Document Detail

Changes in the microbial community structure of bacteria, archaea and fungi in response to elevated CO(2) and warming in an Australian native grassland soil.
MedLine Citation:
PMID:  23039205     Owner:  NLM     Status:  Publisher    
The microbial community structure of bacteria, archaea and fungi is described in an Australian native grassland soil after more than 5 years exposure to different atmospheric CO(2) concentrations ([CO(2) ]) (ambient, + 550 ppm) and temperatures (ambient, + 2°C) under different plant functional types (C (3) and C (4) grasses) and at two soil depths (0-5 cm and 5-10 cm). Archaeal community diversity was influenced by elevated [CO(2) ], while under warming archaeal 16S rRNA gene copy numbers increased for C (4) plant Themeda triandra and decreased for the C (3) plant community (P < 0.05). Fungal community diversity resulted in three groups based upon elevated [CO(2) ], elevated [CO(2) ] plus warming and ambient [CO(2) ]. Overall bacterial community diversity was influenced primarily by depth. Specific bacterial taxa changed in richness and relative abundance in response to climate change factors when assessed by a high-resolution 16S rRNA microarray (PhyloChip). Operational taxonomic unit signal intensities increased under elevated [CO(2) ] for both Firmicutes and Bacteroidetes, and increased under warming for Actinobacteria and Alphaproteobacteria. For the interaction of elevated [CO(2) ] and warming there were 103 significant operational taxonomic units (P < 0.01) representing 15 phyla and 30 classes. The majority of these operational taxonomic units increased in abundance for elevated [CO(2) ] plus warming plots, while abundance declined in warmed or elevated [CO(2) ] plots. Bacterial abundance (16S rRNA gene copy number) was significantly different for the interaction of elevated [CO(2) ] and depth (P < 0.05) with decreased abundance under elevated [CO(2) ] at 5-10 cm, and for Firmicutes under elevated [CO(2) ] (P < 0.05). Bacteria, archaea and fungi in soil responded differently to elevated [CO(2) ], warming and their interaction. Taxa identified as significantly climate-responsive could show differing trends in the direction of response ('+' or '-') under elevated CO(2) or warming, which could then not be used to predict their interactive effects supporting the need to investigate interactive effects for climate change. The approach of focusing on specific taxonomic groups provides greater potential for understanding complex microbial community changes in ecosystems under climate change.
Helen L Hayden; Pauline M Mele; Damian S Bougoure; Claire Y Allan; Sorn Norng; Yvette M Piceno; Eoin L Brodie; Todd Z Desantis; Gary L Andersen; Amity L Williams; Mark J Hovenden
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-30
Journal Detail:
Title:  Environmental microbiology     Volume:  -     ISSN:  1462-2920     ISO Abbreviation:  Environ. Microbiol.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-10-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883692     Medline TA:  Environ Microbiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Society for Applied Microbiology and Blackwell Publishing Ltd.
Department of Primary Industries, Biosciences Research Division, Victorian AgriBiosciences Centre, 1 Park Drive, Bundoora, Victoria, 3083, Australia.
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