Long-Chain Alkenones in Sediments of Lake Utichye-3 (Southern Siberia, Khakassia) as a Paleo-Indicator of Climate Change

IF 0.7 4区环境科学与生态学 Q4 ECOLOGY Contemporary Problems of Ecology Pub Date : 2024-06-04 DOI:10.1134/s1995425524700185

A. O. Bulkhin, V. V. Zykov, D. N. Marchenko, I. A. Kalugin, D. Y. Rogozin

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Abstract

Long-chain alkenones are produced exclusively by certain species of microalgae Isochrysidales of the order of haptophytes (Haptophyta). These are polyunsaturated methyl and ethyl ketones C35–C42 with 2–4 trans double bonds in the aliphatic chain. The length of the hydrocarbon chain and the degree of unsaturation of double bonds of a given class of lipids can vary depending on the environmental conditions of their producers. This class of substances is well preserved in the bottom sediments (BSs) of seas and lakes and therefore can serve as a paleoindicator of climate change. Currently, studies are being conducted to identify the functional dependences of the composition of long-chain alkenones on the temperature and salinity of water in continental water bodies. In arid regions, saline closed-basin lakes sensitively react by changing the volume of water and its salinity to variations in the “precipitation–evaporation” balance, and, consequently, the sediments of such lakes are sources of information about climate humidity variations in the past. In this work, we analyzed the vertical profile of long-chain alkenones in the upper part of the BSs of the Utichye-3 salt lake located in the steppe region of southern Siberia and compared it with changes in the surface level and salinity of the lake water recorded over a period of about 100 years. It has been shown that the content of long-chain alkenones in sediments can increase during periods of high salinity. Consequently, the composition of alkenones can be used to reconstruct changes in salinity from BSs of closed-basin lakes, and, therefore, to reconstruct dry periods in the history of the climate of the steppe zone of southern Siberia.

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乌季奇耶-3 湖（南西伯利亚，哈卡斯）沉积物中的长链烯酮作为气候变化的古指标

摘要长链烯酮类化合物仅由七鳃鳗目（Haptophyta）中某些种类的微藻（Isochrysidales）产生。它们是多不饱和甲基酮和乙基酮（C35-C42），脂肪链中有 2-4 个反式双键。某一类脂质的碳氢链长度和双键不饱和程度会因生产者的环境条件而异。这类物质在海洋和湖泊的底层沉积物（BSs）中保存完好，因此可以作为气候变化的古指标。目前正在开展研究，以确定长链烯酮的组成对大陆水体的温度和盐度的功能依赖性。在干旱地区，闭盆盐湖对 "降水-蒸发 "平衡的变化敏感地做出反应，改变水量和盐度，因此，这类湖泊的沉积物是过去气候湿度变化的信息来源。在这项研究中，我们分析了位于西伯利亚南部草原地区的乌季奇耶-3 盐湖 BS 上部的长链烯酮的垂直分布，并将其与约 100 年间记录的湖面水位和湖水盐度的变化进行了比较。结果表明，在高盐度时期，沉积物中长链烯酮的含量会增加。因此，烯酮类物质的组成可用于重建封闭盆地湖泊 BS 的盐度变化，从而重建西伯利亚南部草原区气候史上的干旱时期。

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来源期刊

Contemporary Problems of Ecology 环境科学-生态学

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

6-12 weeks

期刊介绍： Contemporary Problems of Ecology is a multidisciplinary periodical that publishes original works on the following subjects: theoretical and methodical issues of ecology, regional aspects of ecology, regional ecological disasters, structure and functioning of ecosystems, anthropogenic transformation of ecosystems. All basic aspects of modern ecology, including the most complicated interactions between living organisms and their environment, are presented. Some of the journal issues are dedicated to global changes in biological diversity at various levels of organization (populations, species, ecosystems) principles and methods of nature conservation.