Aggregates of different sizes and stability in soil create a composite of ecological niches differing in terms of physico-chemical and structural characteristics. The aim of this study was to identify, using DNA-SIP and mRNA-based microarray analysis, whether shifts in activity and community composition of methanotrophs occur when ecological niches created by soil structure are physically perturbed. Landfill cover soil was subject to three treatments termed: ‘control’ (minimal structural disruption), ‘sieved’ (sieved soil using 2 mm mesh) and ‘ground’ (grinding using mortar and pestle). ‘Sieved’ and ‘ground’ soil treatments exhibited higher methane oxidation potentials compared with the ‘control’ soil treatment. Analysis of the active community composition revealed an effect of physical disruption on active methanotrophs. Type I methanotrophs were the most active methanotrophs in ‘sieved’ and ‘ground’ soil treatments, whereas both Type I and Type II methanotrophs were active in the ‘control’ soil treatment. The result emphasize that changes to a particular ecological niche may not result in an immediate change to the active bacterial composition and change in composition will depend on the ability of the bacterial communities to respond to the perturbation.

Item Type:	Refereed Article
Keywords:	physical disturbance, ecological niches, soil structure, methanotrophs, soil biology
Research Division:	Environmental Sciences
Research Group:	Soil Sciences
Research Field:	Soil Biology
Objective Division:	Environment
Objective Group:	Ecosystem Assessment and Management
Objective Field:	Ecosystem Assessment and Management not elsewhere classified
UTAS Author:	Bodrossy, L (Dr Levente Bodrossy)
ID Code:	117045
Year Published:	2011
Web of Science® Times Cited:	7
Deposited By:	Tasmanian Institute of Agriculture
Deposited On:	2017-05-29
Last Modified:	2017-09-29
Downloads:	0