鰻池のプランクトン

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書誌事項

タイトル別名
  • ウナギチ ノ プランクトン
  • Seasonal Variation of Plankton at Unagi-ike
  • ウナギイケ ノ プランクトン

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抄録

The study of plankton was carried out at Unagi-ike, a typical caldera lake in southern Japanduring the period from 1977 to 1979. At Unagi-ike the transparency of waters and aspects ofplankton organisms have shown remarkable changes for the past forty years. The transparencyranged from 1.4m~6m and 3.1 m in average in 1978. Plankton volume increased andshowed marked seasonal variation and exhibited blooming in these years. Some dominantspecies are as follows; Synedra ulna, Anabaena affinis, Microcystis aeruginosa, Spyrogyra spp., Eudorina elegans, Polyarthra trigla, Conochilus unicornis, Asplanchna priodonta, Bosmina longirostris and Bosminopsis deitersi. This abundance of plankton in recent years indicate that Unagi-ike has changedfrom oligotrophic to eutrophic lake in the past forty years.

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