Paleoecology of seabirds at Nandao, Xisha Islands, South China Sea: Sub-fossil evidence for Ashmole's Halo during the Little Ice Age
Paleoecology of seabirds at Nandao, Xisha Islands, South China Sea: Sub-fossil evidence for Ashmole's Halo during the Little Ice Age
复制标题
南海西沙群岛南岛海鸟古生态：小冰期阿什莫尔光环的亚化石证据
DOI：
10.1016/j.palaeo.2018.05.023
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发表时间：
2018-09
期刊：
影响因子：
--
通讯作者：
Li Yeling
中科院分区：
文献类型：
--
作者：
Wu Libin;Liu Xiaodong;Xu Liqiang;Fu Pingqing;Wang Xueying;Jin Jing;Rao Zixuan;Zhou Yongli;Li Yeling
热带海鸟在珊瑚岛生态系统中发挥着关键作用，但其古生态学仍有许多不确定性。利用跨越800年的亚化石遗骸，对南海西沙群岛南岛的海鸟古生态进行了调查。在海鸟栖息的灌木丛下收集了鸟源沉积物，在那里发现了大量的海鸟/鱼类亚化石。我们使用反射光谱表明，海鸟种群规模整体较高的小冰期（LIA）相比，在此事件之前和之后的时期。尽管如此，海鸟的数量在LIA期间也有波动。南岛上的海鸟数量分别在公元1480-1550年和1650-1800年达到最高点，但在公元1550 - 1650年期间数量一直很低。南岛海鸟数量的减少可能与南岛向邻近的北岛的大规模迁徙有关。稳定同位素（δ 15 N和δ 13 C）分析也表明，在1550-1650 CE期间，南岛海鸟的觅食行为发生了变化。低种群规模的海鸟在岛屿附近觅食，并捕食较小的飞鱼，这是从鱼鳞的低δ 15 N和高δ 13 C值推断的，但在高种群时期，在远离岛屿的地方捕食较大的飞鱼。这种觅食行为的转变与阿什莫尔的光环预测一致，因为鸟类密度高的岛屿将导致殖民地附近的资源枯竭，并迫使更远的觅食远离殖民地。
Tropical seabirds play a key role in coral island ecosystems, but there are still many uncertainties regarding their paleoecology. Seabird paleoecology was investigated on Nandao Island, Xisha Islands, South China Sea, from sub-fossil remains spanning the past 800 years. Ornithogenic sediments were collected beneath seabird-inhabited shrubs where a large number of seabird/fish sub-fossils were recovered. We used reflectance spectroscopy to show that seabird population size was overall higher during the Little Ice Age (LIA) compared to periods before and after this event. Nonetheless, the number of seabirds also fluctuated during the LIA. Seabird populations on Nandao reached their highest points at 1480–1550 and 1650–1800 CE, respectively, but the population remained low from 1550 to 1650 CE. A large migration of seabirds from Nandao Island to the adjacent Beidao Island, where the population size surged at that time, is hypothesized to explain the corresponding decrease in the seabirds at Nandao. Stable isotope (δ15N and δ13C) analyses also suggest a change in foraging behavior by seabirds at Nandao during the period 1550–1650 CE. Seabirds at low population size foraged near the island and preyed upon smaller flying fish as inferred from low δ15N and high δ13C values in fish scales, but fed upon larger flying fish farther from the island during times of high population. This shift in foraging behavior is in accordance with predictions for Ashmole's Halo in that islands with high densities of birds will cause a depletion of resources near the colonies and force more distant foraging away from the colony.
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影响因子：
2.5
作者：
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通讯作者：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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