Table 1.

Mean cumulative percent mortality (±st dev) in L. humile workers exposed to a single fipronil-treated nestmate.

Treatment	Colony size	Time (hours)
		2	4	8	16	24	48	72	96
control	100 workers	0 ± 0 a, a	0 ± 0 a, a	0 ± 0 a, a	1 ± 1 a, a	3 ± 1 a, a	5 ± 1 a, a	6 ± 2 a, a	6 ± 2 a, a
control	250 workers	0 ± 0 a, a	0 ± 0 a, a	0 ± 0 a, a	0 ± 0 a, a	1 ± 0 a, a	1 ± 1 a, a	2 ± 1 a, a	2 ± 1 a, a
control	500 workers	0 ± 0 a, a	0 ± 0 a, a	0 ± 0 a, a	0 ± 0 a, a	1 ± 0 a, a	2 ± 0 a, a	3 ± 0 a, a	3 ± 0 a, a
fipronil	100 workers	0 ± 0 a, a	0 ± 0 a, a	8 ± 1 a, a	27 ±± 5 b, a	100 ± 0 b, a	100 ± 0 b, a	100 ± 0 b, a	100 ± 0 b, a
fipronil	250 workers	0 ± 0 a, a	0 ± 0 a, a	9 ± 3 ab, a	19 ± 5 b, b	86 ± 6 b, b	98 ± 3 b, a	100 ± 0 b, a	100 ± 0 b, a
fipronil	500 workers	0 ± 0 a, a	0 ± 0 a, a	5 ± 2 a, a	9 ± 1 ab, c	42 ± 3 b, c	55 ± 4 b, b	59 ± 3 b, b	61 ± 3 b, b

Means followed by the same letter are not significantly different (P ≤ 0.05) by Tukey’s HSD test. First letter indicates comparisons across treatments (control vs. fipronil), second across colony sizes within a treatment.