Population fluctuations of light-attracted chrysomelid beetles in relation to supra-annual environmental changes in a bornean rainforest

K. Kishimoto-Yamada, T. Itioka, S. Sakai, K. Momose, T. Nagamitsu, H. Kaliang, P. Meleng, L. Chong, A. A. Hamid Karim, S. Yamane, M. Kato, C. A.M. Reid, T. Nakashizuka, T. Inoue

    研究成果: Article査読

    22 被引用数 (Scopus)

    抄録

    In Southeast Asian tropical rainforests, two events, severe droughts associated with the El Nio-Southern Oscillation and general flowering, a type of community-wide mass flowering, occur at irregular, supra-annual intervals. The relationship between these two supra-annual events and patterns of insect population fluctuations has yet to be clearly elucidated. Leaf beetles (Chrysomelidae) are major herbivores and flower-visitors of canopy trees, affecting their growth and reproduction and, in turn, affected by tree phenology; but their population fluctuations in the Southeast Asian tropics have not been extensively investigated. We examined population fluctuation patterns of the 34 most dominant chrysomelid species in relation to the two supra-annual events by conducting monthly light-trapping over seven years in a lowland dipterocarp forest in Borneo. Our results showed large community variation in population fluctuation patterns and a supra-annual (between-year) variation in abundance for most of the dominant chrysomelids that was significantly larger than the annual (within-year) variation. Specifically, in response to a severe drought in 1998, chrysomelid species exhibited different population responses. These results show that population fluctuations of individual species, rather than the entire assemblage, must be analyzed to determine the effects of changes in environmental conditions on the structure of insect assemblages in the tropics, especially in regions where supra-annual environmental changes are relatively more important than seasonal changes.

    本文言語English
    ページ(範囲)217-227
    ページ数11
    ジャーナルBulletin of Entomological Research
    99
    3
    DOI
    出版ステータスPublished - 2009 6月 1

    ASJC Scopus subject areas

    • 農業および作物学
    • 昆虫科学

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