鹿児島県笠沙町崎ノ山の造成藻場の維持・拡大における砂の薄層被覆の役割

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  • 川俣 茂
    独立行政法人水産総合研究センター水産工学研究所
  • 吉満 敏
    鹿児島県水産技術開発センター:(現)鹿児島地域振興局農林水産部林務水産課
  • 徳永 成光
    鹿児島県水産技術開発センター:(現)商工労働水産部水産振興課
  • 久保 満
    鹿児島県水産技術開発センター
  • 田中 敏博
    鹿児島県水産技術開発センター:(現)商工労働水産部水産振興課

書誌事項

タイトル別名
  • The Role of Thin Sediment Cover in the Persistence and Extension of Artificial Sargassum Beds off Sakinoyama, Kasasa, Kagoshima
  • カゴシマケン カササマチサキ ノサン ノ ゾウセイ モバ ノ イジ ・ カクダイ ニ オケル スナ ノ ハクソウ ヒフク ノ ヤクワリ

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抄録

To restore macroalgal beds in sea urchin-dominated barren areas, concrete blocks were placed and seeded with germlings of several Sargassum species at a wave-sheltered shallow site off Sakinoyama, Kasasa, Kagoshima, Japan in 1999. This resulted in a remarkable extension and long-term persistence of Sargassum beds, without removing urchins. Previous studies suggested that thin sediment cover might exclude sea urchins and allow the recruitment of sediment-tolerant species such as Sargassum duplicatum. Field studies were added to understand the mechanisms for the establishment of Sargassum in more detail. Transect surveys suggested that sea urchins including long-spined Diadema spp. having high mobility do not move into the area with >50% of even thin sediment cover, although shorter-spined Echinometra sp. translocated to small blocks within sand-covered areas moved over sand. Survivorship of caged Sargassum germlings on cobbles translocated to sediment-free urchin barrens were considerably lower than the previous observations in sedimented Sargassum beds, suggesting that thin sedimentation might prevent herbivory not only by urchins but also by mesograzers. However, outplanting S. duplicatum germlings suggested that thin sediment cover might not ensure their survival due to other factors such as feeding by sandy bottom organisms. Maintenance and recent reduction of Sargassum stands are also discussed.

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