Temporal changes in <I>Cladophora</I> spp. growth and corresponding influences on the environmental conditions and the clam <I>Corbicula japonica</I> in Lake Shinji nearshore waters

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  • Hayasaka Yuya
    Graduate School of Life and Environmental Science, Shimane University Ministry of Land, Infrastructure and Transport, Tohoku Regional Bureau
  • Haraguchi Hiroko
    Estuary Research Center, Shimane University
  • Kunii Hidenobu
    Estuary Research Center, Shimane University

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Other Title
  • 宍道湖汀線域における大型糸状緑藻シオグサ類の繁茂状況と周辺環境およびヤマトシジミに及ぼす影響
  • シンジコ テイセンイキ ニ オケル オオガタ シジョウ リョクソウ シオグサルイ ノ ハンモ ジョウキョウ ト シュウヘン カンキョウ オヨビ ヤマトシジミ ニ オヨボス エイキョウ

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Abstract

Temporal changes in the growth of the filamentous green algae belonging to the gunus Cladophora and the effects of algal growth on environmental conditions and the clam Corbicula japonica were studied from June 2016 to July 2017 in Lake Shinji nearshore waters. Cladophora spp. started to grow around June and disappeared by December. In a year, there were two peaks in coverage. Low dissolved oxygen concentration, reduce sediment condition, and low frequency of Corbicula japonica were observed under Cladophora spp. mats in summer. In particular, low oxidation-reduction potential (ORP) (-334 mV), high sulfide ion concentration, and no survival of C. japonica were recorded after Typhoon No. 16 in 2016. It was suggested that Cladophora spp. mats in the lacustirine nearshore environments cause environmental deterioration of lake water and substrate, and have lethal effects on C. japonica.

Journal

  • Aquaculture Science

    Aquaculture Science 67 (1), 57-64, 2019

    Japanese Society for Aquaculture Science

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