Honey bee guards, Apis mellifera, accept own subspecies non-nestmates more than other subspecies non-nestmates
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Honey bee nest entrance guards accepted a significantly lower proportion of non-nestmates of a different subspecies (5 %) than non-nestmates of their own subspecies (18 %). This result was consistent for 5 of the 6 study colonies (the sixth rejected all non-nestmates), 3 each of Apis mellifera mellifera and A.m. ligustica, and for each subspecies of guards (A.m.m. 5 % v 17 %; A.m.l. 4 % v 20 %). These data indicate that there are consistent recognition cue differences across subspecies.