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首页> 外文期刊>Polar biology >Stable isotope analyses of ancient and modern Adelie Penguin (Pygoscelis adeliae) mummies from the Ross Sea Region, Antarctica
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Stable isotope analyses of ancient and modern Adelie Penguin (Pygoscelis adeliae) mummies from the Ross Sea Region, Antarctica

机译：南极罗斯海地区古代和现代阿德利企鹅（Pygoscelis adeliae）木乃伊的稳定同位素分析

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摘要

We performed stable carbon (C-13) and nitrogen (N-15) isotope analyses of 12 ancient Adelie penguin (Pygoscelis adeliae) chick mummies recovered from abandoned colonies in the Ross Sea region, Antarctica, to investigate isotopic variation and fractionation over time. We also examined latitudinal variation in penguin diet to address if the modern dietary pattern (an increase in krill as dominant prey to the north) in this region has existed in the past or if this is a recent phenomenon. The ancient mummies range in age from48,000 C-14 years before present (BP) to500 calendar years BP. Feather, skin, bone, and toenail samples were analyzed from each individual where available. Identical analyses were performed on five modern mummified Adelie penguin chick carcasses and breast feathers of ten recently dead chicks from each of two active colonies, Cape Hallett and Adelie Cove. We found significantly lower N-15 values in Cape Hallett modern chicks as compared to those from Adelie Cove, indicating an entire trophic-level difference in modern diet that agrees with other studies in this region. The ancient mummies exhibited consistent isotopic fractionation of C-13 among the four different tissues through time. Variation in N-15 and C-13 values was greater in bone and skin than in feather or toenail, but N-15 in all four tissues indicated similar dietary trends with latitude as occurs in this region today. These results provide insight into the dietary variability of Adelie penguins across the Ross Sea region and a framework for similar analyses with other avian species.
机译：我们对从南极洲罗斯海地区的废弃殖民地中回收的12只古阿德利企鹅（Pygoscelis adeliae）小木乃伊进行了稳定的碳（C-13）和氮（N-15）同位素分析，以调查同位素随时间的变化和分离。我们还检查了企鹅饮食中的纬度变化，以解决该地区过去是否存在过现代饮食模式（磷虾作为北方主要优势捕食者的现象），或者这是否是最近的现象。古代木乃伊的年龄范围从> 48,000年前的C-14年（BP）到500历年的BP。在可用的情况下，对每个人的羽毛，皮肤，骨骼和脚趾甲样品进行分析。对五个活跃的木乃伊阿德利企鹅雏鸡尸体和来自两个活跃殖民地哈雷特角和阿德利·科夫的每个活跃殖民地的十只最近死亡的雏鸡的胸羽进行了相同的分析。我们发现，与来自Adelie Cove的雏鸡相比，哈雷特角现代雏鸡的N-15值显着降低，这表明现代饮食中营养水平的整体差异与该地区的其他研究一致。古代木乃伊在时间上在四个不同组织之间表现出一致的C-13同位素分馏。骨骼和皮肤中N-15和C-13值的变化大于羽毛或脚趾甲，但所有四个组织中的N-15均显示出与今天该地区类似的饮食趋势和纬度。这些结果提供了对整个罗斯海地区阿德利企鹅的饮食变化的见解，以及与其他鸟类进行类似分析的框架。

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