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Factors influencing development and survival ofCulex pipiens pallens larvae (Diptera: Culicidae) in polluted urban creeks

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Researches on Population Ecology

Summary

Factors influencing development and survival ofCulex pipiens pallens immatures in polluted urban creeks were studied in Saga, Japan. Addition of food shortened developmental durations and increased pupal size in floating cages at only the least polluted site out of 4 study sites. There was no evidence for developmental delay due to overcrowding in natural populations. Survival was not increased by artificial feeding at any site. Using the developmental parameters obtained for caged cohorts, survival in natural populations was estimated from differences between the actual number and the expectation if there were no mortality. Pupation rates ranged from 1> to >10% by site and season. Mortality due to predation, evaluated from the difference in pupation rates between caged and natural populations, exceeded 30% in 4 out of 6 cases (twice at 2 sites and once at the other 2 sites). Lethal factors in the creek water caused the predominant mortality in 2 other cases. Regulation ofC. pipiens pallens population breeding in eutrophic, open creeks was discussed in the context of larval dispersal through behavioral interference.

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Authors and Affiliations

  1. Division of Parasitology, Department of Microbiology, Saga Medical School, Nabeshima, 849, Saga, Japan

    M. Mogi & T. Okazawa

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  1. M. Mogi
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  2. T. Okazawa
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Mogi, M., Okazawa, T. Factors influencing development and survival ofCulex pipiens pallens larvae (Diptera: Culicidae) in polluted urban creeks. Res Popul Ecol 32, 135–149 (1990). https://doi.org/10.1007/BF02512595

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  • DOI: https://doi.org/10.1007/BF02512595

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