Papers in the Biological Sciences


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Published in Review of Sex Ratios and Age Ratios in North American Ducks by Bellrose, Scott & Low. Johnsgard in the AUK (1962) v. 79. Copyright 1962, University of California and American Ornithologists' Union. Used by permission.


This bulletin is by far the most elaborate and comprehensive of any of the publications dealing with waterfowl age and sex ratios that have appeared to date, and represents the presentation and analysis of sex and age ratio data accumulated by the Illinois Natural History Survey over the last 24 years. The several people concerned are to be congratulated for bringing this material into publishable form, and it is commendable that the National Science Foundation undertook the printing costs of this extensively tabulated and illustrated bulletin.

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