Julie Keister is an oceanographer who looks at the many ways that climate-driven changes in the marine environment can affect zooplankton. She takes a varied approach to her research, using a combination of field studies, laboratory work, and remote-sensing data. She is especially interested in how large-scale changes in ocean circulation affect zooplankton distributions. She is also looking at how ocean acidification affects the early life stages of zooplankton and how hypoxia (that is, low oxygen environments) affects trophic linkages between fish and zooplankton in food webs of the Pacific Northwest.