Seasonal changes in oviposition activity, hatching and embryonation rates of eggs of Aedes albopictus (Diptera: Culicidae) on three islands of the Ryukyu Archipelago, Japan

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  • HIGA Yukiko
    Laboratory of Medical Zoology, School of Health Sciences, Faculty of Medicine, University of the Ryukyus:(Present Office)Center for International Collaborative Research, Nagasaki University : Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University
  • TOMA Takako
    Laboratory of Medical Zoology, School of Health Sciences, Faculty of Medicine, University of the Ryukyus : Center for Asia-Pacific Island Studies, University of the Ryukyus
  • ARAKI Yasutetsu
    Yaeyama Health Center of Okinawa Prefecture
  • ONODERA Itaru
    Yaeyama Health Center of Okinawa Prefecture
  • MIYAGI Ichiro
    Laboratory of Medical Zoology, School of Health Sciences, Faculty of Medicine, University of the Ryukyus

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  • 琉球列島の沖縄島,石垣島及び与那国島におけるヒトスジシマカの産卵消長,孵化及び胚形成率について

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Abstract

An ovi-trap collection was made weekly both indoors and outdoors on three islands of the Ryukyu Archipelago, Japan, from May 2002 to May 2003. The total number of mosquito eggs collected from each of the islands was 17,757 in Okinawa, 11,190 in Ishigaki and 28, 375 in Yonaguni. More than 99% of the pupae and adults emerging from the eggs were Aedes albopictus, while the rest were Ochlerotatus togoi. There were no Ae. aegypti eggs confirmed. Oviposition of Ae. albopictus was interrupted by heavy rains and typhoons but continued soon after weather recovery. No eggs were collected in January in Okinawa Is., but eggs were found even in winter in Ishigaki Is. and Yonaguni Is., although the number of eggs was small. Aedes albopictus oviposited more eggs in ovi-traps outdoors than indoors. The low hatching rates of Ae. albopictus eggs during winter in Okinawa Is. in spite of high embryonation rates suggest light dormant eggs. The egg biology of Ae. albopictus in the subtropical region is discussed.

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