Molluscs and Ostracods of the Qarun Lake: Preliminary Report From FA-1 Core in Faiyum Oasis, Northern Egypt

IF 0.6 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Studia Quaternaria Pub Date : 2017-06-27 DOI:10.1515/squa-2017-0003

M. Szymanek

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引用次数: 2

Abstract

Abstract A research was conducted on the Holocene lake sediments from the full-cored FA-1 drilling at the southern shore of the Qarun Lake in the Faiyum Oasis in northern Egypt. Altogether 10 taxa of molluscs and 8 taxa of ostracods were identified in the examined deposits, with total amounts of 768 and 2872 individuals, respectively. The fauna was investigated with palaeoecological purpose and allowed for preliminary reconstruction of sedimentary environment in the lake. The occurrence of Valvata nilotica Jickeli, 1874 and Gomphocythere sp. in the lower part of the core and a low proportion of carapaces (2.4-28%) indicated freshwater and higher-energy conditions, respectively. Rapid expansion of Cyprideis torosa (Jones, 1850) at a depth of 18 m could point to very short saline episode in the lake. The increase in salinity and drop of water level were evidenced in the uppermost part of the core (4-3.5 m), when the lake was dominated by Hydrobia ventrosa (Montagu, 1803), Cerastoderma glaucum (Poiret, 1789) and C. torosa. The steady sedimentation in a shallow lake was also supported by considerable amount of complete ostracod carapaces (45%). The faunal assemblage and smooth valves of C. torosa suggested salinity of 14-25‰.

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喀润湖软体动物和介形类:埃及北部Faiyum绿洲FA-1岩心的初步报告

摘要对埃及北部Faiyum绿洲Qarun湖南岸全芯FA-1钻孔的全新世湖泊沉积物进行了研究。在沉积物中鉴定出软体动物10个分类群和介形虫8个分类群，总数分别为768和2872只。研究区系具有古生态学意义，为初步重建湖泊沉积环境奠定了基础。Valvata nilotica Jickeli, 1874和Gomphocythere sp.在岩心下部的分布和低比例的甲壳(2.4 ~ 28%)分别表明了淡水和高能量条件。在18米深度的快速扩张(Jones, 1850)可能表明该湖的盐化期非常短。岩心最上部(4 ~ 3.5 m)盐度升高，水位下降，主要为ventrosa Hydrobia (Montagu, 1803)、Cerastoderma glaucum (Poiret, 1789)和C. torosa。相当数量的完整甲壳(45%)也支持了浅水湖泊的稳定沉积。金龟的区系组合和光滑阀显示盐度为14 ~ 25‰。

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来源期刊

Studia Quaternaria GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

1.40

自引率

0.00%

发文量

期刊介绍： Studia Quaternaria is designed to publish scientific works concerning the Quaternary, on local, regional and global scale. Studia Quaternaria is interested in all fields of research dealing with stratigraphy and reconstruction of the past environments, including palaeogeography, palaeoecology, palaeoclimatology, palaeohydrology etc. The journal is also open to studies of natural environmental processes, and to recognition of mechanisms involved in the dynamics of our environment. The clue is that the Quaternary is still ongoing and vivid, and understanding of its past and present development support each other.