Engineering Research Center of Ecology and Agricultural Use of Wetland (Ministry of Education), College of Agriculture, Yangtze University, Jingzhou 434025, China; Aquatic Ecohealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Aquatic Ecohealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
J Environ Sci (China). 2021 Feb;100:287-297. doi: 10.1016/j.jes.2020.07.026. Epub 2020 Aug 14.
The global decline of freshwater biodiversity caused by climate change and human activities are supposed to disrupt ecosystem services related to water quality and alter the structure and function of aquatic communities across space and time, yet the effects of the combination of these factors on plankton community ecosystem has received relatively little attention. This study aimed to explore the impacts of disturbances (e.g. human activity, temperature, precipitation, and water level) on phytoplankton community structure (i.e. community evenness and community composition) and function (i.e. resource use efficiency) in four subtropical reservoirs over 7 years from 2010 to 2016. Our results showed that community turnover (measured as community dissimilarity) was positively related to disturbance frequency, but no significant correlation was found between phytoplankton biodiversity (i.e. evenness) and disturbance frequency. Phytoplankton resource use efficiency (RUE = phytoplankton biomass/ total phosphorus) was increased with a higher frequency of disturbance with an exception of cyanobacteria. The RUE of Cyanobacteria and diatoms showed significantly negative correlations with their community evenness, while the RUE of Chlorophyta exhibited a positive correlation with their community turnover. We suggest that multiple environmental disturbances may play crucial roles in shaping the structure and functioning of plankton communities in subtropical reservoirs, and mechanism of this process can provide key information for freshwater uses, management and conservation.
气候变化和人类活动导致的全球淡水生物多样性减少，预计将破坏与水质有关的生态系统服务，并在时间和空间上改变水生群落的结构和功能，但这些因素的组合对浮游生物群落生态系统的影响却相对较少受到关注。本研究旨在探讨干扰（如人类活动、温度、降水和水位）对 2010 年至 2016 年间四个亚热带水库浮游植物群落结构（即群落均匀度和群落组成）和功能（即资源利用效率）的影响。研究结果表明，群落周转率（以群落差异度衡量）与干扰频率呈正相关，但浮游植物生物多样性（即均匀度）与干扰频率之间没有显著相关性。浮游植物资源利用效率（RUE=浮游植物生物量/总磷）随着干扰频率的增加而增加，但蓝藻除外。蓝藻和硅藻的 RUE 与它们的群落均匀度呈显著负相关，而绿藻的 RUE 与它们的群落周转率呈正相关。我们认为，多种环境干扰可能在塑造亚热带水库浮游生物群落的结构和功能方面发挥关键作用，这一过程的机制可为淡水利用、管理和保护提供关键信息。
