How an influx of salt may affect microbial ecosystems

As sea levels rise and seawater encroaches on freshwater ecosystems, MIT researchers have uncovered a surprising trade-off. Higher salt levels in rivers and estuaries cause microbial communities to lose diversity—faster-growing strains tend to dominate. Yet according to a new study published in Nature Microbiology, these communities maintain their overall growth rate despite this shift. The MIT team tested samples from the Charles River, Boston Harbor, and a Nahant beach, then verified the findings in natural ecosystems like the Chesapeake Bay and Baltic Sea. While stable growth might sound reassuring, the reduced diversity could leave these communities more vulnerable to other environmental stresses. Lead researcher Jana Huisman emphasizes that climate change brings far more than rising temperatures—salinity shifts pose their own ecological risks.

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