Nestmate Recognition Differences between Honeybee Colonies of <Emphasis Type="BoldItalic">Apis cerana</Emphasis> and <Emphasis Type="BoldItalic">Apis mellifera</Emphasis>

Nestmate recognition in Apis cerana and Apis mellifera was studied by introducing sealed queen cells heterospecifically between queenless colonies. No A. cerana queens were accepted by queenless A. mellifera; but A. mellifera queens were accepted in queenless A. cerana colonies. A. mellifera queens oviposited in queenless A. cerana colonies, but A. cerana workers removed most eggs. In time, egg removals declined, and some A. mellifera larvae that hatched from these eggs reached adulthood, and eventually about half of the workers were newly emerged A. mellifera. Eventually, the colonies consisted only of A. mellifera after A. cerana workers died by attrition. A. mellifera workers are more sensitive to nestmate recognition and killed the A. cerana virgin queens. In mixed-species colonies, after newly emerged A. mellifera workers matured, they removed eggs laid by the A. cerana queens until there were no workers to replace the old ones.