Carluvy Baptista-Salazar, Lic., in Chemistry, successfully defended her dissertation on "Biogeochemical cycling of mercury in contaminated forested systems: Species, isotope ratios and fluxes" on 6 December 2018. The thesis was written under the supervision of Prof. Dr. Harald Biester as part of the project "The Role of Fluid Exchange in Earth and Environmental Systems", which was funded by the state of Lower Saxony as a sub-project of the GEOFluxes graduate school. Her dissertation shows that studies focusing on the transport dynamics of particulate Hg and Hg species can contribute to a better understanding of Hg cycles and transformations in the vicinity of former Hg mining sites. The combination of stable Hg isotopes with Hg solid phase speciation provided new insights into potentially different Hg isotope compositions associated with Hg species transformation processes, rather than relying solely on Hg fingerprint-based contamination source localisation. Congratulations!