Northern Prairie Wildlife Research Center
Table 1. Components of the model. Each assumes a value for each year t (index omitted).
| F | Spring population of red fox families |
| PM | Spring population of male mallards |
| PF | Spring population of female mallards |
| SM | Number of male mallards surviving year |
| SF | Number of female mallards surviving year |
| FM | Number of male mallards taken by foxes |
| FF | Number of female mallards taken by foxes |
| OM | Number of male mallards suffering "other" mortality in summer |
| OF | Number of female mallards suffering "other" mortality in summer |
| HM | Number of male mallards suffering hunting mortality |
| HF | Number of female mallards suffering hunting mortality |
| WM | Number of male mallards suffering "other" mortality in winter |
| WF | Number of female mallards suffering "other" mortality in winter |
| RM | Recruitment of male mallards |
| RF | Recruitment of female mallards |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/mammals/sexratio/table1.htm
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