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Article: The influence of flow and season upon leaf-litter breakdown in monsoonal Hong Kong streams

TitleThe influence of flow and season upon leaf-litter breakdown in monsoonal Hong Kong streams
Authors
KeywordsBrotia
Discharge
Ecosystem function
Liquidambar
Shredders
Water extraction
Issue Date2011
PublisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0018-8158
Citation
Hydrobiologia, 2011, v. 663 n. 1, p. 205-215 How to Cite?
AbstractWe investigated the effects of water extraction and flow regime on leaf litter breakdown in 10 Hong Kong streams experiencing varying degrees of extraction: five with severe extraction ([85% downstream flow removed), four with moderate extraction (20-85% removed), and one without extraction (*0% removed). Breakdown rates, macroinvertebrate assemblages and nutrients were compared in upstream (reference) reaches and downstream reaches with reduced flow in each stream during highflow (wet season) and low-flow (dry season) conditions to determine whether responses to flow were influenced by Hong Kong's monsoonal climate. Litter breakdown was slower in downstream reaches during the wet season, and discharge was the main determinant of breakdown rate in both reaches across the 10 study streams. In contrast, inter-reach differences in breakdown during the dry season were small and unrelated to flow. Instead, breakdown rates among streams were influenced by the abundance of detritivorous shredders and chironomids (Chironominae), as well as phosphate concentrations, indicating the importance of biological processing of litter under low-flow conditions. Although litter breakdown rates appear to offer a promising functional indicator of flow-reduction impacts during the wet season, the pattern seen reflected the physical effects of flow rather than any underlying biological processes, and the lack of response to flow reduction during the dry season was notable. © The Author(s) 2010.
Persistent Identifierhttp://hdl.handle.net/10722/144963
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
University of Hong Kong
Funding Information:

The work 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 Sophia Q. Niu during her M.Phil. studies at the University of Hong Kong. We thank Dr Nick Bond, Aggie O.Y. Li, Dr Brendan McKie, and an anonymous reviewer for their constructive comments on the manuscript. Our thanks extend to Eric Westhus and Dr Gerardo Camilo, for their advice on statistical analyses. Special thanks go to Lily C.Y. Ng for her technical support.

References

 

DC FieldValueLanguage
dc.contributor.authorNiu, SQen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2012-02-21T05:42:36Z-
dc.date.available2012-02-21T05:42:36Z-
dc.date.issued2011en_HK
dc.identifier.citationHydrobiologia, 2011, v. 663 n. 1, p. 205-215en_HK
dc.identifier.issn0018-8158en_HK
dc.identifier.urihttp://hdl.handle.net/10722/144963-
dc.description.abstractWe investigated the effects of water extraction and flow regime on leaf litter breakdown in 10 Hong Kong streams experiencing varying degrees of extraction: five with severe extraction ([85% downstream flow removed), four with moderate extraction (20-85% removed), and one without extraction (*0% removed). Breakdown rates, macroinvertebrate assemblages and nutrients were compared in upstream (reference) reaches and downstream reaches with reduced flow in each stream during highflow (wet season) and low-flow (dry season) conditions to determine whether responses to flow were influenced by Hong Kong's monsoonal climate. Litter breakdown was slower in downstream reaches during the wet season, and discharge was the main determinant of breakdown rate in both reaches across the 10 study streams. In contrast, inter-reach differences in breakdown during the dry season were small and unrelated to flow. Instead, breakdown rates among streams were influenced by the abundance of detritivorous shredders and chironomids (Chironominae), as well as phosphate concentrations, indicating the importance of biological processing of litter under low-flow conditions. Although litter breakdown rates appear to offer a promising functional indicator of flow-reduction impacts during the wet season, the pattern seen reflected the physical effects of flow rather than any underlying biological processes, and the lack of response to flow reduction during the dry season was notable. © The Author(s) 2010.en_HK
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_HK
dc.relation.ispartofHydrobiologiaen_HK
dc.rightsThe Author(s)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.subjectBrotiaen_HK
dc.subjectDischargeen_HK
dc.subjectEcosystem functionen_HK
dc.subjectLiquidambaren_HK
dc.subjectShreddersen_HK
dc.subjectWater extractionen_HK
dc.titleThe influence of flow and season upon leaf-litter breakdown in monsoonal Hong Kong streamsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4551/resserv?sid=springerlink&genre=article&atitle=The influence of flow and season upon leaf-litter breakdown in monsoonal Hong Kong streams&title=Hydrobiologia&issn=00188158&date=2011-03-01&volume=663&issue=1& spage=205&authors=Sophia Q. Niu, David Dudgeonen_US
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1007/s10750-010-0573-4en_HK
dc.identifier.scopuseid_2-s2.0-79959788235en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79959788235&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume663en_HK
dc.identifier.issue1en_HK
dc.identifier.spage205en_HK
dc.identifier.epage215en_HK
dc.identifier.eissn1573-5117en_US
dc.identifier.isiWOS:000286393300014-
dc.publisher.placeNetherlandsen_HK
dc.description.otherSpringer Open Choice, 21 Feb 2012en_US
dc.identifier.scopusauthoridNiu, SQ=36671762700en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.citeulike8667969-

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