Impact of recent lake eutrophication on microbial community changes as revealed by high resolution lipid biomarkers in Rotsee (Switzerland)

► Effect of eutrophication on microbial community changes examined. ► Reconstruction to species level via biomarker and microbial data. ► New terrestrial proxy, changed BIT index (BITCH). ► Diatom species as dominant specific lipid source recognised. ► Estimation of methanogen cell density and average GDGTs/cell value.