Molluscs and ostracods of the Qarun Lake: preliminary report from FA-1 core in Faiyum Oasis, northern Egypt

• Autorzy: Szymanek M.

Identyfikatory

DOI

10.1515/squa-2017-0003

• Języki publikacji: EN

Abstrakty

EN

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‰.

Słowa kluczowe

EN

Molluscs; ostracods; Holocene; Qarun Lake; Egypt

• Wydawca: Institute of Geological Science Polish Academy of Science
• Czasopismo: Studia Quaternaria
• Rocznik: 2017
• Tom: Vol. 34, Nr 1
• Strony: 39--45
• Opis fizyczny: Bibliogr. 47 poz., rys.

Twórcy

autor

Szymanek M.

• University of Warsaw, Faculty of Geology, Warsaw, Poland

Bibliografia

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