The winning paper is "Site-occupancy monitoring of an ecosystem indicator: linking characteristics of riparian vegetation to beaver occurrence" by Stewart W. Breck, Michael I. Goldstein, and Sanjay Pyare (WNAN 72:432–441).
"Outstanding Natural History Paper of 2012,"
Western North American Naturalist: Vol. 73
, Article 15.
Available at: http://scholarsarchive.byu.edu/wnan/vol73/iss4/15