Hoiss B., Krauss J., Potts S.G., Roberts S., Steffan-Dewenter I. (2012) Altitude acts as an environmental filter on phylogenetic composition, traits and diversity in bee communitiesProceedings of the Royal Society B: Biological Sciences 279: 44474456. http://rspb.royalsocietypublishing.org/content/279/1746/4447/suppl/DC1