Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 154
... breeding grounds , compressed the reproductive cycle into approxi- mately two thirds of the time used by resident birds . Subsequent investi- gation by a number of workers has demonstrated that the mechanism . triggering these events is ...
... breeding grounds , compressed the reproductive cycle into approxi- mately two thirds of the time used by resident birds . Subsequent investi- gation by a number of workers has demonstrated that the mechanism . triggering these events is ...
Стр. 671
... breeding - stock size is adjusted . In this manner , identical annual catches can be obtained from two different breeding - stock levels . Some deer and elk populations apparently conform , in terms of the net number of animals produced ...
... breeding - stock size is adjusted . In this manner , identical annual catches can be obtained from two different breeding - stock levels . Some deer and elk populations apparently conform , in terms of the net number of animals produced ...
Стр. 672
... breeding stock are equal , the population ceases to grow . The interaction of population size , births per unit of breeding stock , and deaths per unit of breeding stock will produce a dome - shaped net- population - production or yield ...
... breeding stock are equal , the population ceases to grow . The interaction of population size , births per unit of breeding stock , and deaths per unit of breeding stock will produce a dome - shaped net- population - production or yield ...
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