IIT Madras researchers have analysed thousands of ocean samples to uncover how marine bacterial communities form, interact and maintain stability worldwide.

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• Researchers analysed 4,611 ocean microbiome samples spanning tropical, temperate and polar regions to investigate bacterial diversity and community assembly patterns.
• The study found that stochastic processes influence marine microbial community formation across latitude zones, revealing complex mechanisms governing ocean bacterial ecosystems.
• In polar regions, dispersal limitation emerged as the dominant assembly mechanism, while both dispersal limitation and selection influenced temperate and tropical communities.
• Polar microbial communities showed high network modularity and robustness, but their stability remained vulnerable when important central taxa were removed.
• The researchers identified specialist microbial taxa as important contributors to network structure and stability, despite their comparatively limited distribution across communities.
• The findings suggest that losing specialist microorganisms could significantly weaken marine microbial networks, particularly under climate change and environmental disturbances.
• The research provides a global, latitude-based perspective on marine microbial ecology and could support better understanding of ocean health under environmental change.