四川短尾鼩（Anourosorex squamipes)种群动态研究

四川短尾鼩(Anourosorex squmipes)的怀孕期在每年的4、7 、9月，种群数量高峰为6月和10～11月。其种群数量的消长可分为种群潜伏期(3-4月)、盛发期(6、8、9月)、始衰期(10-11月)、凋落期(12、1、2月)以及数量间歇期(7月)和繁殖间歇期(5月)。该兽在田间是以个体群为基础的聚集型分布格局，并有高密度时低聚集和低密度时高聚集的分布特征。

STUDY 0N THE P0PULATI0N DYNAMICS 0F ANOUROSOREX SQUAMIPES FROM SICHUAN PR0VINCE

Anourosorex squamipes Milne-Edwards is one of the dominant species of small mammals in Sichuan farmlands．Its population numbers varied with seasons in a year with two peaks，e．g．spring and autumn，the latter was a little higher than the former．The increasing and decreasing rules of population number in a year were divided into five periods, that is，potential period (Marchto April);active period (June，August and september; pausing period (July); rising and declining period (October to November) and ditto period (December，January and February)．
The distributive pattern of this animal in the fields was aggregative as individual group, but the relationship between the aggregation and population number was negative, when the population number was higher，the aggregative force was lower．The results indicated that no pregnant individuals of female had been found in December，January
and February，and the reproduction paused in these months．