Based on mass balance theory and IsoSource program,stable carbon and nitrogen isotopic ratios revealed that small mammals (plateau pika,root vole and plateau zokor) contributed 26.8% and 27.0% and 29.2% to alpine weas...Based on mass balance theory and IsoSource program,stable carbon and nitrogen isotopic ratios revealed that small mammals (plateau pika,root vole and plateau zokor) contributed 26.8% and 27.0% and 29.2% to alpine weasel,steppe polecat and upland buzzard of carnivores as food respectively;adult passerine birds contributed 22.3%,47.7% and 69.1%,with hatchlings contributing 50.9%,25.6% and 1.70% to each respectively.δ 13 C values plotted against δ 15 N indicated significant partitioning in two-dimensional space among the three carnivores.It was reasonable to propose a food resource partitioning among alpine weasel,steppe polecat and upland buzzard,which partially revealed their co-existence mechanisms.展开更多
美国土木工程师协会和美国采矿工程师协会地下工艺研究委员会年会(The ASCE-AIMEUnderground Technology Research Council)1988年9月23~25日美国土木工程师协会和美国采矿工程师协会在美国科罗拉多州丹佛联合召开了地下工艺研究委员...美国土木工程师协会和美国采矿工程师协会地下工艺研究委员会年会(The ASCE-AIMEUnderground Technology Research Council)1988年9月23~25日美国土木工程师协会和美国采矿工程师协会在美国科罗拉多州丹佛联合召开了地下工艺研究委员会年会。在9月22日和23日组织了两次现场旅行,其一。展开更多
文摘Based on mass balance theory and IsoSource program,stable carbon and nitrogen isotopic ratios revealed that small mammals (plateau pika,root vole and plateau zokor) contributed 26.8% and 27.0% and 29.2% to alpine weasel,steppe polecat and upland buzzard of carnivores as food respectively;adult passerine birds contributed 22.3%,47.7% and 69.1%,with hatchlings contributing 50.9%,25.6% and 1.70% to each respectively.δ 13 C values plotted against δ 15 N indicated significant partitioning in two-dimensional space among the three carnivores.It was reasonable to propose a food resource partitioning among alpine weasel,steppe polecat and upland buzzard,which partially revealed their co-existence mechanisms.
文摘美国土木工程师协会和美国采矿工程师协会地下工艺研究委员会年会(The ASCE-AIMEUnderground Technology Research Council)1988年9月23~25日美国土木工程师协会和美国采矿工程师协会在美国科罗拉多州丹佛联合召开了地下工艺研究委员会年会。在9月22日和23日组织了两次现场旅行,其一。