Testate amoebae record from the Laptev Sea coast and its implication for the reconstruction of Late Pleistocene and Holocene environments in the Arctic Siberia.
Testate amoebae record from the Laptev Sea coast and its implication for the reconstruction of Late Pleistocene and Holocene environments in the Arctic Siberia.
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拉普捷夫海沿岸的遗嘱变形虫记录及其对北极西伯利亚晚更新世和全新世环境重建的意义。
DOI：
10.1016/j.palaeo.2008.11.003
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
P. Tarasov
中科院分区：
文献类型：
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作者：
S. Müller;A. Bobrov;Lutz Schirrmeister;Andrei A. Andreev;P. Tarasov
我们的研究旨在寻找拉普捷夫海南岸约150公里处的马蒙托夫克雷克角（Cape Mamontov Klyk）（73°60 '-73 ° 63' N，116°88 '-117 ° 18' E）的表面和化石沉积物中的遗嘱amobae（TA）。莉娜三角洲并讨论TA分析在北极西伯利亚冰川/间冰期环境重建中的潜力。放射性碳年龄测定表明，所研究的沉积物之间积累约45，00014 C年BP和现在。在最近的10个地表样品和59个化石样品中，共鉴定出98个TA类群。现代和化石样品中TA的分类鉴定和生态分析结果表明，土壤水分条件发生了重大变化。我们的研究结果表明，土壤生活类群占主导地位的TA组合在研究地点在过去的45,000年。在Kargin Interstadial（约45，000 -25，00014 C yr BP）期间，研究区域的环境条件最有利（相对温暖和潮湿）。一个相反的情况是重建的萨尔坦体育场（约。25，000 -15，00014 C年BP）。在Kargin Interstadial，最佳条件之间发生约44,000和40,00014 C年BP的特点是最高的TA丰度和类群多样性。这个最初的最佳阶段之后是干燥和寒冷的条件下约40000 - 3000014 C年BP的间隔。这些沉积物的年代约在公元前。24,000和18, 00014 C年BP显示低TA丰度和多样性，在协议的最大阶段的末次冰期更冷，更干燥的环境。全新世的开始是由一个广泛的代表性的专性亲水类群，特别是从属Difflugia，表明潮湿和相对温暖的条件。通过与研究剖面以及邻近北极地区使用的其他环境指标进行比较，我们的结果表明TA分析可以提供有价值的信息，有助于更好地了解北极西伯利亚晚第四纪气候和环境。
Our study aims to look for testate amobae (TA) in the surface and fossil sediments from the Cape Mamontov Klyk (73°60′–73°63′ N, 116°88′–117°18′ E), southern coast of the Laptev Sea, ca 150 km west of the Lena Delta and to discuss the potential of TA analysis for Glacial/Interglacial environmental reconstructions in Arctic Siberia. The radiocarbon age determination suggests that the studied sediments accumulated between ca 45,00014C yr BP and present. A total of 98 TA taxa were identified in the 10 recent surface and 59 fossil samples. Results of taxonomical identification and ecological analysis of TA in the modern and fossil samples suggest that major changes in the soil moisture conditions took place. Our results show that soil-living taxa dominated the TA assemblages at the study sites during the past 45,000 years. The environmental conditions of the study area were most favourable (relatively warm and humid) during the Kargin Interstadial (ca 45,000–25,00014C yr BP). An opposite situation is reconstructed for the Sartan Stadial (ca. 25,000–15,00014C yr BP). During the Kargin Interstadial, optimum conditions occurred between ca 44,000 and 40,00014C yr BP characterised by highest TA abundances and taxa diversity. This initial optimal phase was followed by the interval with drier and colder conditions about 40,000–30,00014C yr BP. The sediments dated between ca. 24,000 and 18,00014C yr BP show low TA abundances and diversity, in agreement with the much colder and drier environments during the maximum phase of the Last Glacial. The onset of the Holocene is indicated by a broad representation of obligate hydrophilic taxa, especially from genus Difflugia, suggesting wet and relatively warm conditions. By comparison with other environmental proxies used in the studied sections as well as from the neighbouring arctic regions our results suggest that TA analysis can provide valuable information, contributing to the better understanding of the Late Quaternary climate and environments in Arctic Siberia.