Stable isotope values (δ18O & δ13C) of multiple ostracode species in a large Neotropical lake as indicators of past changes in hydrology

► First modern stable isotope measurements of multiple ostracode species from Lago Petén Izá, Guatemala. ► Relationship between ostracode autecology and stable isotopes. ► Quantification of the stable isotope vital offsets of multiple ostracode species. ► Reconstruction based on modern and fossil ostracode stable isotopes and modern and past lake hydrodynamics. ► We report late Pleistocene-early Holocene dramatic environmental changes and an averaged lake level fluctuation of ∼25 m.