Figures
Figure 1. Map of sampled nests within each field site. Nests treated with an isotope tracer are labeled as “0” within each cluster. Dark grey circles indicate that worker isotope values increased after two weeks of treatment (i.e., \(\delta\)15N values of workers were greater than 20‰), whereas light grey circles indicate that isotope values did not change (mean natural abundance\(\delta\)15N values before tracer treatment: 5.00‰ ± 0.15‰). The social form according to Gp-9 results (P = polygyne; M = monogyne), as well as within-nest relatedness are specified for each mound.