Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/60666
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dc.contributor.authorWakelin, S.en
dc.contributor.authorChu, G.en
dc.contributor.authorBroos, K.en
dc.contributor.authorClarke, K.en
dc.contributor.authorLiang, Y.en
dc.contributor.authorMcLaughlin, M.en
dc.date.issued2010en
dc.identifier.citationBiology and Fertility of Soils, 2010; 46(4):333-342en
dc.identifier.issn0178-2762en
dc.identifier.issn1432-0789en
dc.identifier.urihttp://hdl.handle.net/2440/60666-
dc.description.abstractIn soils, the microbially mediated decomposition of plant residue is a key process with wide ranging effects on ecosystem functioning and stability. Understanding the impact of contamination on this process is of high importance. We investigated the effects of long-term (6 years) copper exposure on the capacity of soil microbiota to decompose newly added resources; dried and ground Medicago truncatula stubble. In addition, the effects on the microbial community structure across the three domains were explored using polymerase chain reaction–denaturing gradient gel electrophoresis rRNA gene profiling. Ecological distances in community structure between treatments was calculated (Kulczynski) and effects tested using PERMANOVA. Clear dose–response relationships were present between microbial respiration (CO2 evolution) and soil Cu level in soils receiving medic, but not under basal conditions (i.e., no medic added). These show that relatively labile forms of C are needed to drive microbial ecotoxicological responses and that microbial adaptation to the presence of Cu in the soils—after >6 years exposure—was functionally limited. Bacterial, archaeal and fungal communities showed significant (P < 0.05) levels of structural change in soils across the Cu gradient, demonstrating that species replacement had occurred following strong selective pressure. Addition of medic resources to the soils caused significant shifts in the bacterial and archaeal community structure (P < 0.001), which occurred across the entire range of soil Cu levels. For the fungal community, a significant interaction effect was present between Cu and medic addition (P =  0.002). At low Cu levels, medic addition caused large shifts in community structure, but this was negligible under high Cu levels. This was reflected in significant changes in the level of community structural dispersion at low compared with high Cu levels. As such, we show that Cu limits the capacity of soil fungal communities to rapidly respond to new resource capture. Given the primary role of soil fungi in plant material decomposition, this may have wide ranging impacts on wider ecosystem processes including nutrient cycling, trophic interactions, food web stability and energy transfer.en
dc.description.statementofresponsibilitySteven Alan Wakelin, Guixin Chu, Kris Broos, K. R. Clarke, Yongchao Liang and Mike J. McLaughlinen
dc.language.isoenen
dc.publisherSpringer-Verlagen
dc.rights© Springer-Verlag 2009en
dc.subjectDecomposition; Microbial community structure; Copperen
dc.titleStructural and functional response of soil microbiota to addition of plant substrate are moderated by soil Cu levelsen
dc.typeJournal articleen
dc.identifier.rmid0020094718en
dc.identifier.doi10.1007/s00374-009-0436-1en
dc.identifier.pubid36185-
pubs.library.collectionEarth and Environmental Sciences publicationsen
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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