Journal article
Time-resolved microbial guild responses to tidal cycling in a coastal acid-sulfate system
Environmental chemistry, Vol.15(2), pp.2-17
2018
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Abstract
Tidal inundation has been trialled as a remediation strategy for coastal acid-sulfate soil (CASS) environ-ments. Microbial community structure and activity are hypothesised to play key roles in this process, but remain poorly understood for long-term (decadal or longer) CASS ecosystems. More detailed understanding of the distribution and timing of microbial activity in CASS ecosystems is necessary to evaluate their real bioremediation potential. In this study, we compared 16S ribosomal DNA (rRNA) and RNA (as copy DNA, cDNA, a proxy for overall enzymatic activity) sequence datasets to characterise and resolve microbial community structure and activity across a tidal cycle in
the East Trinity long-term CASS wetland (Queensland, Australia). The timing and extent of activity among abundant (.1 %) and rare (,0.1 %) microbial taxa showed that a larger number of rare members (phylotype) displayed greater overall range in activity than was apparent for more abundant members. Certain taxa from both abundant and rare
populations varied rapidly in their 16S rRNA levels in response to tidal cycling. The observation of rRNA accumulation in response to drying and rewetting was used to divide the microbial community structure into ‘early responders’ (within 3 h of dry-down or wet-up) and ‘delayed responders’ (3þ h after wet-up). Response patterns were phylogenetically
constrained across supra- to subtidal zones across all tidal stages. Microbial iron- and sulfur-cycling networks included these rare but active taxa, illustrating their spatiotemporal complexity, which should be considered for an accurate assessment of bioremediation efficiency, and specially for validating predictive biogeochemical models of long-term
CASS ecosystems
Details
- Title
- Time-resolved microbial guild responses to tidal cycling in a coastal acid-sulfate system
- Creators
- Yu-Chen Ling - University of MelbourneHan Ming Gan - Deakin UniversityMichelle Bush - Southern Cross UniversityRichard Bush - University of Newcastle AustraliaJohn W Moreau - University of Melbourne
- Publication Details
- Environmental chemistry, Vol.15(2), pp.2-17
- Publisher
- CSIRO Publishing
- Identifiers
- 991012926979902368
- Academic Unit
- Office of Deputy Vice Chancellor, Research; Southern Cross GeoScience
- Language
- English
- Resource Type
- Journal article