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题名: Responses of phytoplankton functional groups to simulated winter warming
作者: Dong, Jing1, 2; Zhou, Weicheng1, 3; Song, Lirong1; Li, Genbao1
关键词: Phytoplankton ; functional group ; winter warming ; eutrophication ; responses
刊名: ANNALES DE LIMNOLOGIE-INTERNATIONAL JOURNAL OF LIMNOLOGY
发表日期: 2015
DOI: 10.1051/limn/2015014
卷: 51, 期:3, 页:199-210
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Limnology
研究领域[WOS]: Marine & Freshwater Biology
英文摘要: We investigated the seasonal dynamics of phytoplankton functional groups and the relevant environmental factors (water temperature, total nitrogen content, total phosphorous content and water transparency) in Dianchi Lake, China. We also examined the growth rates and physiological characteristics of representative species in laboratory cultures. In the field experiment, five dominant functional groups, including M (mainly consisted of Microcystis aeruginosa; Microcystis wesenbergii and Microcystis flos-aquae), H1(mainly consisted of Aphanizomenon flos-aquae), J (mainly consisted of Scenedesmus; Pediastrum and Coelastrum), F (mainly consisted of Oocystis and Kirchneriella) and P (mainly consisted of Melosira), were determined. Groups M and J were prevalent throughout the year and comprised more than 90% of the total biomass. Group M was prevalent at a relatively high temperature in summer and autumn; by contrast, group J was dominant at low temperature in winter and early spring. Co-cultivation laboratory experiments revealed that the biomass and the density of Microcystis sp., which is the representative species of the functional group M, were higher at 18 degrees C than at 13 degrees C. Conversely, the density and the biomass of the representative species of the functional group J (consisted of Pediastrum duplex, Coelastrum microporum and Scenedesmus obliquus) were higher at 13 degrees C than at 18 degrees C. At low temperatures, group M (Microcystis spp.) cannot successfully survive and grow at low temperatures, exhibiting various stress responses, such as inhibited photosynthetic activities and reduced phosphorous utilization. However, low temperature increased soluble carbohydrate contents of Microcystis, which favored the fast development of Microcystis, once the temperature warmed. Currently, climate warming is occurring in the Dianchi Lake basin; thus, future climate warming in winter (+/- 5 degrees C) may compromise the advantages of group J and promote the abundance of group M. The water transparency, dissolved oxygen and biodiversity in the lake would be further reduced. Furthermore, the increased microcystin and odor produced by Microcystis would considerably threaten the food web structure and lake ecosystem functions.
关键词[WOS]: CLIMATE-CHANGE ; CYANOBACTERIAL BLOOMS ; LONG-TERM ; SHALLOW LAKES ; NUTRIENT LOAD ; TROPHIC STATE ; TEMPERATURE ; GROWTH ; MICROCYSTIS ; PHENOLOGY
语种: 英语
项目资助者: National Natural Science Foundation of China(31370472) ; State Key Laboratory of Freshwater Ecology and Biotechnology(2014FBZ01)
WOS记录号: WOS:000366177800002
ISSN号: 0003-4088
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/27454
Appears in Collections:藻类生物学及应用研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2.Henan Normal Univ, Coll Fisheries, Xinxiang 453007, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
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