空间异质性对硅藻组合组成估算的影响——以立陶宛东北部因布拉达斯湖为例

IF 0.5 4区地球科学 Q4 GEOLOGY

Baltica Pub Date : 2021-01-01 DOI:10.5200/baltica.2021.1.10

L. Balakauskas, G. Vaikutienė, M. Paškevičiūtė, V. Valskys, A. Spiridonov

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引用次数: 1

摘要

对立陶宛东北部一个浅中型湖泊的表层沉积物进行了高空间分辨率硅藻和着火损失分析，以研究湖泊中硅藻组合的空间异质性程度，以及水深对硅藻组成的影响。沉积物和硅藻组合的组成特征与水深密切相关;一些不太显著的变化归因于支流集水区。整个湖的硅藻组合组成相当均匀(Morisita-Horn相似指数在湖的大多数位置为>0.9，相对于其他地方)，特别是在其较深的部分。我们的案例表明，最具代表性的点并不像大多数化石研究中假设的那样位于湖的中心。研究现代硅藻的空间异质性有助于硅藻的选址和化石资料的解释。

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Effects of spatial heterogeneity on the estimation of diatom assemblage composition: an example of Lake Imbradas (NE Lithuania)

High spatial resolution diatom and loss-on-ignition analyses were carried out on the surface sediments of a shallow, medium-sized lake in north-eastern Lithuania to examine the degree of spatial heterogeneity of diatom assemblages in the lake, as well as the influence of water depth on diatom compositions. The compositional properties of sediments and diatom assemblages show a strong relationship with water depth; some less prominent changes were attributed to the tributary catchment. Diatom assemblage compositions are rather homogenous throughout the lake (Morisita-Horn similarity indices make >0.9 in most locations of the lake, in relation to others), especially in its deeper parts. Our case shows that the most representative point does not lie in the centre of the lake, as it is assumed in most of fossil studies. Studies of spatial heterogeneity of modern diatoms can facilitate site selection and fossil diatom data interpretation.

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来源期刊

Baltica 地学-地质学

CiteScore

1.30

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： BALTICA is an international periodical journal on Earth sciences devoted to the Baltic countries region and the Baltic Sea problems. This edition as a Yearbook is established in 1961 by initiative of Academician Vytautas Gudelis. Since 1993, an Editor-in-Chief of the journal became Academician Algimantas Grigelis. BALTICA is published biannually (in June and December) in cooperation with geoscientists of the circum-Baltic States. BALTICA is publishing original peer-reviewed papers of international interests on various Earth sciences issues. The particular emphasis is given to Quaternary geology, climate changes and development of ecosystems, palaeogeography, environmental geology, as well as stratigraphy, tectonics, sedimentology and surface processes with relevance to the geological history of the Baltic Sea and land areas. Journal emphasizes modern techniques, methodology and standards. The journal structure comprises original articles, short reviews, information, bibliography.