Abstract
Observations were made on Lasioglossum zephyrum colonies containing from one to 17 workers. In experiment I, the most dominant workers in larger colonies exhibited more queen-like characteristics in their interactions with nestmates than did those in smaller colonies. In experiment II, a higher proportion of workers in large than in small colonies were willing to mate with males. These results are consistent with the hypothesis that the queen's ability to suppress queen-like behaviour in workers declines with increasing colony size.
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