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Microbial life in ridge flank crustal fluids
Julie A Huber1, H Paul Johnson, David A Butterfield
1University of Washington, School of Oceanography, Center for Astrobiology and Early Evolution, Box 357940 Seattle, 98195, USA. jhuber@mbl.edu
Environmental Microbiology
|December 14, 2005
Summary
Microbial communities thrive in old oceanic crust fluids. This study reveals diverse, active bacteria indigenous to the subseafloor, indicating varied habitats within the ocean crust.
Area of Science:
- Marine microbiology
- Geomicrobiology
- Oceanography
Background:
- Oceanic crust hosts subsurface microbial life.
- Understanding microbial diversity in old oceanic crust is limited.
- Ridge flank environments are underexplored for microbial ecosystems.
Purpose of the Study:
- To investigate microbial community diversity in old oceanic crustal fluids.
- To characterize the phylogenetic and physiological potential of subseafloor microbes.
- To explore nutrient sources supporting microbial life in oceanic crust.
Main Methods:
- Novel sampling using stainless steel probes to collect crustal fluids.
- Genetic sequencing to determine microbial community composition.
- Enrichment cultures to identify active microorganisms.
Main Results:
- Identified a diverse microbial community in old oceanic crustal fluids.
- Detected both indigenous subseafloor species and those from other deep-sea habitats.
- Evidence of a small but active microbial population dominated by bacteria.
Conclusions:
- Old oceanic crustal fluids harbor a unique and diverse microbial community.
- Nutrient inputs from seawater, sediments, and hydrothermal sources support microbial life.
- This study advances understanding of microbial life in deep-sea environments.