石垣島宮良湾の裾礁礁池における塊状ハマサンゴの分布特性

• 佐藤 崇範

  東京都立大学大学院理学研究科地理科学専攻

• 堀 信行

  東京都立大学大学院理学研究科地理科学専攻

• 鈴木 淳

  工業技術院地質調査所海洋地質部

書誌事項

タイトル別名

• The distribution of massive <i>Porites</i> in the moat of Miyara fringing reef, Ishigaki Island, Japan

抄録

The spatial distribution and morphologies of massive Porites colonies were investigated over a large area (1100m×200m) in the sandy moat of Miyara fringing reef, Ishigaki Island, Japan. Massive Porites (diameter>50cm) showed a preferential distribution for deeper depths (i. e., 2 to 3m). This distribution pattern suggested that massive Porites colonies were transported to deeper more stable habitats, as “mobile colonies”. Twenty-three percent of the colonies were mushroom shaped, with narrow stems attached to the substratum. Significant portions of mushroom shaped colonies (69%) were dislodged and 66% of them were tilted toward the dominant direction of water flow. The mushroom morphologies appear related to the high mobility of sandy sediments around the colonies, which interferes with ordinary growth of the colony base. Mobile colonies seems important for maintaining local coral populations in sandy habitats, which are often unsuitable habitats for larval settlement. In this case, physical environmental factors, such as water movement and micro-geomorphology, influence the distribution and population structure of coral communities in the sandy shallow habitats.

収録刊行物

• 日本サンゴ礁学会誌

  日本サンゴ礁学会誌 2000 (2), 43-50, 2000

  日本サンゴ礁学会

キーワード

• massive <i>Porites</i>
• moat
• mobile colony
• water movement
• micro-geomorphology

詳細情報

• CRID: 1390001204484742656
• NII論文ID: 130003670733
• DOI: 10.3755/jcrs.2000.43
• ISSN: 18825710
• ISSN: 13451421
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可