Seasonal variability of water quality and metazooplankton community structure in Xiaowan Reservoir of the upper Mekong River

  • Xiaodong Wu | wxd565@163.com Chinese Academy of Sciences; Yunnan University, China.
  • Daming He Yunnan University, China.
  • Guijun Yang Jiangnan University, China.
  • Linlin Ye Nantong University, China.
  • Chunling Zhu Yunnan University, China.
  • Haifeng Jia Yunnan University, China.
  • Jinming Hu Yunnan University, China.

Abstract

Water quality problems in the Xiaowan Reservoir due to a recently built dam of upper Mekong River have became major ecological and economic concerns. The main goal of this work was thus to describe the present water quality and metazooplankton dynamics and to evaluate the effects of damming on aquatic ecosystem in the super reservoir. The water quality including conductivity, turbidity, Chlorophyll a, dissolved oxygen, total nitrogen, total phosphorus and metazooplankton communities were surveyed along the 30 km away from the dam in the reservoir from 2011 to 2012. Throughout our study, most of the water quality parameters showed clear temporal changes. The total nitrogen and phosphorus showed mean values of 0.9 and 0.04 mg L–1 at different sites. The dominated species of zooplankton showed typical seasonal succession. The most important factor in the determination of zooplankton throughout the year is water temperature and Chlorophyll a. The spatial distribution of water quality parameters and zooplankton communities fluctuated considerably among different sites. However, it is difficult to explain these spatial changes which may relate to the unstable water conditions. Our results showed that the area along the 30 km away from the dam of Xiaowan Reservoir belonged to lake-type environment. More attention should be paid on the aquatic ecosystems of the reservoirs which belong to the gorge area with high mountains and steep valleys.

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Author Biographies

Xiaodong Wu, Chinese Academy of Sciences; Yunnan University

Cryosphere Research Station on the Qinghai-Tibetan Plateau, State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute;

Asian International Rivers Center, Yunnan Key Lab of International Rivers and Transboundary Eco-security

Daming He, Yunnan University
Asian International Rivers Center, Yunnan Key Lab of International Rivers and Transboundary Eco-security
Guijun Yang, Jiangnan University

School of Environmental and Civil Engineering

Linlin Ye, Nantong University

School of Geography Science

Chunling Zhu, Yunnan University
Asian International Rivers Center, Yunnan Key Lab of International Rivers and Transboundary Eco-security
Haifeng Jia, Yunnan University
Asian International Rivers Center, Yunnan Key Lab of International Rivers and Transboundary Eco-security
Jinming Hu, Yunnan University
Asian International Rivers Center, Yunnan Key Lab of International Rivers and Transboundary Eco-security
Published
2014-02-20
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Original Articles
Supporting Agencies
This work was financially supported by the National Natural Science Foundation of China (41001032, U1033602, U1202232, 41101053, 41201076, and 41261002)
Keywords:
upper Mekong River, dam construction, Xiaowan Reservoir, metazooplankton, nutrients content
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How to Cite
1.
Wu X, He D, Yang G, Ye L, Zhu C, Jia H, Hu J. Seasonal variability of water quality and metazooplankton community structure in Xiaowan Reservoir of the upper Mekong River. J Limnol [Internet]. 2014Feb.20 [cited 2021May6];73(1). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2014.801