Fig. 3

Lipid and bulk isotopic composition of the organic matter in the six sediment samples from the Laguna Lejía terrace. a Total organic carbon (TOC) and stable-carbon isotopic ratio (δ13C). b Total nitrogen (TN) and stable-nitrogen isotopic ratio (δ15N). TN concentration was not detected in samples B and D. c Composition of the three polarity fractions of lipids (non-polar, blue color shades; acidic, red color shades; and polar, green color shades). Error bars represent the standard deviation of triplicates. Error bars in δ13C are behind the dots and are smaller than the dots’ size