The Ocean Microbiomics Database reveals thermal niches and projected pressure on marine microbes in a warming ocean

The Ocean Microbiomics Database (OMDB) has shed light on the impact of warming oceans on marine microbial communities. By analyzing 274,282 genomes from 31,058 species-level clusters, researchers have discovered that temperature plays a crucial role in shaping the structure and distribution of these microbial communities. The database, accessible at https://omdb.microbiomics.io, reveals that surface temperature can be predicted from community composition, driven by thermal niche partitioning among related species.

When modeling present-day distributions globally, the study found that projected warming leads to a decline in microbial richness at a faster rate than relative abundance, with the most significant losses occurring at high latitudes and among underexplored lineages. By categorizing 5,891 species into four thermal clusters, the research uncovers ecological structures linked to genome streamlining, protein thermostability, and marker-gene physicochemistry.

This information enables the prediction of a microorganism's temperature that maximizes its abundance based solely on its genetic code. Ultimately, the OMDB serves as a comprehensive platform linking molecular traits to global ecology, providing a genome-resolved foundation for understanding how temperature, a primary driver of ocean microbial life, will continue to influence it as the ocean continues to warm.