Larger foraminifera and sedimentation around Fongafale Island, Funafuti Atoll, Tuvalu
Larger foraminifera and sedimentation around Fongafale Island, Funafuti Atoll, Tuvalu
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图瓦卢富纳富提环礁丰法莱岛周围较大的有孔虫和沉积物
DOI：
10.1007/s00338-004-0396-8
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发表时间：
2004
期刊：
影响因子：
3.5
通讯作者：
D. Garton
中科院分区：
文献类型：
--
作者：
J. Collen;D. Garton
大型有孔虫是图瓦卢富纳富提环礁丰加法尔岛周围沿海沉积物的重要组成部分，目前至少有10种。在浅水泻湖中，有孔虫（主要为Amphistegina lessonii、A.在砂和砾石中，主要成分是绿藻、绿藻、珊瑚和软体动物，其次是钙质红藻和绿色藻类。在更深的水域，Halimeda取代了有孔虫。靠近海岸，磨蚀去除了Halimeda，并可能减少有孔虫测试的数量。虽然离岸搬运似乎很小，但在岸上和离岸方向都有一些沉积物移动。在陆地上，溶解作用优先去除文石，可能会增加有孔虫测试的比例，高达83%的地下沉积物。海洋一侧的沉积物主要是1972年飓风贝贝抛起的珊瑚和珊瑚状红藻碎片，后来向近海和泻湖移动。
Larger foraminifera are an important component of coastal sediments around Fongafale Island, Funafuti Atoll, Tuvalu, and at least 10 species are present. In the shallow lagoon, foraminifera (mainly Amphistegina lessonii, A. lobifera, Baculogypsina sphaerulata, Calcarina spengleri, Marginopora vertebralis, and Sorites marginalis) are the dominant component of sand and gravel, followed in decreasing order of abundance by calcareous red and green algae, coral, and molluscs. In deeper water, Halimeda replaces the foraminifera. Close inshore, abrasion removes Halimeda and may reduce the number of foraminiferal tests. There is some sediment movement in both onshore and offshore directions although offshore transport appears minor. On land, dissolution that preferentially removes aragonite may increase the proportion of foraminiferal tests to as much as 83% of the subsurface sediment. Sediments on the ocean side are dominated by coral and coralline red algal debris thrown up in 1972 by cyclone Bebe and later moved inshore and lagoonward.