Different responses to larval crowding between 2 strains of Aedes albopictus (Diptera : Culicidae) from Japan and Thailand

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  • TSUDA Yoshio
    Department of Medical Entomology, Institute of Tropical Medicine, Nagasaki University
  • SUZUKI Akemi
    Department of Medical Entomology, Institute of Tropical Medicine, Nagasaki University:(Present address)Instituto Adolfo Lutz
  • TAKAGI Masahiro
    Department of Medical Entomology, Institute of Tropical Medicine, Nagasaki University
  • WADA Yoshito
    Department of Medical Entomology, Institute of Tropical Medicine, Nagasaki University

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  • 2 系統のヒトスジシマカ(日本及びタイ国産)で観察された幼虫密度に対する反応の違いについて
  • Different responses to larval crowding

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Responses of larval populations to crowding were compared between 2 strains of Aedes albopictus from Nagasaki (NG), Japan and Chiangmai (CM), Thailand. Newly hatched larvae were reared with 6 different initial densities from 8 to 256 larvae/vial. The daily survival rate of old larvae and the number of produced pupae/vial differed between the 2 strains in high density-cohorts, while in low density-cohorts both strains showed similar responses to larval crowding. The differences in developmental time from hatch to pupation and in size of pupae were not significant between the strains, although the increased density resulted in delayed development of larvae and smaller pupae in both strains. The analysis of density-dependence of larval mortality showed different sensitivity to larval crowding between the 2 strains; the CM strain was more sensitive than the NG strain. Based on these results, the differences in growth pattern of laboratory populations between the 2 strains were discussed.

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