Effects of Re-inundation Afer Surface-exposure by Water Level Fluctuations on Odonate Larvae at a Littoral Zone in an Irrigation Pond

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  • ため池の水位変動に伴う露呈後の再冠水がトンボ目幼虫の生息に及ぼす影響
  • タメイケ ノ スイイ ヘンドウ ニ トモナウ ロテイ ゴ ノ サイカンスイ ガ トンボモク ヨウチュウ ノ セイソク ニ オヨボス エイキョウ

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Abstract

Species and abundance of odonate larvae were surveyed periodically at a littoral zone in an irrigation pond, in order to evaluate the effects of re-inundation after a long-term surface-exposure. The survey was done at ten plots on the shallow littoral zone with emerging plant community in 2010. Eight species and 68 individuals of odonate larvae were captured in November, nevertheless surfaces of the most of the plots were exposed until 2 days before of the survey date. Thus, it was estimated that a littoral zone’s potentiality as habitat for odonate larvae was restored by rise in water level.

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