Marine-influenced microbial communities inhabit terrestrial hot springs on a remote island volcano

Raoul Island is a subaerial island volcano approximately 1000 km northeast of New Zealand. Its caldera contains a circumneutral closed-basin volcanic lake and several associated pools, as well as intertidal coastal hot springs, all fed by a hydrothermal system sourced from both meteoric water and se...

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Bibliographic Details
Published in:Extremophiles : life under extreme conditions 2018-07, Vol.22 (4), p.687-698
Main Authors: Stewart, Lucy C., Stucker, Valerie K., Stott, Matthew B., de Ronde, Cornel E. J.
Format: Article
Language:English
Subjects:
Biochemistry
Biomedical and Life Sciences
Biotechnology
Coastal environments
Communities
Community composition
Cyanobacteria
Geochemistry
Hot springs
Hydrothermal plumes
Hydrothermal systems
Iron
Lake basins
Lakes
Life Sciences
Meteoric water
Methanogenic bacteria
Microbial activity
Microbial Ecology
Microbiology
Microbiomes
Microorganisms
Original Paper
Planctomycetaceae
Pools
Seawater
Space life sciences
Species diversity
Sulfur
Sulphur
Terrestrial environments
Thermophilic microorganisms
Volcanic activity
Volcanoes
Water springs
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Summary:Raoul Island is a subaerial island volcano approximately 1000 km northeast of New Zealand. Its caldera contains a circumneutral closed-basin volcanic lake and several associated pools, as well as intertidal coastal hot springs, all fed by a hydrothermal system sourced from both meteoric water and seawater. Here, we report on the geochemistry, prokaryotic community diversity, and cultivatable abundance of thermophilic microorganisms of four terrestrial features and one coastal feature on Raoul. Hydrothermal fluid contributions to the volcanic lake and pools make them brackish, and consequently support unusual microbial communities dominated by Planctomycetes, Chloroflexi, Alphaproteobacteria, and Thaumarchaeota, as well as up to 3% of the rare sister phylum to Cyanobacteria, Candidatus Melainabacteria. The dominant taxa are mesophilic to moderately thermophilic, phototrophic, and heterotrophic marine groups related to marine Planctomycetaceae. The coastal hot spring/shallow hydrothermal vent community is similar to other shallow systems in the Western Pacific Ocean, potentially due to proximity and similarities of geochemistry. Although rare in community sequence data, thermophilic methanogens, sulfur-reducers, and iron-reducers are present in culture-based assays.
ISSN:1431-0651
1433-4909
DOI:10.1007/s00792-018-1029-4