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The University of Southern California’s (USC) Joint Educational Project’s STEM Education Programs hosted a three-day summer workshop focused on marine microbiology and coastal deoxygenation for high school educators. To increase ocean literacy in high school students from Title I schools, topical marine science research was translated into four lesson plans appropriate for classrooms that teach biology and environmental science. The lesson plans focus on how marine microbes affect and are affected by the dissolved oxygen content of seawater but covered diverse oceanography topics including microbial ecology, nutrient cycling, physical ocean dynamics, and climate change. This education framework was designed to promote and facilitate hands on discovery-based learning and making observations about the natural world. The workshop and lesson plan development were executed in partnership with faculty and graduate students researching marine microbes and oceanography from USC’s Marine and Environmental Biology department to provide scientific expertise on the subject matter. At the workshop, educators were guided through each lesson plan and given classroom sets of materials to complete each of the experiments in their own classrooms. Educators also had the opportunity to experience the academic research process at both USC and the Wrigley Institute of Environmental Studies on Catalina Island, California. Teachers valued this interactive experience to learn from professional scientists and STEM educators. They left the workshop equipped with the knowledge and confidence to teach these marine microbiology and biogeochemistry concepts in their classrooms. 

Abstract Diatoms have well‐recognized roles in fixing and exporting carbon and supplying energy to marine ecosystems, but only recently have we begun to explore the diversity and importance of nano‐ and pico‐diatoms. Here, we describe a small (ca. 5 μm) diatom from the genusChaetocerosisolated from a wintertime temperate estuary (2°C, Narragansett Bay, Rhode Island), with a unique obligate specialization for low‐light environments (< 120 μmol photons m⁻² s⁻¹). This diatom exhibits a striking interaction between irradiance and thermal responses whereby as temperatures increase, so does its susceptibility to light stress. Historical 18S rRNA amplicon data from our study site show this isolate was abundant throughout a 6‐yr period, and its presence strongly correlates with winter and early spring months when light and temperature are low. Two amplicon sequence variants matching this isolate had a circumpolar distribution in Tara Polar Ocean Circle samples, indicating its unusual light and temperature requirements are adaptations to life in a cold, dark environment. We expect this isolate's low light, psychrophilic niche to shrink as future warming‐induced stratification increases both light and temperature levels experienced by high latitude marine phytoplankton.