In the modern Maya Lowlands, ?Dwax is well correlated with precipitation amount and varies by 60? across an annual precipitation gradient of 2,500 mm (Fig. 2).

This modern variability in dDwax is strongly influenced by soil water evaporation (17), and it is possible that changes in potential evapotranspiration could also impact paleo records.

Physiological differences between plant groups also result in differing ?Dwax values between C3 trees and shrubs and C4 grasses (16), and we use ?13Cwax records to correct for the influence of vegetation change on ?Dwax values (25) (?Dwax-corr, SI Text and Fig. S1).

This modern variability in ?Dwax is strongly influenced by soil water evaporation (17), and it is possible that changes in potential evapotranspiration could also impact paleo records.

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