もかなり多いと推定された。<br>7) 以上の成績を考察した結果,越冬に入る個体は9月以降に生産され,その大部分はもはや畜舎に飛来せず越冬場所へ移動するが,日本の暖地では9∼10月の活動蚊(吸血または吸血経産)の一部もまた越冬を完了し,翌春まで生き残ることが推測された。

Some ecological surveys and experiments on <i>Culex tritaeniorhynchus</i> GILES were carried out with 406 strain and wild-caught mosquitoes. The former strain has been established in the 406th Medical General Laboratory U.S. Army, Atsugi, Japan and the latter was collected with a light trap at a pigpen in the suburb of Yokohama. The average number of eggs per raft collected from July to September 1966 was 207.2 eggs, while 406 strain, when fed on mice, laid 172.3 eggs which was significantly less than the former. However, the hatching rates of egg batches of both groups were same, being 94% in fifty rafts counted. In a test using 406 strain mosquitoes, the number of eggs per raft decreased at the rate of about 15% in each gonotrophic cycle, namely 174.1, 148.9 and 126.7 eggs per raft for three successive cycles respectively. In the rearing cabinet (27°C, RH 80%), some of the females of 406 strain mosquitoes were able to repeat four gonotrophic cycles for about 25 days. The parous rates of the wild mosquitoes were checked from April to October in 1966. It was 16.2% in April and 10.6% in May and these were the lowest throughout the season. In June, July and August the parous individuals increased more than those in the previous two months and the rates were calculated as 31.0%, 35.4%, and 32.9%, respectively. From September to October, the wild female population became rapidly older as compared with the preceding months, being the parous rates 57.7% and 92.8% respectively. By age-grouping method, the parous mosquitoes from the field were found to have either one, two or three relics and among them uniparous females accounted for 94.9% of all parous ones. However, it is very probable that there were more biparous or triparous females, since many engorged individuals were usually found in the parous female populations. From these results, it was suggested that the hibernating adult females should be developed since early September and most of them did not fly to the host-sheds but migrated toward other hiding places to hibernate, although some of the female adults which engorged and laid egg-rafts during September and October would also possibly survive until the following spring, especially in the south of Japan.

収録刊行物

  • 応動昆

    応動昆 11(3), 83-89, 1967

    日本応用動物昆虫学会

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各種コード

  • NII論文ID(NAID)
    110001123416
  • NII書誌ID(NCID)
    AN00186121
  • 本文言語コード
    JPN
  • 資料種別
    雑誌論文
  • ISSN
    0021-4914
  • NDL 記事登録ID
    8357649
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物) // ZR7(科学技術--農林水産--農産)
  • NDL 請求記号
    Z18-41
  • データ提供元
    CJP引用  NDL  NII-ELS  J-STAGE 
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