Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 50
... bird populations is incomplete except for certain game birds and even here our knowledge can be improved upon . Without such knowledge we cannot forecast and prepare for likely changes in bird populations coming out of a more intensive ...
... bird populations is incomplete except for certain game birds and even here our knowledge can be improved upon . Without such knowledge we cannot forecast and prepare for likely changes in bird populations coming out of a more intensive ...
Стр. 52
... birds may undergo undesirable alteration . Industrial pollution may cause direct loss as in the case at Lake Calumet , Illinois , where severe loses among migrating shore birds in fall have been traced to soluble lead . A reliable basis ...
... birds may undergo undesirable alteration . Industrial pollution may cause direct loss as in the case at Lake Calumet , Illinois , where severe loses among migrating shore birds in fall have been traced to soluble lead . A reliable basis ...
Стр. 80
... birds and his love of " sport . " Many , perhaps most professional students find no reason too trivial to " collect ... birds of paradise , the 40,000 humming - birds , and the 30,000 birds of other species said to have been killed to ...
... birds and his love of " sport . " Many , perhaps most professional students find no reason too trivial to " collect ... birds of paradise , the 40,000 humming - birds , and the 30,000 birds of other species said to have been killed to ...
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