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

TitleResponses of epibenthic algal assemblages to water abstraction in Hong Kong streams
Authors
KeywordsDiatoms
Environmental Flow Allocations
Flow Reduction
Hierarchical Partitioning
Hydro-Ecological Relationship
Morphological Guilds
Issue Date2013
PublisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0018-8158
Citation
Hydrobiologia, 2013, v. 703 n. 1, p. 225-237 How to Cite?
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. © 2012 Springer Science+Business Media Dordrecht.
Persistent Identifierhttp://hdl.handle.net/10722/179332
ISSN
2015 Impact Factor: 2.051
2015 SCImago Journal Rankings: 1.043
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTang, Ten_US
dc.contributor.authorNiu, SQen_US
dc.contributor.authorDudgeon, Den_US
dc.date.accessioned2012-12-19T09:54:16Z-
dc.date.available2012-12-19T09:54:16Z-
dc.date.issued2013en_US
dc.identifier.citationHydrobiologia, 2013, v. 703 n. 1, p. 225-237en_US
dc.identifier.issn0018-8158en_US
dc.identifier.urihttp://hdl.handle.net/10722/179332-
dc.description.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. © 2012 Springer Science+Business Media Dordrecht.en_US
dc.languageengen_US
dc.publisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0018-8158en_US
dc.relation.ispartofHydrobiologiaen_US
dc.subjectDiatomsen_US
dc.subjectEnvironmental Flow Allocationsen_US
dc.subjectFlow Reductionen_US
dc.subjectHierarchical Partitioningen_US
dc.subjectHydro-Ecological Relationshipen_US
dc.subjectMorphological Guildsen_US
dc.titleResponses of epibenthic algal assemblages to water abstraction in Hong Kong streamsen_US
dc.typeArticleen_US
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_US
dc.identifier.authorityDudgeon, D=rp00691en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1007/s10750-012-1362-zen_US
dc.identifier.scopuseid_2-s2.0-84871443458en_US
dc.identifier.hkuros215540-
dc.identifier.spage225en_US
dc.identifier.epage237en_US
dc.identifier.isiWOS:000312782000017-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridTang, T=50562143800en_US
dc.identifier.scopusauthoridNiu, SQ=55353124600en_US
dc.identifier.scopusauthoridDudgeon, D=7006559840en_US
dc.identifier.citeulike11620753-

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