Can the morphological traits of benthic testate amoebae in a freshwater lake be indicators of depth and environmental conditions?

IF 1.4 4区 环境科学与生态学 Q3 LIMNOLOGY Limnology Pub Date : 2024-07-01 DOI:10.1007/s10201-024-00758-5
Vlad V. Sysoev, Dmitry G. Seleznev, Hoan Q. Tran, Fedor Y. Reshetnikov, Denis V. Tikhonenkov
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Abstract

Testate amoebae are widely used as proxies in palaeoecological reconstructions of lacustrine environments. However, our knowledge on their morphological adaptation to depth is still limited. This study aims to determine correlations between the morphological and size structure of testate amoeba communities and depth and some other environmental variables along a depth gradient from 0 to 57 m in mesotrophic Valdayskoe Lake, Russia. The morphological structure of testate amoeba communities in the bottom surface sediments of the lake and their distribution along the depth gradient were described. Redundancy analysis indicated that sampling depth, temperature, pH, and slope angle significantly explained the total variance in the community compositions, which were classified into three morphological groups. The set of morphotraits of testate amoebae communities differed drastically above and below the thermocline and may be used as an indicator of the depths. Above and below the thermocline, the morphological structure of testaceans is also determined by other environmental variables associated with the habitats they were found. The weighted and median body size of testate amoebae generally decreases with depth, but bottom relief influences the body size structure of the community via differences in the accumulation of organic matter on slopes and flat sites. These data may contribute to a better interpretation of palaeoecological records of subfossil testate amoebae in lacustrine surface sediments and serve as a basis for the development of a transfer function for reconstructing lake depths.

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淡水湖底栖睾丸变形虫的形态特征可以作为深度和环境条件的指标吗?
在湖沼环境的古生态重建中,睾丸变形虫被广泛用作代用指标。然而,我们对其形态适应深度的了解仍然有限。本研究旨在确定俄罗斯中营养Valdayskoe湖0-57米深度梯度上试管阿米巴群落的形态和大小结构与深度和其他一些环境变量之间的相关性。研究描述了湖底表层沉积物中试管阿米巴群落的形态结构及其沿深度梯度的分布。冗余分析表明,取样深度、温度、pH 值和斜坡角度能显著解释群落组成的总方差,群落被划分为三个形态组。睾丸变形虫群落的形态特征组在温跃层上下差异很大,可作为深度指标。在温跃层上下,睾丸虫的形态结构还取决于与其所处生境相关的其他环境变量。睾丸变形虫的加权体型和中位体型一般随深度的增加而减小,但海底地形通过斜坡和平地有机物积累的差异影响群落的体型结构。这些数据有助于更好地解释湖泊表层沉积物中的亚化石睾丸变形虫的古生态学记录,并为开发重建湖泊深度的转移函数奠定基础。
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来源期刊
Limnology
Limnology 地学-湖沼学
CiteScore
4.30
自引率
6.20%
发文量
15
审稿时长
>12 weeks
期刊介绍: Limnology is a scientific journal published three times a year, in January, April, and August, by Springer in association with the Japanese Society of Limnology. The editors welcome original scientific contributions on physical, chemical, biological, or related research, including environmental issues, on any aspect of basic, theoretical, or applied limnology that present significant findings for the community of scholars. The journal publishes Rapid communications, Research papers, Review articles, Asia/Oceania reports, and Comments. The aims and scope of Limnology are to publish scientific and/or technical papers in limnological sciences, to serve as a platform for information dissemination among scientists and practitioners, to enhance international links, and to contribute to the development of limnology.
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