Historical Disturbance Patterns Leave Long-Lasting Effects on Microbial Communities
A new preprint study using bacterial model systems shows that past disturbance regimes leave persistent legacies that shape how microbial communities respond to new disturbances and invasive species roughly 120 generations later. The research used controlled bacterial experiments to test theoretical predictions about historical ecological legacies. The findings suggest that ignoring disturbance history may undermine efforts to predict how ecosystems will respond to climate change and human-driven habitat disruption.
Researchers publishing on bioRxiv conducted experiments with bacterial communities subjected to disturbance regimes over approximately 120 generations, then exposed to novel disturbance regimes and invasions for another 120 generations. The study found that historical disturbance regimes produced persistent effects on the relationship between disturbance and community diversity. Notably, certain combinations of past and novel disturbance regimes promoted invasion even as resident diversity increased, while other combinations prevented it — a finding that may help reconcile longstanding contradictions in the ecological literature on diversity and invasibility. The authors argue that historical legacies are a critical but underappreciated factor in disturbance ecology, particularly as climate change and human activity accelerate shifts in disturbance regimes worldwide. Because most prior disturbance research focuses only on current conditions, these results highlight a significant gap in predictive ecological models.
What's missing
As a preprint, this study has not yet undergone peer review. The study relies on a bacterial model system, and it remains unclear how well findings scale to more complex, multi-trophic ecosystems or longer ecological timescales. The specific disturbance types, intensities, and bacterial species used are not described in the abstract, limiting assessment of generalizability. The mechanisms driving the persistent legacies are not elaborated upon, leaving open questions about whether the effects are genetic, ecological, or both.
What different sources said
- bioRxivCenter
Disturbance regime changes leave long-lasting legacies on a microbial community's composition and function
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