Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 240
... young and of yearlings ( Table 6 , Fig . 1 ) increased greatly over the years . An unharvested population normally has about 30 percent yearlings in the spring . However , as animals were removed , the proportion of young and yearlings ...
... young and of yearlings ( Table 6 , Fig . 1 ) increased greatly over the years . An unharvested population normally has about 30 percent yearlings in the spring . However , as animals were removed , the proportion of young and yearlings ...
Стр. 241
... young recaptured in Area D did show an increase in each of the three years . The higher recapture rate of young in Area C probably resulted from either greater survival or less emigration or both , suggesting that compensatory factors ...
... young recaptured in Area D did show an increase in each of the three years . The higher recapture rate of young in Area C probably resulted from either greater survival or less emigration or both , suggesting that compensatory factors ...
Стр. 243
... young to rise to 40. The increase in the percentage of young results in part from an increase in survival and in part from immigration of young into the area . Increased survival is indicated ( Table 7 ) by a difference in the ...
... young to rise to 40. The increase in the percentage of young results in part from an increase in survival and in part from immigration of young into the area . Increased survival is indicated ( Table 7 ) by a difference in the ...
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PERSPECTIVES | 1 |
Thinking like a mountain | 9 |
Lost margins in the abandoned farm | 19 |
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Readings in Wildlife Conservation James Allen Bailey,William Elder,Ted D. McKinney Просмотр фрагмента - 1974 |
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acres adult agencies animals annual areas Barbary sheep behavior big game biological biologists birds black-tailed deer breeding burning Canada Canada geese caribou carrying capacity changes chaparral conservation cost crop Dall sheep diversity ecological economic ecosystem effects environment example exotic experience factors farm fertility Fish and Game fish and wildlife forage forest game management geese goose groups grouse growth habitat harvest herd hunters hunting important increase individual kill land Leopold limited living mallards marshes ment method Mississippi Flyway moose mortality muskrats National Park natural organic Park Service percent plants population density prairie predation problem production quail recreation refuge reproductive result ruffed grouse season seed sharecropping shrubland social soil species sport square miles succession territory tion types ungulates unit vegetation waterfowl white-tailed deer wild Wildl wildlife management wildlife resources winter range wolf wolves