Bottom-up and top-down effects on codetermination of the dominant phytoplankton functional groups in Lake Erhai

被引：0
|
作者：
Yang Y. [1 ,2 ]
Yin C. [1 ,2 ]
Gong L. [1 ,2 ]
He W. [1 ,2 ]
Guo L. [1 ,2 ]
机构：
[1] Institute of Hydrobiology, Chinese Academy ofSciences, Wuhan
[2] University of Chinese Academy of Sciences, Beijing
来源：
Hupo Kexue/Journal of Lake Sciences | 2023年 / 35卷 / 04期
关键词：
bottom-up effect; eutrophication; Lake Erhai; phyloplankton functional groups; top-down effect;
D O I：
10.18307/2023.0413
中图分类号：
学科分类号：
摘要：
The shift of dominant phytoplankton functional groups (FGs) can be driven by zoopiankton grazing, water temperature and nutrient availability, but the interactive effects of these driving factors are not well understood. To understand the characteristics of the dominant phytoplankton FGs and their major driving factors in Lake Erhai, a subtropical highland lake in China, monthly sampling was conducted from January 2018 to December 2020. The main factors driving the shift of dominant phytoplankton FGs were analyzed by combining cluster analysis, variance partitioning analysis and redundancy analysis, respectively. In this study, 7 phytoplankton families and 96 genera were identified and divided into 27 FGs, among which 15 dominant FGs were identified. The results of cluster analysis showed that the FGs abundance could be classified into three periods (S, M and P Periods) dominated by different types of phytoplankton. S Period (which contained 18 months) was dominated by FGs SI and HI (representative species were filamentous cyanobacteria such as Pseudanabaena sp., Planktothrix sp., and Dolichospermum sp.). While FGs M (representative species were Microcystis colonies) was a high dominance of M Period (which contained 10 months), and FGs P and M (representative species were Fragilaria sp. and individual Microcystis, respectively) were the dominant FGs during P Period (which contained 8 months). Our results also confirmed that Carlson trophic stale index (TSI) (mainly total phosphorus) were the major drivers affecting the predominant FGs of filamentous algae in the studied lakes, while TSI and water temperature were significant drivers affecting the FGs dominated by Microcystis sp.. Therefore, the top priority for lakes experiencing early eutrophication is to reduce lake nutrient loading. And strategies aimed at increasing zoopiankton abundance could be considered to enhance the role and importance of zooplankton in ihe biomanipulation (lop-down effects) of filamentous algae or Microcystis blooms. © 2023 Science Press. All rights reserved.
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页码：1194 / 1202
页数：8
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