Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 478
... become larger as more powerful farm implements become available to him ; irregularities and obstructions are eliminated from his fields ; he no longer needs a woodlot for fuel and posts ; weeding and insect control through pesticides ...
... become larger as more powerful farm implements become available to him ; irregularities and obstructions are eliminated from his fields ; he no longer needs a woodlot for fuel and posts ; weeding and insect control through pesticides ...
Стр. 478
... become larger as more powerful farm implements become available to him ; irregularities and ob- structions are eliminated from his fields ; he no longer needs a woodlot for fuel and posts ; weeding and insect control through pesticides ...
... become larger as more powerful farm implements become available to him ; irregularities and ob- structions are eliminated from his fields ; he no longer needs a woodlot for fuel and posts ; weeding and insect control through pesticides ...
Стр. 670
... becomes , sooner or later , simply inefficient . Hence , the farther we move to the right in the figure , the smaller ... become small ( Fig . 1 ) . The extended relation between breeding - stock size and catch size indicated in Fig . 1 ...
... becomes , sooner or later , simply inefficient . Hence , the farther we move to the right in the figure , the smaller ... become small ( Fig . 1 ) . The extended relation between breeding - stock size and catch size indicated in Fig . 1 ...
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 |
Часто встречающиеся слова и выражения
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