Colonies with genetically diverse populations of workers benefited from greater microbial diversity, reduced pathogen loads, and increased abundance of putatively helpful bacteria Characterization of the active microbiotas associated with honey bees reveals healthier and broader communities when colonies are genetically diverse,
PLoS ONE
, Volume 7, Number 3, p.e32962, (2012)
[1].

See also:
http://www.eurekalert.org/pub_releases/2012-03/wc-wdp030712.php
http://www.pctonline.com/IU-bee-diversity-research.aspx
http://www.redorbit.com/news/science/1112493332/promiscuous-bee-queen-e…