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| Long-term evolution and influencing factors of macrozoobenthos in Dongting Lake |
| Received:August 12, 2015 |
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| KeyWord:dimethyl sulfide;Thiobacillus neapolitanus;16S rDNA;swine manure composting;enzyme activity |
| Author Name | Affiliation | E-mail | | WANG Xiao-mao | Ecological and Environmental Monitoring Center of Dongting Lake of Hunan, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu(SEPSORSLD), Yueyang 414000, China | | | OU Fu-ping | Ecological and Environmental Monitoring Center of Dongting Lake of Hunan, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu(SEPSORSLD), Yueyang 414000, China | oufuping1964@163.com | | WANG Chou-ming | Ecological and Environmental Monitoring Center of Dongting Lake of Hunan, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu(SEPSORSLD), Yueyang 414000, China | | | TIAN Qi | Ecological and Environmental Monitoring Center of Dongting Lake of Hunan, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu(SEPSORSLD), Yueyang 414000, China | | | HUAN Qian | Ecological and Environmental Monitoring Center of Dongting Lake of Hunan, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu(SEPSORSLD), Yueyang 414000, China | | | ZHANG Lei | State Environmental Protection Key Laboratory for Lake Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | LU Shao-yong | State Environmental Protection Key Laboratory for Lake Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
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| Abstract: |
| In this study, the recent 20 year monitoring data were collected to analyze the variations of population composition, dominant species and biodiversity index of macrozoobenthos in Dongting Lake. The RDA method was also employed to examine the relationships between macrozoobenthos and environmental factors. Results showed that(1)the average richness of macrozoobenthos was 53 species in 22 years, and the main species were aquatic insects(41.5%) and mollusk(39.6%).(2)Species number and density of aquatic insects overall showed a slowly declining trend, while the density of mollusks basically kept stable, and species of mollusks showed a slowly increasing trend.(3)After 2010, the dominant species shifted from clean water typed aquatic insect, mollusk and gammarid to clean water typed and pollution-tolerant oligochaetes and mollusk.(4)The macrozoobenthos species, density and biodiversity in Eastern Dongting Lake were lower than those in Western and Southern Dongting Lake.(5)TP, chl-a and transparency were main factors influencing the population composition of macrozoobenthos in Dongting Lake. The loss of water and sediment influx from upstream rivers and the variation of water level resulted from operation of the Three Gorges Project had negative effects on the population composition of macrozoobenthos. |
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