Use of the truck trap for the survey of mosquito population and the physiological age composition

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  • Shimizu Yasuyoshi
    Dept. Virology & Rickettsiology, National Institute of Health:(Present address)Applied Science Division, Nomura Research Institute
  • Takahashi Mitsuo
    Dept. Medical Entomology, National Institute of Health
  • Yabe Sadao
    Dept. Virology & Rickettsiology, National Institute of Health

Bibliographic Information

Other Title
  • 野外蚊の個体数および生理的年齢構成の変動調査のためのトラックトラップの利用
  • ヤガイ カ ノ コタイスウ オヨビ セイリテキ ネンレイ コウセイ ノ ヘンドウ チョウサ ノ タメ ノ トラックトラップ ノ リヨウ

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Description

Truck trap collections were made to analyze the mosquito populations in a rural area of Gunma Prefecture during the period from the beginning of May to the beginning of October 1965. The trap was a similar type to that reported by Bidlingmayer (1966) and mounted on the roof of a small vehicle. It had a 110×80cm frontal opening, 175cm length and a 15×15cm rear opening where a nylon net was fixed to collect insect specimens. Operations were made for about 3 hours after sunset along the paths through villages and rice fields on 2 successive evenings in every week. The vehicle was driven at a velocity of 25-30 km/h. Eight species of mosquitoes were collected through the survey and the seasonal abundance of the 4 major species (Aedes vexans, Anopheles sinensis, Culex pipiens and Culex tritaeniorhynchus) were compared as shown in Fig.2. The transitions of physiological age of female mosquitoes were also studied for the 4 species dividing into 3 categories ; empty parous, blooded or gravid, and empty nulliparous. The parity of the mosquitoes were not markedly advanced at the latter part of the survey for all species, but the 3-4 week cyclic fluctuations seemed to be recognized for first 2 months in Aedes vexans and Anopheles sinensis. Culex pipiens had a relatively higher constitution of the blooded-gravid group than that in other species throughout the survey period due to chiefly the predominance of gravid specimens. Anopheles sinensis had, on the contrary, larger number of specimens with sackshaped dilatation at the pedicel of ovarioles among the empty parous group which indicate the immediateness after the oviposition. These findings may give some clew to our knowledge on the flight activity of the mosquitoes in regard to the oviposition behavior.

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