University of Illinois Urbana-Champaign

Sex Ratios and Age Ratios in North American Ducks

Bellrose, Frank Chapman; Scott, Thomas G.; Hawkins, Arthur Stuart; Low, Jessop B.

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https://hdl.handle.net/2142/44089

Description

Title
Sex Ratios and Age Ratios in North American Ducks
Author(s)
  • Bellrose, Frank Chapman
  • Scott, Thomas G.
  • Hawkins, Arthur Stuart
  • Low, Jessop B.
Issue Date
1961-08
Keyword(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."""
Publisher
Champaign : Illinois Natural History Survey
Series/Report Name or Number
Illinois Natural History Survey Bulletin; v. 027, no. 06
ISSN
0073-4918
Type of Resource
text
Language
en
Permalink
http://hdl.handle.net/2142/44089
Copyright and License Information
Copyright 2009 University of Illinois Board of Trustees. All rights reserved.

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