Readings in Wildlife ConservationJames Allen Bailey, William Elder, Ted D. McKinney Wildlife Society, 1974 - Всего страниц: 722 |
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Стр. 193
... groups which maintain their integrity restricts the utilization of space . - Local colonies or aggregates were ... groups the frequency of conception is high , and most of the young born are successfully raised . On the contrary , among ...
... groups which maintain their integrity restricts the utilization of space . - Local colonies or aggregates were ... groups the frequency of conception is high , and most of the young born are successfully raised . On the contrary , among ...
Стр. 227
... group , and vice versa ; groups can fluctuate in time within the range of 2-10 birds without change of boundary . The upper limit of territory size is , by observation , the largest area that the group can obtain and hold effectively ...
... group , and vice versa ; groups can fluctuate in time within the range of 2-10 birds without change of boundary . The upper limit of territory size is , by observation , the largest area that the group can obtain and hold effectively ...
Стр. 228
... groups usually consist of adult birds only . 3 ) Mobile groups commute between a separate feeding area in the open and a nesting - roosting area among trees . The latter is held against the strong opposition of neighboring groups , and ...
... groups usually consist of adult birds only . 3 ) Mobile groups commute between a separate feeding area in the open and a nesting - roosting area among trees . The latter is held against the strong opposition of neighboring groups , and ...
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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