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Difference in stable carbon isotope ratios between available nutrients (δ13Csource; ‰) and exhaled breath (δ13CV-PDB; ‰) of eight Pipistrellus nathusii that had repeatedly fed on mealworms over 100 min. Box margins indicate the 25 and 75 percentiles, and the solid lines within the boxes the median. The dashed line indicates when exhaled breath and nutrient have the same δ13C value. p-values indicate significant differences between nutrient δ13CV-PDB and breath δ13CV-PDB.
