Flames roared through Santa Barbara County in late 2017. UC Santa Barbara canceled classes, and the administration recommended donning an N95, long before the COVID pandemic made the mask a household item. Smoke and ash choked the air, but the Thomas Fire’s effects weren’t restricted to the land and sky. Huge amounts of ash settled into the oceans, leaving researchers to wonder what effect it might have on marine life.
Now scientists at UC Santa Barbara have discovered that wildfire ash adds nutrients to marine systems, and that microbes at the base of the food web can use these nutrients to grow. This contrasts with the impacts of ash in freshwater ecosystems, where it is often toxic. The results appear in the Proceedings of the Royal Society B.