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Humburg, D. D. , H. H. Prince and R. A Bishop. 1978. The social organization 

 of a Mallard population in northern Iowa. J. Wildl. Manage. 42: 72-80. 



Klint, T. 1978. Significance of mother and sibling experience for mating pre- 

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March, J. R. and R. A. Hunt. 1978. Mallard population and harvest dynamics in 

 Wisconsin. Wise. Dept. Nat. Resourc. Tech. Bull. No. 106: 1-74. 



Mather, T. E. 1978. Canada Goose takes over a Mallard nest. Wilson Bull. 90: 

 646-647. 



Midtgard, V. 1978. Resting postures of the Mallard Anas platyrhynchos . Ornis 

 Scand. 9: 214-219. 



Miller, D. B. and G. Gottlieb. 1978. Maternal vocalizations of Mallard Ducks 

 ( Anas platyrhynchos .) Anim. Behav. 26: 1178-1194. 



Molodovsky, A. V. and V. I. Bandura. 1978. [Estimation of food reserves and 

 summer feeding of the Anseriformes in the Sura River flood-plain in the 

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Nudds, T. D. 1978. Comments on Calverley and Boag's (1977) hypothesis on dis- 

 placed ducks and an evolutionary alternative. Can. J. Zool. 56: 2239-2241. 



Owen, M. and S. Montgomery. 1978. Body measurements of Mallard caught in 

 Britain. Wildfowl 29: 123-134. 



Pearce, R. B. , J. Cronshaw and W. N. Holmes. 1978. Evidence for the zonation 

 of interrenal tissue in the adrenal gland of the duck ( Anas platyrhynchos ). 

 Cell Tissue Res. 192: 363-379. 



Ranta, W. B. , F. D. Tomassini and E. Nieboer. 1978. Elevation of copper and 

 nickel levels in primaries from Black and Mallard ducks collected in the 

 Sudbury District, Ontario. Can. J. Zool. 56: 581-586. 



Storey, C. R. and T. J. Nicholls. 1978. Observations on the regulation of 



sexual quiescence in juvenile and adult male Mallard ( Anas platyrhynchos ). 

 J. Zool. (Lond.) 184: 181-186. 



Street, M. 1978. The role of insects in the diet of Mallard ducklings — an ex- 

 perimental approach. Wildfowl 29: 93-100. 



Szaro, R. C. , P. H. Aikers and N. C. Coon. 1978. Petroleum: effects on Mal- 

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