A study on Holocene foraminifera from the Aral Sea and West Siberian lakes and its implication for migration pathways
A study on Holocene foraminifera from the Aral Sea and West Siberian lakes and its implication for migration pathways
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DOI：
10.1016/j.quaint.2010.03.009
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发表时间：
2011
影响因子：
2.2
通讯作者：
F. Riedel;A. Kossler;P. Tarasov;B. Wünnemann
中科院分区：
文献类型：
--
作者：
F. Riedel;A. Kossler;P. Tarasov;B. Wünnemann
对咸海晚全新世岩心的有孔虫多样性进行了研究，区分了4种有孔虫。通过扫描电子显微镜照片，列出并记录了该种。所有已确认的咸海物种都属于庞托-里海动物群复合体。另一个庞托-里海有孔虫物种发现于西西伯利亚低地南部吐尔盖河谷中全新世库什穆伦湖的沉积物中。在全新世期间，里海和咸海的水位都不够高，无法通过图盖河谷与西西伯利亚建立北部连接。在冰川晚期，由于西西伯利亚北部巨大的冰川湖泊泛滥，可能存在这样一条水道。然而，水流将被引导到南方，防止有孔虫向北方迁移。此外，淡水条件不会允许有孔虫存活。因此，有孔虫是通过水鸟从里海或咸海运往西西伯利亚湖泊的。鸟类介导的有孔虫对湖泊生态系统的殖民不是一个例外，而是一个常规的过程。在里海水鸟的帮助下，咸海在全新世期间被重新殖民了几次。
Late Holocene cored sediments from the Aral Sea were examined in respect of foraminiferal diversity and the tests of 4 species of foraminifera were differentiated. The species are listed and documented by SEM photographs. All of the identified species from the Aral Sea belong to the Ponto-Caspian faunal complex. Another Ponto-Caspian foraminiferal species is found in the mid-Holocene sediments of Kushmurun Lake located in the Turgai Valley in the southern part of the West Siberian Lowland. During the Holocene neither the water level of the Caspian Sea nor that of the Aral Sea was high enough to create a northern connection with West Siberia via the Turgai Valley. During the late glacial such a waterway may have existed due to overflowing of huge proglacial lakes in northern West Siberia. The water flow, however, would have been directed to the south preventing foraminiferal migration to the north. Moreover, the freshwater conditions would not have allowed foraminifers to survive. Thus, foraminifera were transported to the West Siberian lakes from the Caspian Sea or from the Aral Sea by water birds. Avian-mediated colonization of lacustrine ecosystems by foraminifera is not an exception, but a regular process. The Aral Sea was re-colonized during the Holocene several times with the aid of water birds from the Caspian Sea.