| 杜桂林,洪军,王勇,林荣凤,于成,哈斯其木格,焦玉斌,关其格.2016.布氏田鼠秋季家群数量与捕食风险的关系.动物学杂志,51(2):176-182. |
| 布氏田鼠秋季家群数量与捕食风险的关系 |
| The Predation Risk of the Brandt’s Vole Related to the Group Sizes of Communal Over-Winter Nests |
| 投稿时间：2015-05-29 修订日期：2015-08-17 |
| DOI：DOI: 10.13859/j.cjz.201602002 |
| 中文关键词: 布氏田鼠 越冬家群数量 捕食风险 艾虎 |
| 英文关键词:Lasiopodomys brandtii Over-winter group size Predator risk Mustela eversmanni |
| 基金项目:公益性行业科研专项201203041 |
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| 中文摘要: |
| 2004年9月25日-10月15日,作者在内蒙古锡林郭勒盟阿巴嘎旗白音图嘎苏木研究了秋季布氏田鼠家群数量与基于来自艾虎的捕食风险。布氏田鼠家群数量调查采用标志重捕法和MNA法确定,而艾虎对布氏田鼠的捕食风险的衡量指标采用研究期间在布氏田鼠洞群区新出现的艾虎粪便和挖掘痕迹。研究区面积4公顷,涉及91个布氏田鼠家群,658只布氏田鼠,其中17个布氏田鼠家群有新出现的艾虎粪便,5个家群被艾虎掘开。运用非参数的Mann-Whitney U 检验法进行数据分析,结果显示：从艾虎遗留的粪便痕迹来看,未出现艾虎粪便的布氏田鼠家群总秩和为1096,出现艾虎粪便的田鼠洞群秩和为3090,统计量U = 315,校正Z = ?3.241,校正P = 0.0012；另外从艾虎掘开的田鼠家群来分析,没有被艾虎挖掘的布氏田鼠家群秩和为3757,而被艾虎掘开的田鼠家群秩和为429,统计量U = 16,校正Z值为?3.514,P = 0.0004。两组差异达到极显著的水平,表明艾虎对秋季高数量的布氏田鼠家群具有显著的优先访问和攻击偏好,也意味着高数量的布氏田鼠秋季家群面临更高的来自艾虎的被捕食风险。 |
| 英文摘要: |
| Group sizes of Brandt’s vole ( Lasiopodomys brandtii )overwintering colonies could affect colonies’ predation risks. We studied how the different group sizes of Brandt’s vole affect the predation preference in Xilinguole typical steppe, Inner Mongolia, Abagaqi Centre from September 25 to October 15, 2014. Meanwhile, we tested the effect of the predation preference of the steppe polecat (Mustela eversmanni) on the group size of the Brandt’s vole within the sampling area. Recapture method and MNA method were used to estimate the Brandt’s family quantity. Meanwhile, both the amount of feces of the steppe polecat and holes dig by the steppe polecat within the ground of each Brandt’s vole colony was recorded as the indicator of its predation preference. 91 colonies of Brandt’s voles and 658 Brandt’s were observed within the sampling area, among them 17 Brandt's vole has new feces, 5 Brandt's vole were dug by the steppe polecat (the sampling area is 4hm2) . Then the Mann-Whitney U of nonparametric was used to analyze the data. The results show that the rank sum of the colonies where no feces of the polecat were recorded is 1096, while that of the colonies with feces records is 3090 (U value = 315, Adjusted Z Value = ?3.241, Adjusted P Value = 0.0012); At the same time, the rank sum of the colonies whose holes were dug by the polecat is 429, comparing with the colonies no dig , the rank sum is 3757 (U value = 16, Adjusted Z Value = ?3.514, Adjusted P Value = 0.0004).This suggests that the difference between the two groups of colonies is significant. This difference indicates that the steppe polecat significantly prefers to high number of group sizes of Brandt's vole colonies, they tend to spend longer time around the colonies with more holes, some of them even tried to dig those colonies to hunt, therefore, more feces and excavation trails can be found around the ground of those colonies .This finding indicates that the colonies with larger size result into a higher predator risk. |
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