highly significantP < 2.2 × 10 −16
ponticus worker (average of 0.00186, range from 0.0002 to 0.0024) versus all other individuals which have very close to zero γ values (average of 1.86 × 10 −6 , range from 6.598 × 10 −7 to 6.461 × 10 −6 ), with a highly significant difference (two-sided Wilcoxon rank-sum test, P < 2.2 × 10 −16 ).