Nitrogen isotope analyses of reindeer (Rangifer tarandus), 45,000 BP to 9,000 BP: Palaeoenvironmental reconstructions
Nitrogen isotope analyses of reindeer (Rangifer tarandus), 45,000 BP to 9,000 BP: Palaeoenvironmental reconstructions
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距今 45,000 至 9,000 年前的驯鹿 (Rangifer tarandus) 氮同位素分析：古环境重建
DOI：
10.1016/j.palaeo.2008.01.019
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
R.E.M. Hedges
中科院分区：
文献类型：
--
作者：
Stevens;Jacobi;Street;Germonpré;Münzel;Conard;R.E.M. Hedges
更新世动物群δ15N变化被认为反映了气候和环境条件的变化。然而，研究人员仍不清楚哪些气候/环境参数是更新世动物群δ15N值的主要控制因素。通过对晚更新世驯鹿(Rangifer Tarandus)胶原蛋白的氮同位素分析，研究了晚更新世多年冻土的发育是否与δ15N值的变化相吻合。在45ka BP之后，驯鹿的δ15N下降，在最后一次冰川最大时期(LGM)之后观察到δ15N的最低值，在15到1110ka BP之间。在更北部的地区，δ15N的下降幅度似乎比法国南部更大，这一模式与之前观察到的马的情况类似。在全球范围内，生态系统δ15N受氮循环的相对开放程度控制，而氮循环又受气候控制。在寒冷和/或潮湿地区，土壤和植物的δ15N含量较低，而在炎热和/或干旱地区，δ15N含量较高。驯鹿δ15N下降的区域模式模拟了欧洲气候恶化的模式，在末次盛会上达到顶峰，北欧的气候降温比南欧更强烈。然而，在气温开始上升后，驯鹿的δ15N值最低。这可能是由于氮循环对气温上升的反应滞后所致。或者，它可能与永久冻土退化对土壤和植物δ15N的影响有关，从而与动物群δ15N的影响有关。在年轻的仙女木期间，重新开始的气候降温并没有看到驯鹿δ15N的下降。然而，有限的数据确实表明，年轻的仙女木在驯鹿δ15N值上出现了枯竭。
Pleistocene faunal δ15N variations are thought to reflect changes in climatic and environmental conditions. Researchers are still unclear, however, which climatic/environmental parameter is the primary control on Pleistocene faunal δ15N values. Through extensive nitrogen isotope analysis of Late Pleistocene reindeer (Rangifer tarandus) collagen we investigated whether permafrost development during the Late Pleistocene coincided with changes in δ15N values. After 45 ka BP reindeer δ15N declined, with lowest δ15N values observed after the Last Glacial Maximum (LGM), between 15 and 11 ka BP. The decline in δ15N appears to be of a greater magnitude in more northern regions than in the South of France, a pattern similar to that previously observed for horse. On a global scale, ecosystem δ15N is controlled by the relative openness of the nitrogen cycle, which in turn is controlled by climate. Low soil and plant δ15N are observed in cold and/or wet regions and high δ15N are seen in hot and/or arid areas. The regional pattern in reindeer δ15N decline mimics the pattern of climatic deterioration in Europe culminating at the LGM, with climate cooling being more intense in northern Europe than in southern Europe. However, the lowest reindeer δ15N values are observed after temperatures started to rise. This may have been due to a lag in the response of the nitrogen cycle to increasing temperatures. Alternatively it may have been linked to the influence of permafrost degradation on soil and plant δ15N and thus faunal δ15N. The renewed climatic cooling during the Younger Dryas did not see a fall in reindeer δ15N. Limited data does, however, suggest a post Younger Dryas depletion in reindeer δ15N values.
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DOI：
--
发表时间：
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期刊：
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