Fig 7. Atomic per cent excess in workers and larvae after a pulse of 13C and 15N isotopes. Workers became highly enriched rapidly (they collect the material) and then food was transferred to larvae by 96h. While not statistically significant, the atomic enrichment of 13C trends toward being higher in larvae at 96h while there is no pattern of difference in 15N; this is opposite what was predicted. This assay was carried out with a single diet (ML, Medium-Low) in a subset of Lasius neoniger colonies. Variation is expressed as confidence intervals.