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INHS Bulletin vol.27:6PDF

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Title:Sex Ratios and Age Ratios in North American Ducks
Author(s):Bellrose, Frank Chapman; Scott, Thomas G.; Hawkins, Arthur Stuart; Low, Jessop B.
Subject(s):Waterfowl
Sex Ratio
Age Ratio
North America
Abstract:MANAGEMENT of waterfowl includes the intelligent manipulation of their populations. The sex classes and age classes of various species of ducks constitute measurable elements of the populations. The present study deals primarily with sex ratios and age ratios and the ways in which they relate to population productivity. Nearly three decades ago Leopold (1933:165-6) wrote: "All measurements of either game population or game productivity are enhanced in their significance and value if the sex and age as well as the number of individuals be determined."
Issue Date:1961-08
Publisher:Champaign : Illinois Natural History Survey
Series/Report:Illinois Natural History Survey Bulletin; v. 027, no. 06
Genre:Article
Type:Text
Language:English
URI:http://hdl.handle.net/2142/44089
ISSN:0073-4918
Publication Status:published or submitted for publication
Peer Reviewed:is peer reviewed
Rights Information:Copyright 2009 University of Illinois Board of Trustees. All rights reserved.
Date Available in IDEALS:2013-05-24


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