エゾシカの高密度化に対するマルハナバチ群集の応答  [in Japanese] Summary Response of bumblebee community to overabundant Hokkaido sika deer (<i>Cervus nippon yesoensis</i>)  [in Japanese]

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Author(s)

    • 赤羽 俊亮 AKABA Syunsuke
    • 酪農学園大学大学院野生動物保護管理学研究室 Laboratory of Wildlife Management, Graduate School of Dairy Science, Rakuno Gakuen University
    • 日野 貴文 HINO Takafumi
    • 酪農学園大学大学院野生動物保護管理学研究室 Laboratory of Wildlife Management, Graduate School of Dairy Science, Rakuno Gakuen University
    • 吉田 剛司 YOSHIDA Tsuyoshi
    • 酪農学園大学大学院野生動物保護管理学研究室 Laboratory of Wildlife Management, Graduate School of Dairy Science, Rakuno Gakuen University

Abstract

<p>エゾシカが高密度に生息する洞爺湖中島と生息密度の低い洞爺湖湖畔地域で,エゾシカの高密度化がマルハナバチ類に及ぼす影響について考察するため,マルハナバチ類の個体数,種数および種構成を両地域で比較した.中島と湖畔の各3ヶ所でマルハナバチ類の捕獲および林床の開花植物の調査を実施した.中島よりも湖畔で採集個体数は有意に多かったが,種数には違いが見られなかった.nMDSを用いて群集構成を比較したところ,両調査地域間に差異があった.両地域の優占種であるエゾオオマルハナバチの個体数は中島の方が少なく,さらに他種の個体数は中島では非常に少なかった.また中島では林床植物の開花フェノロジーに中断が見られた.これらの結果から,エゾシカの高密度化がもたらす植生改変が,開花フェノロジーの断絶を介してマルハナバチの個体数を減少させ,種構成を変化させる可能性が示唆された.</p>

<p>In this study, we assessed the influence of high-density populations of the Hokkaido subspecies of sika deer (<i>Cervus nippon yesoensis</i>) on the abundance, species richness, and species composition of bumblebee communities. We collected bumblebees and recorded number of flowering plants at three study plots in a high-deer density area (Nakajima Island, located inside Lake Toya, southwest Hokkaido) and in a nearby low-deer density area (forests surrounding Lake Toya). Although species richness did not differ between these areas, bumblebee abundance on Nakajima Island was significantly lower than that in lakeside forests. Species composition of bumblebee communities in the two areas was found to significantly differ using nMDS analysis ; the abundance of <i>Bombus hypocrita sapporoensis</i>, the dominant species in both areas, was lower on Nakajima Island, and the abundance of other bumblebee species was low as well. Furthermore, on Nakajima Island the number of flowering plants was low and floral phenology had a pattern of temporary interruption. These results suggest that high deer density influenced the bumblebee community through vegetation modification and temporary interruption of normal floral phenology.</p>

Journal

  • JOURNAL OF THE JAPANESE WILDLIFE RESEARCH SOCIETY

    JOURNAL OF THE JAPANESE WILDLIFE RESEARCH SOCIETY 41(0), 1-9, 2016

    THE JAPANESE WILDLIFE RESEARCH SOCIETY

Codes

  • NII Article ID (NAID)
    130007710109
  • NII NACSIS-CAT ID (NCID)
    AA12300583
  • Text Lang
    JPN
  • ISSN
    0916-8265
  • NDL Article ID
    027234301
  • NDL Call No.
    Z18-1679
  • Data Source
    NDL  J-STAGE 
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