This Project Grant award from the National Science Foundation's Geosciences Program (CFDA 47.050) provides $315,954 to Portland State University to study the effects of microbial cell surface properties on predation in marine ecosystems. The research aims to quantify how cell surface modifications influence predator-prey interactions within the microbial loop, which is critical for understanding carbon fate and nutrient cycling in the ocean. The project involves laboratory experiments using artificial microspheres with varying surface properties to determine selectivity by suspension feeders, as well as analysis of microbial taxa in the guts of wild-caught predators. This integrated approach will generate foundational knowledge to improve ocean food web models. The award also supports public engagement activities, such as museum exhibits and workshops, and the training of graduate and undergraduate students, including underrepresented minorities, in this area of ocean science research.