- KOREAN
- P-ISSN2287-8327
- E-ISSN2288-1220
- SCOPUS, KCI
ISSN : 2287-8327
Green algae dominance quickly switches to cyanobacteria dominance after nutrient enrichment in greenhouse with high temperature
Xingguo Liu1 (Key Laboratory of Fishery Equipment and)
Boqiang Qin (State Key Laboratory of Lake Science and)
Zhaojun Gu (Key Laboratory of Fishery Equipment and)
Hao Xu (Key Laboratory of Fishery Equipment and)
Hao Zhu (Key Laboratory of Fishery Equipment and)
Guofeng Cheng (Key Laboratory of Fishery Equipment and)
Huang Liu (Key Laboratory of Fishery Equipment and)
Abstract
In order to understand the mechanisms of conversion between different algal dominance, an experiment was performed in a greenhouse from 22 June to 10 July 2011. The experiment included a treatment group subjected to three instances of nutrient enrichment and a control with no nutrient enrichment. The initial water was dominated by Ankistrodesmus of Chlorophyta. The average water temperature at 08:30 h and 14:00 h during the experiment was 31.6°C and 34.6°C, respec¬tively. The results showed that the total nitrogen (TN), total phosphorus (TP), dissolved total nitrogen (DTN), dissolved total phosphorus (DTP), and soluble reactive phosphorus (SRP) concentrations in the treatment were significantly higher than in the control (P < 0.05). However, the TN/TP and DTN/DTP in the control was higher than in the treatment (P < 0.05). The dominant algae in the control did not change during the experiment, while the dominant algae in the treat¬ment switched to Planktothrix of Cyanophyta on day 9. The chlorophyll a (Chl-a), wet weight of all algae, wet weight of Cyanophyta, and percentage of Cyanophyta in the control were all significantly lower than in the treatment (P < 0.05). Amounts of zooplankton, especially rotifers, were present at the end of the experimental period. The density of rotifers between the control and treatment was not significantly different (P > 0.05), while the copepod density in the treatment was higher than in the control (P < 0.05). We conclude that green algae dominance quickly switches to cyanobacteria dominance after nutrient enrichment in a greenhouse with elevated temperature
- keywords
- algal switch, chlorophyta dominance, cyanophyta dominance, high water temperature, nitrogen and phos-phorus, zooplankton
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