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| Composition and influential factors of algal function groups in Dongting Lake |
| WANG Xing1,2,3, LI Li-qiang4, ZHENG Bing-hui1,2,3, LIU Yan1,2, TIAN Qi4, WANG Li-jing1,2,3 |
1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. State Environmental Protection Key Laboratory of Drink Water Resource Protection, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3. State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Yueyang 414000, China;
4. Dongting Lake Eco-Environment Monitoring Centre, Yueyang 414000, China |
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Abstract This research was performed at March, June, September and December in 2013 at 11sections of Dongting Lake, aiming to investigate the algal function groups. A total of 24 kinds of algal function groups were identified:A、B、C、D、E、F、G、H1、J、LO、LM、M、MP、N、P、S1、SN、T、W1、W2、X1、X2、X3、Y, which reflected the habitat characteristics with species sensitive to the onset of stratification, and which are adapt to frequently stirred up, inorganically turbid, and mesotrophic to eutrophic shallow lakes. The algal function groups was dominated by B (mesotrophic waters in small-and mediumsized lakes with species sensitive to the onset of stratification), D (shallow turbid waters), J (well-mixed, enriched shallow lakes), MP (frequently stirred up, inorganically turbid shallow lakes), P (well-mixed, mesotrophic to eutrophic shallow lakes) and Y (refers to a wide range of habitats) based on the dominant degree (>0.02) and significant differences which were found on algal function groups across 11sampling sections in the four investigations. The successional law of algal function groups in different seasons could be summarized as follow:MP+P+D+B in March, MP+J+P+D+B in June, MP+J+P+D+B+LO+Y in September, MP+J+D+Y in December. PCA (principal component analysis) was applied to choose the major potential stressors which influenced the habitat of algae by SPSS 13.0, and CCA (canonical correspondence analysis) was used to explore the relationship between algal function groups and major environmental parameters. It is indicated from the results that water temperature (T), pH, dissolved oxygen (DO), Chemical Oxygen Demand (CODCr), ammonia nitrogen (NH3-N) and total phosphorus (TP) were the most important factors influencing the distribution of algal function groups across the 11sampling sections.
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Received: 02 June 2016
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