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Article: Spatial and seasonal variations in benthic algal assemblages in streams in monsoonal Hong Kong

TitleSpatial and seasonal variations in benthic algal assemblages in streams in monsoonal Hong Kong
Authors
KeywordsBalitoridae
Cyanobacteria
Diatoms
Grazers
Periphyton
Spates
Issue Date2009
PublisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0018-8158
Citation
Hydrobiologia, 2009, v. 632 n. 1, p. 189-200 How to Cite?
AbstractSamples from stone surfaces were collected in pools within four unpolluted hillstreams (two shaded and two unshaded) in monsoonal Hong Kong (lat. 23°N) to elucidate the extent of spatial (within and among streams) and temporal (seasonal) variations in algal biomass and assemblage composition. Sampling continued for over 12 months, incorporating the dry season when streams were at baseflow, and the wet season when spates were frequent. We anticipated that algal biomass would be lower in shaded streams and during the wet season, with associated seasonal differences in assemblage composition or relative abundance of different growth forms (e.g. erect versus prostrate). Benthic chlorophyll a (a proxy for algal biomass) varied among streams from an annual mean of 11.0-22.3 mg m -2. Dry-season standing stocks were 18% higher than during the wet season when spate-induced disturbance reduced algal standing stocks. Algal biomass varied significantly at the stream scale, but not at the pool scale, and was lower in unshaded streams, where standing stocks may have been limited by high densities of algivorous balitorid loaches (mainly Pseudogastromyzon myersi). An overriding effect of grazers on algal biomass could also have reduced variations resulting from spate-induced disturbance. Significant differences in assemblage composition among streams, which were dominated by diatoms and cyanobacteria (totally 82 taxa) were not systematically related to shading conditions. Seasonal variations in algal assemblages were statistically significant but rather minor, and did not involve major shifts in composition or growth form caused by spate-induced disturbance. The abundance of filamentous cyanobacteria in all the streams may have been due to 'gardening' by balitorid loaches that removed erect or stalked diatoms and favoured cyanobacteria that persist through basal regeneration of filaments. This explanation requires validation through manipulative experiments. © Springer Science+Business Media B.V. 2009.
Persistent Identifierhttp://hdl.handle.net/10722/128496
ISSN
2015 Impact Factor: 2.051
2015 SCImago Journal Rankings: 1.043
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong Kong Special Administrative Region, China[HKU] 7509/06M
Funding Information:

The study described in this article was partially supported by a grant from the Research Grants Council of Hong Kong Special Administrative Region, China ( Project No. [HKU] 7509/06M), and by a postgraduate studentship awarded to Grace Y. Yang during her M. Phil. studies at the University of Hong Kong. We thank Lily C. Y. Ng for technical support, and Aggie O.Y. Li and Dr Nancy Karraker for their comments on a manuscript draft. The submitted manuscript was improved by incorporation of suggestions from Dr Randy Fuller, Dr L. M. Bini and an anonymous reviewer.

References

 

DC FieldValueLanguage
dc.contributor.authorYang, GYen_HK
dc.contributor.authorTang, Ten_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2010-10-31T14:31:41Z-
dc.date.available2010-10-31T14:31:41Z-
dc.date.issued2009en_HK
dc.identifier.citationHydrobiologia, 2009, v. 632 n. 1, p. 189-200en_HK
dc.identifier.issn0018-8158en_HK
dc.identifier.urihttp://hdl.handle.net/10722/128496-
dc.description.abstractSamples from stone surfaces were collected in pools within four unpolluted hillstreams (two shaded and two unshaded) in monsoonal Hong Kong (lat. 23°N) to elucidate the extent of spatial (within and among streams) and temporal (seasonal) variations in algal biomass and assemblage composition. Sampling continued for over 12 months, incorporating the dry season when streams were at baseflow, and the wet season when spates were frequent. We anticipated that algal biomass would be lower in shaded streams and during the wet season, with associated seasonal differences in assemblage composition or relative abundance of different growth forms (e.g. erect versus prostrate). Benthic chlorophyll a (a proxy for algal biomass) varied among streams from an annual mean of 11.0-22.3 mg m -2. Dry-season standing stocks were 18% higher than during the wet season when spate-induced disturbance reduced algal standing stocks. Algal biomass varied significantly at the stream scale, but not at the pool scale, and was lower in unshaded streams, where standing stocks may have been limited by high densities of algivorous balitorid loaches (mainly Pseudogastromyzon myersi). An overriding effect of grazers on algal biomass could also have reduced variations resulting from spate-induced disturbance. Significant differences in assemblage composition among streams, which were dominated by diatoms and cyanobacteria (totally 82 taxa) were not systematically related to shading conditions. Seasonal variations in algal assemblages were statistically significant but rather minor, and did not involve major shifts in composition or growth form caused by spate-induced disturbance. The abundance of filamentous cyanobacteria in all the streams may have been due to 'gardening' by balitorid loaches that removed erect or stalked diatoms and favoured cyanobacteria that persist through basal regeneration of filaments. This explanation requires validation through manipulative experiments. © Springer Science+Business Media B.V. 2009.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0018-8158en_HK
dc.relation.ispartofHydrobiologiaen_HK
dc.rightsThe original publication is available at www.springerlink.com-
dc.subjectBalitoridaeen_HK
dc.subjectCyanobacteriaen_HK
dc.subjectDiatomsen_HK
dc.subjectGrazersen_HK
dc.subjectPeriphytonen_HK
dc.subjectSpatesen_HK
dc.titleSpatial and seasonal variations in benthic algal assemblages in streams in monsoonal Hong Kongen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0018-8158&volume=632&issue=1&spage=189&epage=200&date=2009&atitle=Spatial+and+seasonal+variations+in+benthic+algal+assemblages+in+streams+in+monsoonal+Hong+Kongen_HK
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s10750-009-9838-1en_HK
dc.identifier.scopuseid_2-s2.0-70349995986en_HK
dc.identifier.hkuros179034en_HK
dc.identifier.hkuros163364-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70349995986&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume632en_HK
dc.identifier.issue1en_HK
dc.identifier.spage189en_HK
dc.identifier.epage200en_HK
dc.identifier.isiWOS:000268728500012-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridYang, GY=26645276500en_HK
dc.identifier.scopusauthoridTang, T=50562143800en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.citeulike5046848-

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