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jzo12071-sup-0001-figs.doc116K

Figure S1. Histograms of expected and observed sharing of excavation behavior of pairs of Pogonomyrmex barbatus queens in (a) 2011 and (b) 2012. A value of 0 indicates excavation was performed solely by one queen, while a value of 1 indicates equal task performance. Because nests were not observed for the same total duration in the two years (see Methods), results for each year were analyzed separately. Expected frequencies were generated by randomly pairing excavation data from control queens excavating nests alone, sampled with replacement. Median excavation sharing in observed pairs was significantly lower than expected in both years (2011: predicted median = 0.55, observed median = 0.19, P < 0.01; 2012: predicted = 0.44, observed = 0.27, P < 0.05).

jzo12071-sup-0001-figs.doc116K

Figure S2. Histogram of expected and observed distribution of reproductive sharing between paired queens, pooled over the two years. Expected values were generated by randomly sampling with replacement and pairing two productivity values from the set of control single queen nests one hundred times. Median reproductive sharing in observed pairs was significantly lower than expected (predicted median = 0.60, observed median = 0.40, P < 0.01).

jzo12071-sup-0002-texts1.txt2K

Text S1. Custom python script for generating an expected distribution of LF/HF values under the null hypothesis that all task asymmetry is due to intrinsic variation in task performance. Comments explaining individual lines of code are indicated with a # sign.

jzo12071-sup-0003-texts2.txt2K

Text S2. Custom python script for running a randomization test comparing the observed median LF/HF value to the null distribution. The randomization test calculates a distribution of medians derived from 1000 simulated datasets of identical sample size to the observed data, drawn at random from the expected distribution of LF/HF values if all task asymmetry were caused by intrinsic variation in task performance. Observed medians falling below the bottom 5% of the expected medians indicate significantly amplified division of labor for the focal task. Comments explaining individual lines of code are indicated with a # sign.

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