Warming constrains bacterial community responses to nutrient inputs in a southern, but not northern, maritime Antarctic soil

Dennis, Paul G., Newsham, Kevin K., Rushton, Steven P., Ord, Victoria J., O'Donnell, Anthony G. and Hopkins, David W. (2013) Warming constrains bacterial community responses to nutrient inputs in a southern, but not northern, maritime Antarctic soil. Soil Biology and Biochemistry, 57 248-255. doi:10.1016/j.soilbio.2012.07.009


Author Dennis, Paul G.
Newsham, Kevin K.
Rushton, Steven P.
Ord, Victoria J.
O'Donnell, Anthony G.
Hopkins, David W.
Title Warming constrains bacterial community responses to nutrient inputs in a southern, but not northern, maritime Antarctic soil
Journal name Soil Biology and Biochemistry   Check publisher's open access policy
ISSN 0038-0717
1879-3428
Publication date 2013-02-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.soilbio.2012.07.009
Volume 57
Start page 248
End page 255
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2013
Language eng
Abstract We investigated the effects of increased soil temperature, water and nutrient availability on soil bacterial communities at Wynn Knolls on Signy Island (60 °S) in the northern maritime Antarctic and at Mars Oasis (71 °S) in the southern maritime Antarctic. After 10-12 months, analyses of the concentrations of ester linked fatty acids (ELFAs) in soil indicated that bacterial communities responded positively to single applications of substrates at both locations, with 20% and 49% increases in total Gram positive and Gram negative bacterial markers, respectively, in response to the application of tryptic soy broth (TSB; a complex substrate containing organic carbon and nitrogen, plus other nutrient elements) at Wynn Knolls, and 120% and 44% increases in Gram positive bacterial markers at Mars Oasis in response to the application of TSB and the amino acid glycine (a relatively simple source of organic carbon and nitrogen), respectively. Responses to the warming treatment were not detected at Wynn Knolls, where open top chambers (OTCs) increased mean monthly soil temperatures by up to 0.7 °C, but at Mars Oasis, where OTCs increased monthly soil temperatures by up to 2.4 °C, warming led to 41% and 46% reductions in the concentrations of Gram positive bacterial markers in soil to which glycine and TSB had been applied, respectively. Warming also led to 55% and 51% reductions in the ratio of Gram positive to Gram negative markers in soils at Mars Oasis to which glycine and TSB had been applied. These data suggest that warming may constrain the responses of bacterial communities to carbon and nitrogen inputs arising from dead plant matter entering maritime Antarctic soils in future decades.
Keyword Antarctica
Climate change
Gram negative bacteria
Gram positive bacteria
Nutrient input
Open top chambers (OTCs)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 1 August 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 11 Apr 2013, 00:47:19 EST by Susan Cooke on behalf of Advanced Water Management Centre