On the biodiversity of diatom communities in lakes of east China: Geochemical effects dominated after eutrophication

Aim: Over the last century, lakes all over the world have experienced significant eutrophication and become more susceptible to critical transitions. This has prompted a growing need to understand how community dynamics shift following ecological perturbations. This study aims to elucidate the present status, spatial patterns and determinants of biological diversity, and how they have changed in response to alterations driven by eutrophication. Location: Lakes of East China, mostly in the Yangtze River Basin Taxa: Bacillariophyceae (163 species in 33 genres)Â Methods: The environmental conditions of over sixty lakes were assessed based on parameters such as water quality, physical characteristics and biogeochemical constituents. Surface sediment samples and high-resolution sediment records were collected to quantify the biodiversity of diatom communities, and Principle Component Analysis (PCA) was used to determine the major environmental gradients. Meanwhile, linear regression, Canonic...研究目的：近一个世纪以来，全球范围内的湖泊均发生了显著的富营养化现象，且愈发容易发生临界转变。这使得学界对生态扰动后群落动态变化规律的探究需求日益增长。本研究旨在阐明生物多样性的现状、空间格局及其驱动因子，以及其如何响应富营养化驱动的环境改变而发生变化。 研究区域：中国东部湖泊，主体位于长江流域。 研究类群：硅藻门（Bacillariophyceae），涵盖33属共163个物种。 研究方法：基于水质、物理特征及生物地球化学组分等参数，对60余个湖泊的环境状况开展评估。采集表层沉积物样品与高分辨率沉积记录以定量解析硅藻群落的生物多样性，并通过主成分分析（Principle Component Analysis, PCA）确定主要环境梯度。同时采用线性回归、典范（Canonic）分析……