Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central Andean Altiplano during the Lateglacial and Early Holocene

► First δ13Cdiatom record from South America and only the third ever from a lake. ► First to look at decadal scale changes in the lake carbon cycle. ► Adds to growing understanding of δ13C in a lake with authigenic carbonate. ► Coupling of carbon cycle to palaeohydrology with links to ENSO. ► Laminated sediments show that carbon supply and demand can change rapidly.