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Article: Scales of spatiotemporal variability in macroinvertebrate abundance and diversity in monsoonal streams: Detecting environmental change

TitleScales of spatiotemporal variability in macroinvertebrate abundance and diversity in monsoonal streams: Detecting environmental change
Authors
KeywordsBiomonitoring
Disturbance
Hong kong
Inter-annual variation
Seasonality
Spate
Issue Date2011
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/FWB
Citation
Freshwater Biology, 2011, v. 56 n. 6, p. 1193-1208 How to Cite?
Abstract1.We quantified spatial and temporal variability in benthic macroinvertebrate species richness, diversity and abundance in six unpolluted streams in monsoonal Hong Kong at different scales using a nested sampling design. The spatial scales were regions, stream sites and stream sections within sites; temporal scales were years (1997-99), seasons (dry versus wet seasons) and days within seasons. 2.Spatiotemporal variability in total abundance and species richness was greater during the wet season, especially at small scales, and tended to obscure site- and region-scale differences, which were more conspicuous during the dry season. Total abundance and richness were greater in the dry season, reflecting the effects of spate-induced disturbance during the wet season. Species diversity showed little variation at the seasonal scale, but variability at the site scale was apparent during both seasons. 3.Despite marked variations in monsoonal rainfall, inter-year differences in macroinvertebrate richness and abundance at the site scale during the wet season were minor. Inter-year differences were only evident during the dry season when streams were at base flow and biotic interactions may structure assemblages. 4.Small-scale patchiness within riffles was the dominant spatial scale of variation in macroinvertebrate richness, total abundance and densities of common species, although site or region was important for some species. The proportion of total variance contributed by small-scale spatial variability increased during the dry season, whereas temporal variability associated with days was greater during the wet season. 5.The observed patterns of spatiotemporal variation have implications for detection of environmental change or biomonitoring using macroinvertebrate indicators in streams in monsoonal regions. Sampling should be confined to the dry season or, in cases where more resources are available, make use of data from both dry and wet seasons. Sampling in more than one dry season is required to avoid the potentially confounding effects of inter-year variation, although variability at that scale was relatively small. © 2011 Blackwell Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/140922
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
ASLL
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. We are particularly grateful to Lisandro Benedetti-Cecchi for his advice and clarification on nested designs and ANOVA models during the initial stages of this study.

References

 

DC FieldValueLanguage
dc.contributor.authorLeung, ASLen_HK
dc.contributor.authorDudgeon, Den_HK
dc.date.accessioned2011-09-23T06:21:27Z-
dc.date.available2011-09-23T06:21:27Z-
dc.date.issued2011en_HK
dc.identifier.citationFreshwater Biology, 2011, v. 56 n. 6, p. 1193-1208en_HK
dc.identifier.issn0046-5070en_HK
dc.identifier.urihttp://hdl.handle.net/10722/140922-
dc.description.abstract1.We quantified spatial and temporal variability in benthic macroinvertebrate species richness, diversity and abundance in six unpolluted streams in monsoonal Hong Kong at different scales using a nested sampling design. The spatial scales were regions, stream sites and stream sections within sites; temporal scales were years (1997-99), seasons (dry versus wet seasons) and days within seasons. 2.Spatiotemporal variability in total abundance and species richness was greater during the wet season, especially at small scales, and tended to obscure site- and region-scale differences, which were more conspicuous during the dry season. Total abundance and richness were greater in the dry season, reflecting the effects of spate-induced disturbance during the wet season. Species diversity showed little variation at the seasonal scale, but variability at the site scale was apparent during both seasons. 3.Despite marked variations in monsoonal rainfall, inter-year differences in macroinvertebrate richness and abundance at the site scale during the wet season were minor. Inter-year differences were only evident during the dry season when streams were at base flow and biotic interactions may structure assemblages. 4.Small-scale patchiness within riffles was the dominant spatial scale of variation in macroinvertebrate richness, total abundance and densities of common species, although site or region was important for some species. The proportion of total variance contributed by small-scale spatial variability increased during the dry season, whereas temporal variability associated with days was greater during the wet season. 5.The observed patterns of spatiotemporal variation have implications for detection of environmental change or biomonitoring using macroinvertebrate indicators in streams in monsoonal regions. Sampling should be confined to the dry season or, in cases where more resources are available, make use of data from both dry and wet seasons. Sampling in more than one dry season is required to avoid the potentially confounding effects of inter-year variation, although variability at that scale was relatively small. © 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.com-
dc.subjectBiomonitoringen_HK
dc.subjectDisturbanceen_HK
dc.subjectHong kongen_HK
dc.subjectInter-annual variationen_HK
dc.subjectSeasonalityen_HK
dc.subjectSpateen_HK
dc.titleScales of spatiotemporal variability in macroinvertebrate abundance and diversity in monsoonal streams: Detecting environmental changeen_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.1365-2427.2010.02556.xen_HK
dc.identifier.scopuseid_2-s2.0-79954939560en_HK
dc.identifier.hkuros194866en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79954939560&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume56en_HK
dc.identifier.issue6en_HK
dc.identifier.spage1193en_HK
dc.identifier.epage1208en_HK
dc.identifier.eissn1365-2427-
dc.identifier.isiWOS:000289640800014-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLeung, ASL=37122204100en_HK
dc.identifier.scopusauthoridDudgeon, D=7006559840en_HK
dc.identifier.citeulike9176172-

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