Carbon (δ13C) and nitrogen (δ15N) isotope data from bone collagen from archaeological fauna and modern plants in the isthmus area, including Costa Rica and Panama.

Norr’s [105] modern plant δ13C values have been adjusted here by +1.5‰ to account for the Suess effect [176], as she specified that her reported values were not corrected for the difference between preindustrial and modern decrease in 13CO2 (vs 12CO2) due to the burning of fossil fuels. (XLSX)