Microbial Communities across Global Marine Basins Show Important Compositional Similarities by Depth

Area of Science:

• Marine microbiology
• Environmental science
• Bioremediation

Background:

• Hydrocarbon-degrading microorganisms were identified after the Deepwater Horizon (DWH) spill.
• Laboratory studies showed rapid hydrocarbon biodegradation at 5°C.
• Understanding microbial communities is vital for predicting and managing petroleum spills.

Purpose of the Study:

• To investigate the taxonomic composition of microbial communities in six global ocean basins.
• To identify ubiquitous and basin-specific hydrocarbon-degrading microbial taxa.
• To quantify microbial subpopulations involved in petroleum hydrocarbon biodegradation.

Main Methods:

• Analysis of microbial community taxonomic composition across six distinct marine basins.
• Comparison of shallow-water and deep-water microbial communities.
• Identification of microbial taxa enriched in response to petroleum spills.

Main Results:

• Shallow-water microbial communities were similar across all studied basins.
• Deep-water communities showed basin-specific subclusters.
• Hydrocarbon-degrading genera like Actinobacteria, Pseudomonas, and Rhodobacteriacea were common globally.
• Pseudoalteromonas and Oleibacter were enriched in specific basins.
• Microbial taxa enriched after the DWH spill were found in other marine basins.

Conclusions:

• Petroleum-degrading bacteria are ubiquitous in marine environments.
• Specific microbial taxa play key roles in hydrocarbon biodegradation across different ocean basins.
• This research provides critical data for decision-making during petroleum spill incidents.