Microdistribution of <i>Drunella trispina</i> (Uéno) (Ehemeroptera, Ephemerellidae) larvae in relation to fine substrate

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  • TAMURA Shigeaki
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • KAGAYA Takashi
    Graduate School of Agricultural and Life Sciences, The University of Tokyo

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  • ミツトゲマダラカゲロウ（<i>Drunella trispina</i> (Uéno)）（カゲロウ目，マダラカゲロウ科）幼虫の河床分布と細粒底質の関係
  • ミツトゲマダラカゲロウ(Drunella trispina (Ueno))(カゲロウ目,マダラカゲロウ科)幼虫の河床分布と細粒底質の関係
  • ミツトゲマダラカゲロウ(Drunella trispina (Ueno))(カゲロウモク,マダラカゲロウカ)ヨウチュウ ノ カショウ ブンプ ト サイリュウテイシツ ノ カンケイ

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Abstract

<p>　We evaluated the distribution of the late instar larvae of the stone-living mayfly Drunella trispina (Uéno) in fine substrate. In a mountain stream of the Tamagawa River system, the presence or absence of larvae was investigated on stones with different abundances of fine substrate under or around the stone. The occurrence probability of the larvae was high when the stone had a high proportion of fine substrate; larvae occurred only on stones with fine substrate covering > 75% of the area under the stone. Thus, fine substrate may be important for the microhabitat structure of macroinvertebrate species that inhabits stony riffles and does not directly utilize gravel or sand.</p>

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