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2005年9月15日—30日,在内蒙古锡林郭勒盟西乌珠穆沁旗的典型草原上研究了狭颅田鼠(Microtus gregalis)冬季集群与来自艾虎(Mustela eversmanni)的捕食风险。采用鼠洞口数量作为狭颅田鼠集群大小的指标,分析了艾虎对不同大小狭颅田鼠集群的捕食优先选择偏好。对实验样地内狭颅田鼠的洞群洞口数进行了调查统计(样地内总共涉及102个狭颅田鼠有效洞群),并计数此期间的艾虎粪便堆数以及攻击掘开狭颅田鼠洞群的情况。运用非参数的Mann-Whitney U检验法进行数据分析,结果表明:从艾虎遗留的粪便痕迹来看,没有被艾虎访问过的田鼠洞群与被艾虎访问过的洞群之间差异达到极显著水平;另外,从狭颅田鼠洞口被艾虎掘开的痕迹来分析,没有被艾虎挖掘的洞群与被艾虎挖掘的洞群之间的差异也达到极显著的水平;另外,随着田鼠洞群洞口数量的增加,出现艾虎粪便和掘洞的频次和概率就越高。表明艾虎对狭颅田鼠集群洞口数的选择差异性非常显著,明显倾向于选择在洞口数量多的狭颅田鼠洞群停留,同时也更倾向于掘开洞口数量较高的狭颅田鼠洞群作为捕食对象。
From September 15 to September 30, 2005, the winter population of Microtus gregalis and the predation risk from Mustela eversmanni were studied in the typical steppe of West Ujimqin Qin Banner, Xilinguole, Inner Mongolia. Using the number of mouse holes as an index of the size of the vole cluster, the preference preference of the predatory prey on the vole populations of different sizes was studied. A total of 102 cave-hole voles in the sample field were surveyed (total of 102 cave-voles valid voles) in the experimental plots. The number of AI-Ti manure stools during this period and the number of cave-eyed voles Happening. The non-parametric Mann-Whitney U test was used to analyze the data. The results showed that there was a significant difference between the voles that had not been visited by Ai Hu and the caves visited by Ai Hu ; In addition, from the narrow crested voles holes to be evacuated by Ai Hu to analyze the traces, there is no A tiger excavated hole groups and the holes were digging tiger group also reached a significant difference between the level; In addition, with the hole group hole The higher the number, the higher the frequency and probability of emergence of Ai Hu excrement and burrowing. The results showed that the difference of the number of holes in the vole population was very significant, and it was obviously inclined to stay in the crested vole in a large number of holes. At the same time, Predator.