Effects of Availability of Food and Interspecific Competition on Diets of Prairie Voles (Microtus ochrogaster)
Effects of Availability of Food and Interspecific Competition on Diets of Prairie Voles (Microtus ochrogaster)
复制标题
食物供应和种间竞争对草原田鼠（Microtus ochrogaster）饮食的影响
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
G. O. Batzli
中科院分区：
文献类型：
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作者：
A. E. Haken;G. O. Batzli
对实验种群的草原田鼠（Microtus ochrogaster）和草甸田鼠（Microtus pennaculicus）的粪便样本进行分析，发现它们的饮食有很大的重叠。这两个物种都喜欢双子叶植物，但草甸田鼠比草原田鼠吃更多的单子叶植物。为了检验种间食物竞争影响草原田鼠饮食的假设，我们研究了草原田鼠的饮食和没有草甸田鼠。我们发现显着更多的单子叶植物在草原田鼠的饮食时，草甸田鼠，但只有在初秋时，高品质的食物的可用性较低，密度的田鼠。我们的结论是，田鼠的饮食的变化可以发生作为一个响应的变化，在可用性的食物，食物质量，种间竞争，后者特别是当高品质的食物的可用性相对较低，密度的田鼠是相对较高的。
Analysis of fecal samples from experimental populations of prairie voles ( Microtus ochrogaster ) and meadow voles ( Microtus pennsylvanicus ) revealed that their diets strongly overlapped. Both species preferred dicots, but meadow voles ate significantly more mono-cots than did prairie voles. To test the hypothesis that interspecific competition for food influenced the diet of prairie voles, we examined the diets of prairie voles with and without meadow voles present. We found significantly more monocots in the diet of prairie voles when meadow voles were present, but only in early autumn when availability of high-quality food items was lower and densities of voles were higher. We conclude that variability in diets of voles can occur as a response to changes in availability of food, quality of food, and interspecific competition, the latter particularly when availability of high-quality food is relatively low and densities of voles are relatively high.