The rocky coasts of the Pacific Northwest are home to an amazing array of animals and algae. However, changing oceanographic conditions threaten these iconic ecosystems and there is growing evidence that rocky intertidal communities are becoming more unstable, and some are even experiencing regime shifts from one type of community to another. Recent research points to marine heatwaves, El Niño, sea star wasting disease, and the intensification of upwelling as leading factors causing these changes. In this seminar, I describe research that I and other ecologists from Oregon State University are conducting on the resilience of rocky intertidal ecosystems in the Pacific Northwest. Click here to view the recording.