Title page for ETD etd-0415102-112656

Type of Document Master's Thesis
Author Oetgen, Jesse G.
Author's Email Address joetgen@yahoo.com
URN etd-0415102-112656
Title Effects of Repeat Sampling in the U.S. Waterfowl Parts Collection Survey
Degree Master of Science (M.S.)
Department Forestry, Wildlife, and Fisheries
Advisory Committee
Advisor Name Title
Frank C. Rohwer Committee Chair
E. Barry Moser Committee Member
Michael J. Chamberlain Committee Member
  • parts collection survey
  • mallard
  • harvest
  • duck production
  • age ratios
  • sex ratios
Date of Defense 2002-03-28
Availability unrestricted
Age ratio estimates obtained annually by the Cooperative Waterfowl Parts Collection Survey (PCS) serve as important estimates of annual waterfowl recruitment. To determine if age and sex ratios are biased due to repeat sampling of hunters across years, I examined PCS data collected from 1991-2000. Mean seasonal harvest increased with number of consecutive years hunters responded to the PCS. Proportions of juveniles in the mallard (Anas platyrhynchos) harvest and harvest of all species combined decreased with increasing seasonal harvest level. Proportions of males in the harvest increased with increasing harvest level. Proportions of juveniles in the harvest of hunters responding to the PCS 3 and 4 consecutive years were slightly lower than proportions in the harvest of hunters responding only once or twice. Proportion of males in the mallard harvest increased with number of years hunters remained in the PCS. Although large sample sizes produced statistically significant effects (P < 0.05) of seasonal harvest and repeat sampling, actual differences in predicted proportions were quite small. My results suggest that age and sex ratio estimates remain relatively unaffected by repeat sampling in the PCS.
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