Experiment 1: comparative resistance of individual antsThere was a significant interaction between the effects oftreatment and species on the survival of ants (Wald=20.9,df=3, P<0.001). Ants treated with the control solution hadlow mortality in all four species, and this was also true forF. fusca ants treated with the Metarhizium parasite (Fig. 1a).Mortality was significantly greater in both P. dives and M.ruginodis ants treated with Metarhizium, with there beingapproximately 65% mortality in both species, while therewas 100% mortality of A. echinatior workers exposed toMetarhizium (Fig. 1a). Metarhizium sporulated from 50% to95% of the cadavers of ants treated with Metarhizium, andfrom none of those treated with the control solution.Species differed significantly in their frequencies of selfgrooming(Wald χ2=184.9, df=3, P<0.001), but there wasno effect of treatment on this, with ants increasing theirgrooming to a similar extent in response to the controlsolution as to the parasite solution (Wald χ2=0.057, df=1,P=0.811). P. dives exhibited the most self-grooming,engaging in this at least 50% more than any other speciesand almost six times more often than A. echinatior(Fig. 1b).
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