Publications
Disentangling the drivers of functional complexity at the metagenomic level in Shark Bay microbial mat microbiomes
A groundbreaking metagenomic analysis of Shark Bay's microbial mats reveals the functional complexity underlying its biogeochemical cycles, particularly carbon fixation via the Wood–Ljungdahl pathway. The study identified 87 medium-to-high-quality metagenome-assembled genomes (MAGs), including novel bins under the Asgard archaeal groups Thorarchaetoa and Lokiarchaeota. Key pathways for sulfur, nitrogen, phosphorus cycling, and environmental adaptation—such as UV resistance, hypersalinity tolerance, and heavy metal resistance—were mapped at a millimeter scale using shotgun sequencing on the Illumina NextSeq 500 platform. Over-representation of genes like those for sulfate assimilation, methanogenesis, and polyhydroxyalkanoate (PHA) synthase suggests specialized carbon storage and microbial interactions. The research also highlights putative viral defensive mechanisms, offering new models for how biogeochemical processes and adaptive responses partition in these extreme environments.
New multi-scale perspectives on the stromatolites of Shark Bay, Western Australia
A recent intensive field program at Shark Bay, Western Australia, has revealed that coccoid cyanobacteria, not filamentous ones, dominate the microbial mats forming lithified stromatolite buildups, contradicting traditional views. This discovery was enabled by multi-scale mapping and molecular studies, which identified eight distinct 'Stromatolite Provinces' with unique geographic distributions of stromatolite structures. Additionally, analysis of internal fabrics showed pervasive microcrystalline carbonate precipitation in microbial mats, suggesting parallels with Precambrian stromatolites. These findings advance our understanding of benthic ecosystems on early Earth and provide a foundation for further studies on stromatolite morphogenesis.
Unravelling core microbial metabolisms in the hypersaline microbial mats of Shark Bay using high-throughput metagenomics
Shark Bay's hypersaline microbial mats, potential analogues of Earth's earliest ecosystems, exhibit unique metabolic pathways not found elsewhere. A first-of-its-kind shotgun metagenomic analysis revealed that these mats are dominated by Proteobacteria, Cyanobacteria, and Bacteroidetes, with distinct microbial community structures compared to Highbourne Cay (Bahamas). Notably, Shark Bay mats feature alternative non-rubisco-based carbon metabolism pathways, such as the reductive TCA cycle and 3-hydroxypropionate/4-hydroxybutyrate cycles, which are absent in other studied ecosystems. Additionally, evidence suggests novel nitrogen and heavy metal cycling processes involving arsenic, mercury, copper, and cadmium. Archaea, highly represented here, may play critical roles in ecosystem function, highlighting Shark Bay's microbial mats as unique and complex ecosystems warranting further study.
Carbon, nitrogen and phosphorus storage in subtropical seagrass meadows: examples from Florida Bay and Shark Bay
Seagrass meadows in Florida Bay and Shark Bay, Western Australia, store significant amounts of organic carbon and nutrients, with Shark Bay soils containing 21% more organic carbon and 35% more phosphorus than those in Florida Bay. Shark Bay also exhibits lower soil density, indicating a less compacted structure. Hypersaline regions in both bays show higher surficial soil organic carbon content. While Florida Bay's soil profiles suggest increased phosphorus delivery and primary productivity over the past century, Shark Bay's profiles indicate a decline in these factors over the last 1000 years. Despite differences, both bays rank among global hotspots for coastal ecosystem organic carbon storage, with Shark Bay storing an average of 243.0 MgCorg ha⁻¹ compared to Florida Bay's 163.5 MgCorg ha⁻¹.
Characteristics, distribution and morphogenesis of subtidal microbial systems in Shark Bay, Australia
Extensive subtidal microbial deposits, covering approximately 300 km² of Hamelin Pool in Shark Bay, Australia, have been mapped and analyzed for the first time. These deposits, dominated by aragonite with distinctive isotopic signatures (δ13C +4.46 to +5.88; δ18O +3.06 to +3.88), reveal a subtidal microbial habitat 10 times larger than previously known intertidal areas. The study highlights two depositional stages, with growth rates ranging from <0.1 mm/year to 0.5 mm/year, and provides evidence of late Holocene sea-level changes through fabric sequences. Distinct microbial communities and lateral fabric relations were identified, emphasizing the geoscientific significance of Hamelin Pool for early life studies and ancient environmental interpretations.
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