Effect of invasive raccoons and civets on the population density of native raccoon dogs

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  • Kuriyama Takeo
    Institute of Natural and Environmental Sciences, University of Hyogo Wildlife Management Research Center, Hyogo
  • Koido Mika
    Graduate School of Agriculture and Life Science, The University of Tokyo
  • Osada Yutaka
    RIHN Center, Research Institute for Humanity and Nature
  • Asada Masahiko
    ASADA Wildlife Management Company (AMAC, LLC)
  • Yokomizo Hiroyuki
    Center for Health and Environmental Risk Research, National Institute for Environmental Studies
  • Miyashita Tadashi
    Graduate School of Agriculture and Life Science, The University of Tokyo

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Other Title
  • 密度推定に基づいたタヌキに対する外来哺乳類（アライグマ・ハクビシン）の影響
  • ミツド スイテイ ニ モトズイタ タヌキ ニ タイスル ガイライホニュウルイ(アライグマ ・ ハクビシン)ノ エイキョウ

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Abstract

One of the potential negative impacts of invasive species is competitive exclusion of native species that have similar or identical ecological niches. Even with extensive knowledge of the similarities between the diets and habitats of invasive and native species, it is difficult to predict the long-term consequences of species interactions over varying spatial and temporal scales with variable resource levels. Here we apply a hierarchical Bayesian model to examine the roles of spatial variations in land use and population densities of the introduced raccoon Procyon lotor and civet Paguma larvata on the population density of the native raccoon dog Nyctereutes procyonoides in the south-eastern Boso Peninsula, central Japan. Our analysis reveals that introduced raccoons negatively affect raccoon dog populations. Substantial numbers of native raccoon dogs and the two invasive mammals have been removed by trapping to control damage to crops. Despite these control measures, the invasive raccoon population has increased, which will likely lead to a reduction in the native raccoon dog population. It is thus imperative to monitor the population trends of native raccoon dogs to conserve this species.

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