We thank Michael D. Schwartz and especially Marsha A.
Sovada for review of literature; Kenneth J. Reinecke for use
of his extensive waterfowl bibliography; Ann S. Zimmerman
for library assistance; Albert T. Klett for use of
unpublished data on Mallard clutch sizes; and Daniel W.
Anderson, James C. Bartonek, Douglas H. Johnson, Gary L.
Krapu, Rolf R. Koford, Donald H . Rusch, and Pamela J.
Pietz for helpful review of portions or all of manuscript
drafts.
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