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| Impact of zinc and iron on phytoplankton community structure during recruitment:A case study in Lake Xuanwu, Nanjing |
| Received:August 28, 2015 |
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| KeyWord:phytoplankton;recruitment;metal;community structure;Fv/Fm |
| Author Name | Affiliation | E-mail | | TENG Yi-li | College of Environment, Hohai University, Nanjing 210098, China
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China | | | WANG Pei-fang | College of Environment, Hohai University, Nanjing 210098, China
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China | pfwang2005@hhu.edu.cn | | REN Ling-xiao | College of Environment, Hohai University, Nanjing 210098, China
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China | | | WANG Chao | College of Environment, Hohai University, Nanjing 210098, China
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China | | | QIAN Jin | College of Environment, Hohai University, Nanjing 210098, China
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China | | | LIU Jia-jia | College of Environment, Hohai University, Nanjing 210098, China
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China | |
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| Abstract: |
| Many studies have focused on the effects of temperature, light and dissolved oxygen on the growth of phytoplankton. However, the understanding of metal effects on phytoplankton during recruitment remains unclear. In the present study, water samples taken from Xuanwu Lake in December have been used to clarify the relationship between metal concentration and community structure change during phytoplankton recovery process. The initial zinc(0, 3.25×10-4, 3.25×10-3, 3.25×10-2 mg·L-1) and iron concentrations(0, 2.80×10-4, 2.80×10-3, 2.80×10-2 mg·L-1) were employed in cultivation experiment. Results showed that when zinc concentration was higher than 3.25×10-3 mg·L-1, the recruitment of blue algae was obviously inhibited and the growth of green algae and diatoms was reduced. The Fv/Fm values of these three algae were 0.4, 0.3 and 0,respectively. Similar results were also observed when iron concentration was over 2.80×10-4 mg·L-1. The recruitment of blue algae was inhibited. Fv/Fm values of blue algae, green algae and diatoms were reduced to 0.45, 0.33 and 0.07, respectively. It can be concluded that recruited phytoplankton was dominated by Microcystis of Cyanophyta, followed by Scenedesmus under high iron concentrations, while its dominant species was Scenedesmus, followed by Chlorella and Microcystis under zinc stresses. |
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