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Saltwater intrusion history shapes the response of bacterial communities upon rehydration

Nelson, Tiffanie M., Streten, Claire, Gibb, Karen S. and Chariton, Anthony A. (2015). Saltwater intrusion history shapes the response of bacterial communities upon rehydration. Science of the Total Environment,502(January):143-148.

Document type: Journal Article
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IRMA ID 75039815xPUB613
Title Saltwater intrusion history shapes the response of bacterial communities upon rehydration
Author Nelson, Tiffanie M.
Streten, Claire
Gibb, Karen S.
Chariton, Anthony A.
Journal Name Science of the Total Environment
Publication Date 2015
Volume Number 502
Issue Number January
ISSN 0048-9697   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84907545965
Start Page 143
End Page 148
Total Pages 6
Place of Publication Netherlands
Publisher Elsevier BV
HERDC Category C1 - Journal Article (DIISR)
Abstract Saltwater intrusion (SWI) can result in the loss of dominant vegetation from freshwater habitats. In northern Australia, sea level is predicted to rise 17–50 cm by 2030–2070. This will exacerbate the impact of SWI, threatening Ramsar-listed habitats. Soil bacteria in these habitats play a significant role in biogeochemical cycling, regulating availability of essential nutrients such as nitrogen to vegetation. However, there is limited understanding as to how SWI will impact these soil bacteria. Floodplain soil samples were collected from the South Alligator River floodplain in Northern Australia from sites with contrasting histories of SWI. A SWI event was simulated over 7 days with treatments of saltwater and freshwater. Bacterial community composition before and after treatment were measured using next generation sequencing of bacterial DNA. Sites with no history of SWI showed no significant changes in community taxonomic composition following treatments, suggesting the community at these sites have broad functional capacity which may be due to their historic conditioning over many years. Sites with a history of SWI showed a significant response to both treatments. Following saltwater treatment, there was an increase in sulfate-reducing bacteria, which are known to have an impact on carbon and nitrogen cycling. We suggest that the impact of SWI causes a shift in the soil bacteria which alters the community to one which is more specialised, with implications for the cycling of essential elements and nutrients.
Keywords Floodplain
Biogeochemical cycling
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