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Amino Acids and Stable Carbon Isotope Distributions in Taihu Lake, China, Over the Last 15,000 Years, and Their Paleoecological Implications

Published online by Cambridge University Press:  20 January 2017

Wang Jinquan  and
Liu Jinling
Wang Jinquan
Affiliation:
Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008
Liu Jinling
Affiliation:
Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008
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Abstract

Amino acid, organic nitrogen, and stable carbon isotope (13C/12C) profiles through a core from East Taihu Lake are interpreted in terms of paleoecology and paleoclimate over the last ca. 15,000 yr. Lower amino acid contents and higher δ13C values at the base of the core represent a cool and arid climate, and coincide with low organic productivity. A marked increase in total amino acids and organic nitrogen, with a decrease in δ13C values from 193 to 90 cm (ca. 6500–6000 yr B.P.), indicates a warmer and moist climate, and greater organic productivity. Amino acids then decrease in abundance, while δ13C values increase progressively, beginning at 73 cm (ca. 6000 yr B.P.), reflecting cooling and lower organic productivity. The average δ13C values from a core from West Taihu Lake are evidently higher than values from East Taihu Lake. The latter may reflect a stream environment, whereas the high δ13C values from West Taihu Lake likely reflect autotrophic carbon sources and a lacustrine environment since 11,000 yr B.P.

Keywords

amino acidsstable carbon isotopepaleoecologyTaihu LakeChina
Type
Research Article
Information
Quaternary Research , Volume 53 , Issue 2 , March 2000 , pp. 223 - 228
Copyright
University of Washington

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