Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 359
... reduced to half its size in winter because of shortage of food and shelter aggravated by severe weather . Again , a dense population of musk- rats ( Ondatra zibethica ) may develop in summer only to be reduced later by a reduction in ...
... reduced to half its size in winter because of shortage of food and shelter aggravated by severe weather . Again , a dense population of musk- rats ( Ondatra zibethica ) may develop in summer only to be reduced later by a reduction in ...
Стр. 408
... reduced ; and by randomization each treatment is given the same chance to exert its effects . Then the total variation in the experiment can be par- titioned into that attributable to effects of the treatments ; to variations among the ...
... reduced ; and by randomization each treatment is given the same chance to exert its effects . Then the total variation in the experiment can be par- titioned into that attributable to effects of the treatments ; to variations among the ...
Стр. 709
... reduced the kill . In January , 1948 , 63,000 geese were censused ; the number in southern Illinois had increased 9,000 from the previous year . Besides land acquisition and management , a dispersal program was initiated at Horseshoe ...
... reduced the kill . In January , 1948 , 63,000 geese were censused ; the number in southern Illinois had increased 9,000 from the previous year . Besides land acquisition and management , a dispersal program was initiated at Horseshoe ...
Содержание
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