Littoral wetlands are responsible for most of the total methane (CH₄) emissions from lake ecosystems. We show that seasonally variable hydrological and temperature conditions in the littoral wetland of a eutrophic boreal lake affect the community composition and gene transcription of methanotrophs measured by a particulate methane monooxygenase (pmoA) gene-targeted microarray. Type Ib freshwater-cluster methanotrophs were favoured by the high water level, and CH₄ oxidation was positively correlated with their pmoA gene transcripts. In the dry subsite of the wetland, the more stagnant hydrological conditions in summer and autumn induced the dominance of type II methanotrophs over type I methanotrophs (community composition and pmoA gene transcripts). The relative abundance of type II methanotrophs increased in winter. The results provide new insight into the variation of methanotroph communities across seasons in littoral wetlands.

Item Type:	Refereed Article
Keywords:	littoral wetland, methanotrophs, methane oxidation, seasonal variation, pmoA gene, pmoA transcription
Research Division:	Environmental Sciences
Research Group:	Environmental management
Research Field:	Environmental assessment and monitoring
Objective Division:	Environmental Management
Objective Group:	Marine systems and management
Objective Field:	Assessment and management of benthic marine ecosystems
UTAS Author:	Bodrossy, L (Dr Levente Bodrossy)
ID Code:	116422
Year Published:	2012
Web of Science® Times Cited:	22
Deposited By:	Tasmanian Institute of Agriculture
Deposited On:	2017-05-10
Last Modified:	2017-09-04
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