A field test for differences in condition among trapped and shot mallards
Journal of Wildlife Management
By: K. J. Reinecke and C.W. Shaiffer
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Abstract
We tested predictions from the condition bias hypothesis (Weatherland and Greenwood 1981) regarding the effects of sampling methods of body weights of mallards (Anas platyrhynchos) at White River National Wildlife Refuge (WRNWR), Arkansas, during 24 November-8 December 1985. Body weights of 84 mallards caught with unbaited rocket nets in a natural wetland were used as experimental controls and compared to the body weights of 70 mallards captured with baited rocket nets, 86 mallards captured with baited swim-in traps, and 130 mallards killed by hunters. We found no differences (P > 0.27) in body weight among sampling methods, but body condition (wt/wing length) of the birds killed by hunters was less (P < 0.02) than that of the controls. Power of the test statistics to reject the null hypothesis of equal body weights among sampling methods was > 0.75 for differences > 50 g. The condition bias hypothesis probably applies to ducks killed by hunters but not to trapping operations when substantial (> 20 at 1 time) numbers of birds are captured.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A field test for differences in condition among trapped and shot mallards |
| Series title | Journal of Wildlife Management |
| Volume | 52 |
| Issue | 2 |
| Year Published | 1988 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 227-232 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Wildlife Management |
| First page | 227 |
| Last page | 232 |
| Google Analytic Metrics | Metrics page |