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Understanding and creating biocementing beachrocks via biostimulation of indigenous microbial communities


Bacterially induced precipitation of minerals leading to cementation of natural geological formations has been well recorded in a variety of environments. A range of microbial pathways and geochemical processes have been found to influence the cementation processes; but detailed formation mechanisms and biogeochemical relationships are still not very clear. There has been a growing demand for the application of bacterially driven biocementation in a number of geotechnical engineering applications recently. Here, we aimed to unpin the mechanisms behind the formation of actively mineralising beachrock sediments at Lucky Bay in Western Australia to understand the natural accretionary processes and potential of indigenous bacterial communities in biocementation. We observed ferruginous, aluminosilicate and carbonate cements along with extensive extra polymeric substances, borings with possible microbial activities in certain sections of native beachrock sediments. Cement precipitation under calcium- and iron-rich microenvironments sourced from seawater and iron creek seems to be driven by both biogenic and abiogenic processes in nature. Native microbial communities with a dominance of the genera Halococcus and Marinobacter were recorded. Enrichment of native bacterial communities under seawater media conditions was conducted which lead to successful biomineralisation of calcitic and ferruginous cements under in vitro conditions although the community composition changed significantly. Nanomechanical properties of natural and laboratory synthesised cement crystals showed that engineered biocement is highly promising. The results of this study clearly demonstrate biological influence in the formation of natural cements and hint significant potential of biostimulation which can be harnessed for different engineering applications including coastal erosion.

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The authors acknowledge the use of Curtin University’s Microscopy, Microanalysis and Chemical analysis Facility at John de Laeter Research Centre whose instrumentation has been partially funded by the University, State and Commonwealth Governments. The authors also thank TSW Analytical (Perth, Australia) for their help with ICP-MS testing. The authors thank Dr. Anna Heitz from the Department of Civil Engineering at Curtin University for her help with sampling and fieldwork. The authors thank Ms. Sakshi Tiwari from the Department of Civil Engineering at Curtin University for her help with bacterial sequencing analysis.


The funding for this study was provided by Curtin University, Western Australia, Australia.

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ND contributed to the concepts and ideas, fieldwork, designing of research, supervision of experiments, analysis of data and writing. AR contributed to the fieldwork, experiments, analysis of data. PP contributed to the experiments and analysis of data. AM contributed to the fieldwork and analysis of data. All authors read and approved the final manuscript.

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Correspondence to Navdeep K. Dhami.

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The article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare that they have no conflict of interest.

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Ramachandran, A.L., Polat, P., Mukherjee, A. et al. Understanding and creating biocementing beachrocks via biostimulation of indigenous microbial communities. Appl Microbiol Biotechnol 104, 3655–3673 (2020).

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  • Beachrocks
  • Biodiversity
  • Biocement
  • Calcium carbonate minerals
  • Ferruginous minerals
  • Nanomechanical characterisation