Figure 3. Very few untreated mounds shared with treated mounds,
regardless of social form. Plot includes the status of an isotope tracer
in untreated mounds by social form according to Gp-9 results.
Mounds with \(\delta\)15N values greater than 20‰
indicated that untreated mounds exchanged workers and/or resources with
the treated mound (“Shared with treated mound”), and the values of all
other mounds indicated that untreated mounds did not exchange workers or
resources with the treated mound (“Did not share with treated mound”).