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Article: Scales of spatiotemporal variation in macroinvertebrate assemblage structure in monsoonal streams: The importance of season

TitleScales of spatiotemporal variation in macroinvertebrate assemblage structure in monsoonal streams: The importance of season
Authors
KeywordsDisturbance
Harsh-benign hypothesis
Hong Kong
Seasonality
Spate
Issue Date2012
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/FWB
Citation
Freshwater Biology, 2012, v. 57 n. 1, p. 218-231 How to Cite?
AbstractWe assessed the relative importance of different scales of spatial and temporal variability on benthic macroinvertebrate assemblage structure in six unpolluted streams in monsoonal Hong Kong using ordination and complementary multivariate analyses. The spatial scales were regions, sites (streams) and sections (riffles) within sites. The temporal scales were years (three, including one with unusually high rainfall), seasons (dry versus wet) and days within seasons. Significant differences in assemblage structure were manifested at all temporal scales. Those at the site scale were most obvious, whereas demarcation of assemblage structure at the section (riffle) scale was smaller, and there was no significant regional differentiation in assemblage structure. Seasonal variability in assemblage structure was greater than that among years or days. Inter-year differences in assemblage structure were recorded at all sites, and were noted among all years at some sites but not at others. They were recorded more frequently during the dry season, although their occurrence (in pair-wise comparisons between years) appeared to be related to differences in the monsoonal (wet season) rainfall. Seasonal differences in assemblage structure were strongly evident at all sites. Inter-site differences were more apparent during the dry season when local (site-scale) influences on assemblages were stronger. By contrast, wet-season samples were more variable because of spate-induced disturbance, and inter-site differentiation was less distinct. Differences among days at all sites were relatively minor, but shifts attributable to repeated spate-induced disturbance were evident at some sites during the wet season. Differences at the section scale were recorded more frequently during the dry season, when the extent of within-site variability among sections was higher, reflecting increased patchiness within sections resulting from increased substratum heterogeneity and/or greater intensity of biotic interactions. Seasonal shifts in macroinvertebrate assemblage structure at a variety of scales in Hong Kong streams are likely to be attributable to monsoonal rains affecting the relative intensity of abiotic disturbance and biotic interactions in accordance with the harsh-benign hypothesis. © 2011 Blackwell Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/147038
ISSN
2015 Impact Factor: 2.933
2015 SCImago Journal Rankings: 1.574
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong Kong Special Administrative Region, China[HKU] 190/95M
Funding Information:

This study was partially funded by a grant from the Research Grants Council of Hong Kong Special Administrative Region, China (Project No. [HKU] 190/95M) awarded to Gray Williams and DD, which supported ASLL during his Ph.D. Maggie Verrall and especially Lily Ng provided invaluable laboratory and field assistance, and the manuscript was improved by the suggestions of two anonymous reviewers.

References

 

DC FieldValueLanguage
dc.contributor.authorLeung, ASLen_HK
dc.contributor.authorLi, AOYen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2012-05-23T05:54:14Z-
dc.date.available2012-05-23T05:54:14Z-
dc.date.issued2012en_HK
dc.identifier.citationFreshwater Biology, 2012, v. 57 n. 1, p. 218-231en_HK
dc.identifier.issn0046-5070en_HK
dc.identifier.urihttp://hdl.handle.net/10722/147038-
dc.description.abstractWe assessed the relative importance of different scales of spatial and temporal variability on benthic macroinvertebrate assemblage structure in six unpolluted streams in monsoonal Hong Kong using ordination and complementary multivariate analyses. The spatial scales were regions, sites (streams) and sections (riffles) within sites. The temporal scales were years (three, including one with unusually high rainfall), seasons (dry versus wet) and days within seasons. Significant differences in assemblage structure were manifested at all temporal scales. Those at the site scale were most obvious, whereas demarcation of assemblage structure at the section (riffle) scale was smaller, and there was no significant regional differentiation in assemblage structure. Seasonal variability in assemblage structure was greater than that among years or days. Inter-year differences in assemblage structure were recorded at all sites, and were noted among all years at some sites but not at others. They were recorded more frequently during the dry season, although their occurrence (in pair-wise comparisons between years) appeared to be related to differences in the monsoonal (wet season) rainfall. Seasonal differences in assemblage structure were strongly evident at all sites. Inter-site differences were more apparent during the dry season when local (site-scale) influences on assemblages were stronger. By contrast, wet-season samples were more variable because of spate-induced disturbance, and inter-site differentiation was less distinct. Differences among days at all sites were relatively minor, but shifts attributable to repeated spate-induced disturbance were evident at some sites during the wet season. Differences at the section scale were recorded more frequently during the dry season, when the extent of within-site variability among sections was higher, reflecting increased patchiness within sections resulting from increased substratum heterogeneity and/or greater intensity of biotic interactions. Seasonal shifts in macroinvertebrate assemblage structure at a variety of scales in Hong Kong streams are likely to be attributable to monsoonal rains affecting the relative intensity of abiotic disturbance and biotic interactions in accordance with the harsh-benign hypothesis. © 2011 Blackwell Publishing Ltd.en_HK
dc.languageengen_US
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/FWBen_HK
dc.relation.ispartofFreshwater Biologyen_HK
dc.rightsThe definitive version is available at www.blackwell-synergy.comen_US
dc.subjectDisturbanceen_HK
dc.subjectHarsh-benign hypothesisen_HK
dc.subjectHong Kongen_HK
dc.subjectSeasonalityen_HK
dc.subjectSpateen_HK
dc.titleScales of spatiotemporal variation in macroinvertebrate assemblage structure in monsoonal streams: The importance of seasonen_HK
dc.typeArticleen_HK
dc.identifier.emailDudgeon, D: ddudgeon@hku.hken_HK
dc.identifier.authorityDudgeon, D=rp00691en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2427.2011.02707.xen_HK
dc.identifier.scopuseid_2-s2.0-82455199277en_HK
dc.identifier.hkuros199554en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-82455199277&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume57en_HK
dc.identifier.issue1en_HK
dc.identifier.spage218en_HK
dc.identifier.epage231en_HK
dc.identifier.isiWOS:000297468100018-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLeung, ASL=37122204100en_HK
dc.identifier.scopusauthoridLi, AOY=24773824300en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK

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