The Key Laboratory of Aquatic Biodiversity and Conservation, Institute of Hydrobiology, Chinese Academy of Sciences, Hubei, 430072, China.
Eco-Environment Monitoring Centre of Dongting Lake, Yueyang, 414000, China.
Environ Sci Pollut Res Int. 2020 Apr;27(12):13066-13080. doi: 10.1007/s11356-020-07773-w. Epub 2020 Feb 3.
The Yungui Plateau lakes, which are characterized by a highly endemic biodiversity, have been suffering severely from anthropogenic intervention in the recent decades. Studies on the response of these biodiversity to human-mediated effects are still limited. Here, we selected the typical Lake Dianchi to investigate the correlation between macroinvertebrate spatiotemporal dynamics and human-induced eutrophication across a 2-year span (2009-2010). A total of 26 taxa were recorded, and the assemblage pattern of the macroinvertebrate community was mainly controlled by the spatiotemporal (region, season, and year) density fluctuations of some pollution-tolerant species (Limnodrilus hoffmeisteri, Tubifex tubifex, Branchiura sowerbyi, and Chironomus plumosus). Taxon richness, total density, biomass, and the abundance of Oligochaeta and Chironomidae decreased from the north to the south of the lake but were much higher in 2009 than in 2010. Moreover, the high densities of total assemblages and oligochaete occurred during spring and/or autumn, whereas that of chironomids was only high during summer. The contributions of important factors varied in different seasons, but the community variations were mainly shaped by eutrophication-related factors (e.g., Chla, N, and P). Variance partitioning analyses showed that aquatic factors were able to explain more community variations than sediment (6.9-36.6 vs. 5.3-14.7%) across seasons, but their interactive effects were negligible. The results of this study will be beneficial for restoring and managing hypereutrophic lakes in the Yungui Plateau and imply the necessity of long-term monitoring in bioassessment projects involving intensively disturbed lakes.
云贵高原湖泊具有高度特有生物多样性，但在最近几十年受到人类活动的严重干扰。目前，针对这些生物多样性对人为影响的响应研究仍然有限。在这里，我们选择了典型的滇池来调查 2 年（2009-2010 年）期间宏观生物时空动态与人为富营养化之间的相关性。共记录了 26 个分类群，宏观生物群落的组合模式主要受一些耐受污染物种（霍夫迈斯特厚皮漂蛹螺、颤蚓、苏氏尾鳃蚓和多刺裸摇蚊）的时空（区域、季节和年份）密度波动控制。分类丰富度、总密度、生物量以及寡毛纲和摇蚊科的丰度从湖的北部到南部逐渐减少，但 2009 年比 2010 年高得多。此外，总生物量和寡毛纲的高密度出现在春季和/或秋季，而摇蚊科的高密度仅出现在夏季。不同季节重要因素的贡献有所不同，但群落变化主要由富营养化相关因素（如 Chla、N 和 P）塑造。方差分解分析表明，水生因素在不同季节比沉积物（6.9-36.6 对 5.3-14.7%）能够解释更多的群落变化，但它们的相互作用可以忽略不计。本研究结果将有助于恢复和管理云贵高原富营养化湖泊，并暗示在涉及受强烈干扰湖泊的生物评估项目中进行长期监测的必要性。
