Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/1582
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dc.contributor.authorBoulton, Andrew Johnen
dc.contributor.authorMarmonier, Pen
dc.contributor.authorSarriquet, P-E Xen
dc.date.accessioned2009-05-15T14:57:00Z-
dc.date.issued2007-
dc.identifier.citationRiver Research and Applications, 23(6), p. 579-594en
dc.identifier.issn1535-1467en
dc.identifier.issn1535-1459en
dc.identifier.urihttps://hdl.handle.net/1959.11/1582-
dc.description.abstractMany streams of southwestern Australia have become secondarily saline through land clearance and other human activities in their catchments. Elevated salinities impact on aquatic biota and ecological processes of surface streams but little is known of the effects on the diversity and community composition of hyporheic (subsurface) invertebrates occupying the saturated sediments where surface and groundwaters exchange. We hypothesized that biodiversity of hyporheic invertebrates would decline with increasing salinity, especially where saline groundwater upwelled into the surface stream. We also predicted changes in community composition associated with salinity and direction of vertical hydrological exchange. Water and hyporheic invertebrates were sampled from downwelling and upwelling zones of 13 streams in southwestern Australia ranging in median surface water salinity from 0.27 to 17.86 g L⁻¹. Overall, taxa richness of hyporheic invertebrates was uncorrelated with salinity but, surprisingly, correlated positively with the salinity of upwelling water. However, when the sites were divided into 'fresh' (<3 g L⁻¹) and 'mesosaline' (>3 g L⁻¹) groups, this relationship became non-significant. Instead, taxa richness and total abundance were correlated positively with salinity of downwelling water in fresh sites and negatively in mesosaline sites, resulting in a peak in richness at intermediate salinities. Community composition was unrelated to direction of hydrological exchange but was strongly associated with hyporheic salinity. Hyporheic assemblages of 'fresh' rivers were typified by harpacticoid copepods and candoniid ostracods, whereas the amphipod 'Austrochiltonia' and several dipteran groups were more common below 'mesosaline' rivers. Although many hyporheic taxa collected in this study apparently have broad tolerances to salinity, secondary salinization due to human activities potentially changed community composition, possibly altering rates of ecological processes such as organic matter breakdown occurring within the sediments of streams undergoing salinization.en
dc.languageenen
dc.publisherJohn Wiley & Sons Ltden
dc.relation.ispartofRiver Research and Applicationsen
dc.titleHyporheic inverterbrate community composition in streams of varying salinity in southwestern Australia: Diversity peaks at intermediate thresholdsen
dc.typeJournal Articleen
dc.identifier.doi10.1002/rra.989en
dc.subject.keywordsFreshwater Ecologyen
local.contributor.firstnameAndrew Johnen
local.contributor.firstnamePen
local.contributor.firstnameP-E Xen
local.subject.for2008060204 Freshwater Ecologyen
local.subject.seo779902 Land and water managementen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailaboulton@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:5521en
local.publisher.placeUnited Kingdomen
local.format.startpage579en
local.format.endpage594en
local.identifier.scopusid34547741013en
local.peerreviewedYesen
local.identifier.volume23en
local.identifier.issue6en
local.title.subtitleDiversity peaks at intermediate thresholdsen
local.contributor.lastnameBoultonen
local.contributor.lastnameMarmonieren
local.contributor.lastnameSarriqueten
dc.identifier.staffune-id:aboultonen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:1641en
dc.identifier.academiclevelAcademicen
local.title.maintitleHyporheic inverterbrate community composition in streams of varying salinity in southwestern Australiaen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorBoulton, Andrew Johnen
local.search.authorMarmonier, Pen
local.search.authorSarriquet, P-E Xen
local.uneassociationUnknownen
local.identifier.wosid000248868900003en
local.year.published2007en
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