Trace elements (Cu, Zn, and Hg) and delta C-13/delta N-15 in seabird subfossils from three islands of the South China Sea and its implications
Trace elements (Cu, Zn, and Hg) and delta C-13/delta N-15 in seabird subfossils from three islands of the South China Sea and its implications
复制标题
南海三岛海鸟亚化石中的微量元素（Cu、Zn、Hg）和delta C-13/delta N-15及其意义
DOI：
10.1007/s10661-016-5274-7
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发表时间：
2016
影响因子：
3
通讯作者：
Nie Yaguang
中科院分区：
文献类型：
--
作者：
Xu Liqiang;Liu Xiaodong;Nie Yaguang
在南海西沙群岛的三个岛屿上采集了海鸟亚化石。通过元素分析，我们确定鸟粪是重金属Cu，Zn和Hg的重要来源。这些鸟粪样品中的铜和锌水平与野鸟粪便中的水平相当，但鸟粪中的汞含量低于先前报道的水平。营养位置显著影响海鸟对重金属的转移效率。尽管有一个共同的来源，微量元素，以及稳定的同位素（即，鸟粪δ 13 C和胶原蛋白δ 15 N），显示出岛屿特有的特征。较大岛屿上的鸟类亚化石具有相对较高的金属浓度，并显示出较高的营养地位。各岛屿间元素和同位素水平的分区表明，不同岛屿上海鸟的迁移效能不同，鸟类在各岛屿间的分布可能不均匀。岛屿面积可能是海鸟物种分布的驱动因素。
Seabird subfossils were collected on three islands of the Xisha Archipelago, South China Sea. Via elemental analysis, we identified that bird guano was a significant source for heavy metals Cu, Zn, and Hg. Cu and Zn levels in these guano samples are comparable to their levels in wildbird feces, but guano Hg was lower than previously reported. Trophic positions significantly impacted transfer efficiency of heavy metals by seabirds. Despite of a common source, trace elements, as well as stable isotopes (i.e., guano δ13C and collagen δ15N), showed island-specific characteristics. Bird subfossils on larger island had relatively greater metal concentrations and revealed higher trophic positions. Partition of element and isotope levels among the islands suggested that transfer efficacy of seabirds on different islands was different, and bird species were probably unevenly distributed among the islets. Island area is possibly a driving factor for distributions of seabird species.