Ecological Studies on the Conservation of <I>Nannophya pygmaea</I> RAMBUR Populations and Habitats

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  • YABU Shinobu
    和歌山大学システム工学部・環境システム学科・自然環境システム大講座
  • NAKASHIMA Atsushi
    和歌山大学システム工学部・環境システム学科・自然環境システム大講座

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  • ハッチョウトンボ生息地の保全に関する生態学的研究
  • ハッチョウトンボ セイソクチ ノ ホゼン ニ カンスル セイタイガクテキ ケン

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Vegetations, land formations, water quality, and relative light intensity around the habitats of Nannophya pygmaea RAMEILLR were investigated in Motegi town, Tochigi prefecture, Japan. Vegetations which most imagines choiced were studied by their behaviors, such as flying, feeding and resting. As a result, territories of the imagines were formed in vegetations composed of Polygonum nipponense and Aneilema japonica, or Juncus effusus and Mosla dianthera. There were small and shallow ponds in the vegetations. The average relative light intensity on the ground surface was about 85 percentages. Feedings and resting for the imagines were found at J. effusus and Miscanthus sinensis comunities around the territories. Changes of the water levels of the ponds in the territories were very little from July to August and the water depths were about 1 to 3 centimeters. The water quality in their habitats was oligotrophic during this period.

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