IHB OpenIR  > 淡水生态学研究中心  > 期刊论文
RAINFALLS ACCELERATE THE DECLINE PROCESS OF MICROCYSTIS (CYANOPHYCEAE) BLOOMS
Wang, Zhicong1,2; Li, Dunhai1; Li, Zhongjie1; Li, DH (reprint author), Chinese Acad Sci, Inst Hydrobiol, 7 Donghu S Rd, Wuhan 430072, Hubei Province, Peoples R China.
2012
Source PublicationFRESENIUS ENVIRONMENTAL BULLETIN
ISSN1018-4619
Volume21Issue:8APages:2145-2152
AbstractIn Lake Chaohu, China, a vertical stratification of water temperature and dissolved oxygen (DO) was observed on sunny days, whereas it was not obvious on rainy days and DO was low in the whole water body. This indicates that rainfall can lead to a vertical convection and a low DO. In this study, we found that the density of small Microcystis colonies (<100 mu m) was higher on rainy day than on sunny days, implying that rainfall had a mechanical impact on large colonies and broke them into small colonies. The measured results of algae collected on sunny day showed that oxygen removal in mucilaginous envelope, mechanical damage, and destruction of gas vesicles could significantly decrease the buoyancy of Microcystis colonies by 27.36 +/- 4.85% (p < 0.01), 45.57 +/- 5.29% (p < 0.01) and 18.23 +/- 3.24% (p < 0.05) in one-way ANOVA, respectively. However, when algae sampled on rainy day were treated with above mentioned three methods, the buoyancy of Microcystis colonies only decreased by 6.72 +/- 2.77% (p > 0.05), 33.37 +/- 4.02% (p < 0.01), and 13.34 +/- 3.58% (p < 0.05) in one-way ANOVA, respectively. These results suggested the rapid decrease in colony buoyancy on rainy days was not only due to the breakage of colonies but also due to the loss of oxygen bubble entrapped in mucilaginous envelope. Under simulated rainy day condition, the low DO in the water significantly decreased the photosynthetic activity, the up-floating velocity, and the growth rate of Microcystis colonies, which suggested that low-oxygen in some areas of lake could damage the photo-system of Microcystis and cause a bloom decline. The reculture of settled Microcystis colonies collected on rainy days showed that the recovery of photosynthetic activity and growth rate were very low, suggesting that most of the settled colonies could not act as seed source for the next bloom even though they were stirred and suspended in the water column after the weather conditions became suitable. Therefore, the physiological inactivity and the settling of Microcystis colonies under frequent heavy rainfall condition are the important reasons for the seasonal, rapid, irreversible collapse of severe algal blooms until the following year.; In Lake Chaohu, China, a vertical stratification of water temperature and dissolved oxygen (DO) was observed on sunny days, whereas it was not obvious on rainy days and DO was low in the whole water body. This indicates that rainfall can lead to a vertical convection and a low DO. In this study, we found that the density of small Microcystis colonies (<100 mu m) was higher on rainy day than on sunny days, implying that rainfall had a mechanical impact on large colonies and broke them into small colonies. The measured results of algae collected on sunny day showed that oxygen removal in mucilaginous envelope, mechanical damage, and destruction of gas vesicles could significantly decrease the buoyancy of Microcystis colonies by 27.36 +/- 4.85% (p < 0.01), 45.57 +/- 5.29% (p < 0.01) and 18.23 +/- 3.24% (p < 0.05) in one-way ANOVA, respectively. However, when algae sampled on rainy day were treated with above mentioned three methods, the buoyancy of Microcystis colonies only decreased by 6.72 +/- 2.77% (p > 0.05), 33.37 +/- 4.02% (p < 0.01), and 13.34 +/- 3.58% (p < 0.05) in one-way ANOVA, respectively. These results suggested the rapid decrease in colony buoyancy on rainy days was not only due to the breakage of colonies but also due to the loss of oxygen bubble entrapped in mucilaginous envelope. Under simulated rainy day condition, the low DO in the water significantly decreased the photosynthetic activity, the up-floating velocity, and the growth rate of Microcystis colonies, which suggested that low-oxygen in some areas of lake could damage the photo-system of Microcystis and cause a bloom decline. The reculture of settled Microcystis colonies collected on rainy days showed that the recovery of photosynthetic activity and growth rate were very low, suggesting that most of the settled colonies could not act as seed source for the next bloom even though they were stirred and suspended in the water column after the weather conditions became suitable. Therefore, the physiological inactivity and the settling of Microcystis colonies under frequent heavy rainfall condition are the important reasons for the seasonal, rapid, irreversible collapse of severe algal blooms until the following year.
SubtypeArticle
KeywordRainfall Microcystis Bloom Decline Buoyancy Particle Size Photosynthetic Activity
Department[Wang, Zhicong; Li, Dunhai; Li, Zhongjie] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei Province, Peoples R China; [Wang, Zhicong] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Funding OrganizationNational Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025] ; National Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025] ; National Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025] ; National Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025]
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000309326100001
WOS KeywordCYANOBACTERIUM MICROCYSTIS ; CHLOROPHYLL FLUORESCENCE ; NITROGEN DYNAMICS ; PHOTOSYSTEM-II ; LAKE CHAOHU ; IN-VIVO ; CHINA ; AERUGINOSA ; SHALLOW ; DAMAGE
Funding OrganizationNational Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025] ; National Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025] ; National Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025] ; National Basic Research and Development Plan [2008CB418002]; National Major Programs of Water Body Pollution Control and Remediation [2009ZX07104-005]; National Natural Science Foundation of China [30830025]
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/17192
Collection淡水生态学研究中心_期刊论文
Corresponding AuthorLi, DH (reprint author), Chinese Acad Sci, Inst Hydrobiol, 7 Donghu S Rd, Wuhan 430072, Hubei Province, Peoples R China.
Affiliation1.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei Province, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Zhicong,Li, Dunhai,Li, Zhongjie,et al. RAINFALLS ACCELERATE THE DECLINE PROCESS OF MICROCYSTIS (CYANOPHYCEAE) BLOOMS[J]. FRESENIUS ENVIRONMENTAL BULLETIN,2012,21(8A):2145-2152.
APA Wang, Zhicong,Li, Dunhai,Li, Zhongjie,&Li, DH .(2012).RAINFALLS ACCELERATE THE DECLINE PROCESS OF MICROCYSTIS (CYANOPHYCEAE) BLOOMS.FRESENIUS ENVIRONMENTAL BULLETIN,21(8A),2145-2152.
MLA Wang, Zhicong,et al."RAINFALLS ACCELERATE THE DECLINE PROCESS OF MICROCYSTIS (CYANOPHYCEAE) BLOOMS".FRESENIUS ENVIRONMENTAL BULLETIN 21.8A(2012):2145-2152.
Files in This Item:
File Name/Size DocType Version Access License
RAINFALLS ACCELERATE(2000KB) 开放获取--View Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wang, Zhicong]'s Articles
[Li, Dunhai]'s Articles
[Li, Zhongjie]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wang, Zhicong]'s Articles
[Li, Dunhai]'s Articles
[Li, Zhongjie]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wang, Zhicong]'s Articles
[Li, Dunhai]'s Articles
[Li, Zhongjie]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: RAINFALLS ACCELERATE THE DECLINE PROCESS OF MICROCYSTIS (CYANOPHYCEAE) BLOOMS.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.