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Abstract Field courses can provide formative experiences that also reduce disparities in STEM education. Impacts of the ongoing COVID‐19 pandemic on‐field programs have been particularly severe, as many institutions shifted to online instruction. Some courses retained in‐person field experiences during the pandemic, and achieved high student learning outcomes. Here, I describe an approach to mitigating risk of COVID‐19 and other hazards during expedition‐based field courses, and student learning outcomes achieved using that approach. I applied comprehensive risk management to in‐person field expeditions that treated COVID‐19 as a hazard, requiring mitigation to maintain an acceptable low level of risk. Prior to broad availability of COVID‐19 vaccines, we applied a coronavirus‐free “bubble” strategy in which all participants passed a COVID‐19 PCR test immediately before departure and then avoided contact with people outside our bubble. In the future, vaccination can reduce risk further. We implemented additional safety factors to reduce risk of incidents that could require evacuation into medical facilities overloaded with COVID‐19 patients. The courses were successful: we had no infections or other serious incidents and student learning outcomes were transformative. The approach provides a model for conducting immersive field courses during the pandemic and beyond. Several field course networks are implementing similar approaches to restore valuable field education opportunities that have declined during the pandemic. 

Abstract Human-driven threats are changing biodiversity, impacting ecosystem services. The loss of one species can trigger secondary extinctions of additional species, because species interact–yet the consequences of these secondary extinctions for services remain underexplored. Herein, we compare robustness of food webs and the ecosystem services (hereafter ‘services’) they provide; and investigate factors determining service responses to secondary extinctions. Simulating twelve extinction scenarios for estuarine food webs with seven services, we find that food web and service robustness are highly correlated, but that robustness varies across services depending on their trophic level and redundancy. Further, we find that species providing services do not play a critical role in stabilizing food webs – whereas species playing supporting roles in services through interactions are critical to the robustness of both food webs and services. Together, our results reveal indirect risks to services through secondary species losses and predictable differences in vulnerability across services.