香鼬、艾虎和大(狂鸟)的食物资源分割--来自稳定性同位素的证据 |
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引用本文: | 易现峰.香鼬、艾虎和大(狂鸟)的食物资源分割--来自稳定性同位素的证据[J].动物学研究,2005,26(1):1-7. |
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作者姓名: | 易现峰 |
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作者单位: | 易现峰 (河南科技大学,农学院,河南,洛阳,471003中国科学院西北高原生物研究所,青海,西宁,810001中国科学院动物研究所,北京,100080); |
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摘 要: | 通过对高寒草甸生态系统内香鼬、艾虎和大(狂鸟)3种食肉类稳定性碳和氮同位素比值(δ13C和δ15N)的测定,依据同位素的质量平衡原理和IsoSource软件计算得到:小型哺乳类在香鼬、艾虎和大(狂鸟)食谱中的分配比例分别为26.8%、27.0%和29.2%;雀形目成鸟的分配比例为22.3%、47.7%和69.1%;雀形目幼鸟为50.9%、25.6%和1.70%.3种食肉类的稳定性碳和氮同位素分布模式在二维空间上存在明显分割,由此说明,香鼬、艾虎和大(狂鸟)之间存在明显的食物资源分割现象,同时也反映了三者在高寒草甸生态系统内共存的基础.
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关 键 词: | 香鼬 艾虎 大(狂鸟) 稳定性同位素 食物 资源分割 |
Food Resource Partitioning in Alpine Weasel,Steppe Polecat and Upland Buzzard:Evidence from Stable Isotope Ratios |
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Abstract: | 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.δ13C values plotted against δ15N 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. |
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Keywords: | Alpine weasel Steppe polecat Upland buzzard Stable isotope Food Resource partitioning |
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