Radiocarbon dates from abandoned penguin colonies in the Antarctic Peninsula region
Radiocarbon dates from abandoned penguin colonies in the Antarctic Peninsula region
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DOI：
10.1017/s0954102001000414
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发表时间：
2001-09
影响因子：
1.6
通讯作者：
S. Emslie
中科院分区：
文献类型：
--
作者：
S. Emslie
本文对南极半岛地区12个岛屿上21个被遗弃的帽带企鹅（Pygoscelis antarctica）和ad<s:1>企鹅（P. adeliae）的有机遗骸进行了63次放射性碳测年，以确定该地区企鹅的占领历史。这一记录也为评估海平面变化、冰川推进和退缩以及企鹅对这些事件的反应提供了一种手段。通过应用ΔR = 700±50 BP和海洋校准曲线，对所有常规日期进行了海洋碳储层效应校正。63个校准日期给出了从现代到5990年BP的2σ范围（95%置信区间）。这些日期表明，沿着南极半岛，从北到南逐渐出现了更古老的活动。在北半岛没有超过大约540 BP的遗址，要么是因为它们还没有被发现，要么是因为更古老的遗址被溶蚀和冰川冲刷破坏了。来自阿德莱德岛Rothera Point附近一个地点的三个日期也用ΔR = 750±50和800±50 BP进行了校准。使用这两个其他ΔR值的校准日期之间没有发现差异，表明上升流强度变化的局部校正可能没有必要。
Sixty-three radiocarbon dates on organic remains from 21 abandoned colonies of chinstrap (Pygoscelis antarctica) and Adélie (P. adeliae) penguins on 12 islands in the Antarctic Peninsula region are evaluated for determining the occupation history of penguins in this region. This record also provides a means for assessing sea-level change, glacial advances and retreats, and population responses by penguins to these events. All conventional dates were corrected for the marine-carbon reservoir effect by applying a ΔR = 700±50 BP and marine calibration curves. The 63 calibrated dates give 2σ ranges (95% confidence intervals) from modern to 5990 yr BP. These dates indicate progressively older occupations from north to south along the Antarctic Peninsula. No sites older than approximately 540 BP occur in the northern peninsula, either because they have not yet been found or older sites have been destroyed by solifluction and glacial scouring. Three dates from one locality near Rothera Point, Adelaide Island, also were calibrated with a ΔR = 750 ± 50 and 800 ± 50 BP. No difference was found between calibrated dates using these two other ΔR values, indicating that local corrections for variation in upwelling intensity may not be necessary.