Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams

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	Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams
	Tang, Tao 1; Niu, Sophia Qian 2; Dudgeon, David 3
刊名	HYDROBIOLOGIA
	2013-02-01
卷号	703 期号:1 页码:225-237
关键词	Flow reduction Hydro-ecological relationship Diatoms Morphological guilds Hierarchical partitioning Environmental flow allocations
ISSN号	0018-8158
通讯作者	Tang, T (reprint author), Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China.
中文摘要	We studied the effects of flow reduction on epibenthic algal assemblages by comparing up- and down-stream reaches of ten Hong Kong streams subject to different degrees of water abstraction during 2007-2008. Downstream discharge declined by 71 and 54% during the wet and dry seasons, respectively. Algal responses varied seasonally and according to morphological guild and reflecting reductions in discharge and current velocity, or changes in total nitrogen and phosphate, or their combined effects. Significant inter-reach assemblage differences were observed during the both seasons, but wet-season assemblage structure was not directly influenced by any flow-related variable. During the dry season, scouring-tolerant prostrate/adnate diatoms (especially Achnanthes, Cocconeis) were relatively abundant upstream, whereas intolerant stalked (Eunotia, Gomphonema) and mobile diatoms were more numerous downstream. Both low- and high-profile (erect diatoms, Chamaesiphon, Calothrix) guilds were sensitive to changes in nutrients. Low-flow conditions downstream, surprisingly, enhanced algal diversity, and richness. Based on the linear response of Cocconeis (mainly C. placentula) to discharge reduction, we recommend that > 65% of dry-season discharge should be maintained in downstream reaches in order to sustain near-natural algal assemblages; 32% of discharge is required to avoid substantial alterations in assemblage structure.
英文摘要	We studied the effects of flow reduction on epibenthic algal assemblages by comparing up- and down-stream reaches of ten Hong Kong streams subject to different degrees of water abstraction during 2007-2008. Downstream discharge declined by 71 and 54% during the wet and dry seasons, respectively. Algal responses varied seasonally and according to morphological guild and reflecting reductions in discharge and current velocity, or changes in total nitrogen and phosphate, or their combined effects. Significant inter-reach assemblage differences were observed during the both seasons, but wet-season assemblage structure was not directly influenced by any flow-related variable. During the dry season, scouring-tolerant prostrate/adnate diatoms (especially Achnanthes, Cocconeis) were relatively abundant upstream, whereas intolerant stalked (Eunotia, Gomphonema) and mobile diatoms were more numerous downstream. Both low- and high-profile (erect diatoms, Chamaesiphon, Calothrix) guilds were sensitive to changes in nutrients. Low-flow conditions downstream, surprisingly, enhanced algal diversity, and richness. Based on the linear response of Cocconeis (mainly C. placentula) to discharge reduction, we recommend that > 65% of dry-season discharge should be maintained in downstream reaches in order to sustain near-natural algal assemblages; 32% of discharge is required to avoid substantial alterations in assemblage structure.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Marine & Freshwater Biology
研究领域[WOS]	Marine & Freshwater Biology
关键词[WOS]	PSEUDOGASTROMYZON-MYERSI BALITORIDAE ; NEW-ZEALAND RIVERS ; CURRENT VELOCITY ; CONSERVATION BIOLOGY ; ENVIRONMENTAL FLOWS ; DIATOM COMMUNITIES ; ECOLOGICAL GUILDS ; SPATIAL-PATTERNS ; PERIPHYTON ; DISTURBANCE
收录类别	SCI
语种	英语
WOS记录号	WOS:000312782000017
公开日期	2013-10-31
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/342005/19293]
专题	水生生物研究所_淡水生态学研究中心_期刊论文
作者单位	1.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China 2.St Louis Univ, Dept Biol, St Louis, MO 63103 USA 3.Univ Hong Kong, Sch Biol Sci, Chair Ecol & Biodivers, Hong Kong, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Tang, Tao,Niu, Sophia Qian,Dudgeon, David. Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams[J]. HYDROBIOLOGIA,2013,703(1):225-237.
APA	Tang, Tao,Niu, Sophia Qian,&Dudgeon, David.(2013).Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams.HYDROBIOLOGIA,703(1),225-237.
MLA	Tang, Tao,et al."Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams".HYDROBIOLOGIA 703.1(2013):225-237.