Figure 3. Within-colony relatedness coefficients between workers of fire ants (Solenopsis invicta ) by social form from multiple populations. Data based on results extracted from the literature and results in the present study. Points and error bars (when available) represent mean ± SE. Ref 1 = Goodisman et al. (2007);Ref 2 = Ross (1993); Ref 3 = Ross and Fletcher (1985);Ref 4 = DeHeer and Ross (1997); Ref 5 = Henshaw et al. (2005); Ref 6 = Yang, Shoemaker, Wu, and Shih (2008); Ref 7 = Ross et al. (1996); Ref 8 = Ross et al. (1993).