84. Greenwood, R. J., A. B. Sargeant, D. H. Johnson, L. M. Cowardin, and
T. L. Shaffer. 1982. Mallard nest success and recruitment in prairie Canada.
Transactions of the North American Wildlife Natural Resources Conference 52:298-309.
Nests of mallards (Anas platyrhynchos) that were abandoned within
a few days after discovery were considered to be investigator-influenced and
were not used to measure survival in this paper.