FLUCTUATION IN WILD POPULATION SIZE OF ANOUROSOREX SQUAMIPES AND ITS PREDICATION

Based on the data in successive years from 1976 to 2004, analysis of the fluctuation in population density of the dominant species (Anourosorex squamipes) of small-sized rodents in Nanchong, Sichuan was made. Under indoor conditions, no cyclic variation was observed. Under out-door conditions, annual cyclic variation was present, expressed as two peaks in a year, one occurring in June and the other in November and December. The relative population density of the young animal group (I) was the greatest in winter and the smallest in spring, while for the second adult group (III), The highest population density occurred in summer and the lowest in winter. Three regression equations were established based on the adult/sub-adult ratio of the population, male animals and female animals: Y = 0.167 X - 4.065, Y = 0.148 X -2.754, and Y = 0.142 X - 1.830. Application of these regression equations prediction of the population of this animal species can be made 2 months in advance.