Postdocs Kiefer ForschTrace Metal Ratios and Isotopes as Tracers of Soluble and Particulate Matter Sources and Cycling.Diatom Trace Metal Quotas as a Function of Nutrient Availability. Benjamin Granzow Biological Transformation of Terpenoids Organic Matter Cycling and Reactivity Natalie Posdaljian Passive Acoustic Monitoring of Marine Mammals as Ecosystem Sentinels Impacts of Climate Change on Marine Mammal Behavior and Distribution