Reposted by Nicole Dubilier
A study by @oceanna.bsky.social et al. reveals a dynamic equilibrium: symbiotic communities in gutless oligochaetes remain highly stable on a micro-evolutionary scale, but change rapidly over short macro-evolutionary timescales as host species diverge.
www.science.org/doi/10.1126/...
science.org
Stability in flexibility: Shifting alliances stabilize the symbioses of marine animals over 150 million years
Many animals benefit from microbial symbionts that aid digestion, supply essential nutrients, or provide defense. When this dependence becomes obligate, as in gutless marine oligochaetes that have los...