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.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-0415102-112656 |
| Date | 16 April 2002 |
| Creators | Oetgen, Jesse G. |
| Contributors | Michael J. Chamberlain, Frank C. Rohwer, E. Barry Moser |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-0415102-112656/ |
| Rights | unrestricted, I hereby grant to LSU or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation. |
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