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dc.contributor.authorDunn, Ryanen_US
dc.contributor.authorJordan, Marken_US
dc.contributor.authorLemckert, Charlesen_US
dc.contributor.authorTeasdale, Peteren_US
dc.contributor.authorWelsh, Daviden_US
dc.date.accessioned2017-04-04T17:38:14Z
dc.date.available2017-04-04T17:38:14Z
dc.date.issued2009en_US
dc.date.modified2010-07-19T04:42:03Z
dc.identifier.issn00188158en_US
dc.identifier.doi10.1007/s10750-009-9748-2en_AU
dc.identifier.urihttp://hdl.handle.net/10072/30290
dc.description.abstractThe influence of natural populations of the sub-surface deposit-feeding amphipod Victoriopisa australiensis on sediment biogeochemistry was assessed by randomly collecting 21 sediment cores in a zone of Coombabah Lake, southern Moreton Bay, Australia, where the benthic infauna was dominated by this species. Cores were incubated sequentially to determine sediment-water column fluxes of oxygen, dissolved inorganic carbon and inorganic N species, followed by incubations to determine rates of denitrification and dissimilatory nitrate reduction to ammonium (DNRA) using the isotope pairing technique. Finally, each core was sieved in order to determine the population and biomass of amphipods present. Whilst all measures of overall benthic metabolism (sediment oxygen demand, and effluxes of inorganic carbon and nitrogen) showed increased with amphipod density, with rates being stimulated 70-220% at the highest categorised density range of 2,500-3,500 ind m-2, only the correlation with dissolved inorganic carbon was statistically significant. In contrast, there were no discernable trends between amphipod densities and any of the N-cycle processes with the slopes of all correlations being very close to zero. These results highlight the differences in mesocosm simulations of fauna effects, which primarily relate to shifts in rates of organic matter turnover, compared to natural sediments where fauna effects relate more to induced changes in rates of organic matter deposition. Therefore, while mesocosms represent a powerful tool to investigate the mechanisms by which fauna influences microbial metabolism in the sediment, only studies of natural sediments can determine to what extent these mechanisms function in situ.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent180199 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherSpringer Netherlandsen_US
dc.publisher.placeNetherlandsen_US
dc.relation.ispartofstudentpublicationNen_AU
dc.relation.ispartofpagefrom95en_US
dc.relation.ispartofpageto109en_US
dc.relation.ispartofissue1en_AU
dc.relation.ispartofjournalHydrobiologiaen_US
dc.relation.ispartofvolume628en_US
dc.rights.retentionYen_AU
dc.subject.fieldofresearchBiological Oceanographyen_US
dc.subject.fieldofresearchcode040501en_US
dc.titleInfluence of natural amphipod (Victoriopisa australiensis) (Chilton, 1923) population densities on benthic metabolism, nutrient fluxes, denitrification and DNRA in sub-tropical estuarine sedimenten_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.facultyGriffith Sciences, Griffith School of Environmenten_US
gro.rights.copyrightCopyright 2009 Springer Netherlands. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. The original publication is available at www.springerlink.comen_AU
gro.date.issued2009
gro.hasfulltextFull Text


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