Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 671
... harvest . Second , catch size declines with harvest rates that adjust breed- ing - stock size to levels above or below the size where the maximum catch is obtained . Hence , if breeding - stock size is changed from some value where a ...
... harvest . Second , catch size declines with harvest rates that adjust breed- ing - stock size to levels above or below the size where the maximum catch is obtained . Hence , if breeding - stock size is changed from some value where a ...
Стр. 715
... Harvest of Canada Geese in Wisconsin and Illinois WISCONSIN Season Year Quota Zone * Length ( Days ) Statewide Harvest Season Length 1960 10,900 9/2 Unknown 70 1961 11,141 101⁄2 Unknown 60 1962 7,093 72 Unknown 60 1963 12,746 35/2 ...
... Harvest of Canada Geese in Wisconsin and Illinois WISCONSIN Season Year Quota Zone * Length ( Days ) Statewide Harvest Season Length 1960 10,900 9/2 Unknown 70 1961 11,141 101⁄2 Unknown 60 1962 7,093 72 Unknown 60 1963 12,746 35/2 ...
Стр. 720
... harvest ( Geis and Carney , 1966 ) : Year Quota for Horicon Zone 1963 12,000 1964 11,000 1965 11,000 Calculated State- wide Kill 20,300 25,400 31,800 These figures would be larger if associated crippling loss were included . The tail ...
... harvest ( Geis and Carney , 1966 ) : Year Quota for Horicon Zone 1963 12,000 1964 11,000 1965 11,000 Calculated State- wide Kill 20,300 25,400 31,800 These figures would be larger if associated crippling loss were included . The tail ...
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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