Biodiversity of living, non marine, thrombolites of Lake Clifton, Western Australia

D. Gleeson, David Wacey, Ian Waite, Anthony G O'Donnell, Matt Kilburn

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

Lake Clifton in Western Australia is recognized as a critically endangered ecosystem and the only thrombolite reef in the southern hemisphere. There have been concerns that increases in salinity and nutrient run-off have significantly impacted upon the thrombolite microbial community. Here we used cultivation-independent molecular approaches to characterize the microbial diversity of the thrombolites at Lake Clifton. The most dominant phyla currently represented are the Proteobacteria with significant populations of Bacteroidetes and Firmicutes. Cyanobacteria, previously invoked as the main drivers of thrombolite growth, represent only a small fraction (~1–3% relative abundance) of the microbial community. We report an increase in salinity and nitrogen levels at Lake Clifton that may be contributing to a change in dominant microbial populations. This heightens concerns about the long-term health of the Lake Clifton thrombolites; future work is needed to determine if phyla now dominating this system are capable of the required mineral precipitation for continued thrombolite growth.
Original languageEnglish
Pages (from-to)850-859
Number of pages10
JournalGeomicrobiology Journal
Volume33
Issue number10
Early online date16 Mar 2016
DOIs
Publication statusPublished - 28 Nov 2016

Keywords

  • Diversity
  • microbialite
  • sequencing
  • thrombolites

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