IHB OpenIR  > 淡水生态学研究中心  > 期刊论文
Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams
Tang, Tao1; Niu, Sophia Qian2; Dudgeon, David3; Tang, T (reprint author), Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China.
2013-02-01
Source PublicationHYDROBIOLOGIA
ISSN0018-8158
Volume703Issue:1Pages:225-237
AbstractWe 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.; 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.
SubtypeArticle
KeywordFlow Reduction Hydro-ecological Relationship Diatoms Morphological Guilds Hierarchical Partitioning Environmental Flow Allocations
Department[Tang, Tao] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China ; [Niu, Sophia Qian] St Louis Univ, Dept Biol, St Louis, MO 63103 USA ; [Dudgeon, David] Univ Hong Kong, Sch Biol Sci, Chair Ecol & Biodivers, Hong Kong, Hong Kong, Peoples R China
DOI10.1007/s10750-012-1362-z
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaMarine & Freshwater Biology
WOS SubjectMarine & Freshwater Biology
WOS IDWOS:000312782000017
WOS KeywordPSEUDOGASTROMYZON-MYERSI BALITORIDAE ; NEW-ZEALAND RIVERS ; CURRENT VELOCITY ; CONSERVATION BIOLOGY ; ENVIRONMENTAL FLOWS ; DIATOM COMMUNITIES ; ECOLOGICAL GUILDS ; SPATIAL-PATTERNS ; PERIPHYTON ; DISTURBANCE
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/19293
Collection淡水生态学研究中心_期刊论文
Corresponding AuthorTang, T (reprint author), Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China.
Affiliation1.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
Recommended Citation
GB/T 7714
Tang, Tao,Niu, Sophia Qian,Dudgeon, David,et al. 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,&Tang, T .(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.
Files in This Item: Download All
File Name/Size DocType Version Access License
Responses of epibent(292KB) 开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Tang, Tao]'s Articles
[Niu, Sophia Qian]'s Articles
[Dudgeon, David]'s Articles
Baidu academic
Similar articles in Baidu academic
[Tang, Tao]'s Articles
[Niu, Sophia Qian]'s Articles
[Dudgeon, David]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Tang, Tao]'s Articles
[Niu, Sophia Qian]'s Articles
[Dudgeon, David]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams.pdf
Format: Adobe PDF
This file does not support browsing at this time
All comments (0)
No comment.
 

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