How Bacteria Battle on Water Planets ⚡ экспресс
For understanding life on hycean planets (ocean worlds with a hydrogen atmosphere), the Lotka–Volterra ecological equations have been applied for the first time. Modeling the water column with 1–5 species of anaerobic bacteria showed that a great diversity of communities is possible. Photosynthetic bacteria on the surface suppress those in the depths, like an algal bloom in a lake. Bacteriophages (bacterial viruses) can wipe out the ecosystem or, conversely, boost biodiversity—depending on when they show up. On tidally locked worlds, constant light makes populations more stable, but peak densities are lower. This is a first step toward predicting biosignatures.
Simple equations that describe fox and rabbit cycles have been turned to bacteria on distant exoplanets, like K2-18 b. These worlds hold deep oceans under thick hydrogen skies. Like duckweed on a pond, light-eating microbes cover the sunlit water surface, stealing light from those below.
Researchers simulated an ocean column with five bacterial species. Without viruses, phototrophs monopolize resources—much like an algal bloom turning a lake green. But on planets locked in endless day (one side always facing the star), there are no day-night cycles. Populations stay stable, never surging, though smaller overall.
And here’s the twist: these bacteria might feed not only on light but also on the hydrogen enveloping the planet—a far more abundant fuel.
🎯 Some earthly bacteria thrive on hydrogen, anticipating the atmosphere of distant ocean planets.
🎬 In Stanisław Lem’s ‘Solaris’, a sentient planetary ocean defies comprehension—a literary echo of these microbial rivalries.