Methane dynamics in subtropical freshwater reservoirs and the mediating microbial communities

Musenze, Ronald S., Fan, Lu, Grinham, Alistair, Werner, Ursula, Gale, Deborah, Udy, James and Yuan, Zhiguo (2016) Methane dynamics in subtropical freshwater reservoirs and the mediating microbial communities. Biogeosciences, 128 1: 233-255. doi:10.1007/s10533-016-0206-8


Author Musenze, Ronald S.
Fan, Lu
Grinham, Alistair
Werner, Ursula
Gale, Deborah
Udy, James
Yuan, Zhiguo
Title Methane dynamics in subtropical freshwater reservoirs and the mediating microbial communities
Journal name Biogeosciences   Check publisher's open access policy
ISSN 0168-2563
1573-515X
Publication date 2016-03
Sub-type Article (original research)
DOI 10.1007/s10533-016-0206-8
Open Access Status Not Open Access
Volume 128
Issue 1
Start page 233
End page 255
Total pages 23
Place of publication Dordrecht, GX, Netherlands
Publisher Springer Netherlands
Collection year 2017
Language eng
Formatted abstract
Methane (CH4) is a potent greenhouse gas of primarily biogenic origin. Aquatic systems are significant CH4 sources but uncertainty surrounds their estimated source strengths. There is limited understanding of CH4 concentrations variability in both space and time (dynamics) and the responsible drivers. Water column CH4 dynamics were investigated in three subtropical freshwater reservoirs in Southeast Queensland, Australia, during four seasons in 2011–2012. The reservoirs (Little Nerang Dam-LND, Lake Baroon-LB and Lake Wivenhoe-LW) are of different sizes and characteristics. Overall, CH4 concentrations were significantly higher in the strongly stratified LND (0.03–361 µM) with a more forested catchment and sheltered landscape, intermediate in LB (0.05–220 µM) and lowest in the relatively well-mixed LW (0.04–150 µM) in a more open grassland landscape. CH4 concentrations were highest in summer and spring when the reservoirs were strongly stratified and lowest in winter when the reservoirs were more mixed with deeper dissolved oxygen penetration. Concentrations were also highest in the anoxic water column and often had minima at the oxycline when stratification occurred. Highest CH4 concentrations were predominantly at the sediment–water interface but there were indications of high CH4 production within the anoxic water column in both LB and LND. Moderate CH4 peaks were consistently observed in the oxic subsurface water in all reservoirs likely increasing diffusive CH4 fluxes. DO was a strong proxy for methanotrophy while methanogenesis was best indicated by the oxidation–reduction potential of the water column. Microbial community analysis revealed methanotrophs throughout the water column but methanogenic Archaea mainly proliferated below the oxycline. This is the first comprehensive field-based study towards understanding of CH4 dynamics in subtropical freshwater systems.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Advanced Water Management Centre Publications
 
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Created: Tue, 19 Apr 2016, 15:16:23 EST by Dr Alistair Grinham on behalf of School of Civil Engineering