Establishment and Analysis of Life Table and Matrix Model for Experimental Population of Delia antiqua

The onion maggot Delia antique is an ideal model species for the sutdy of the molecular mechanism of insect diapause. This study investigated the life cycle of the onion maggat, D. antiqua, with life table of experimental population to understand population growth, population dynamics and population forecast. The experimental population of the onion maggot has been reared under constant laboratory conditions with the artificial diet. And the life table has been established with standard ecological method. The results showed that the population trend index(Ⅰ)reached 9.81, overall survival for generations reached to 12%, and the experimental population survivorship curve was obviously type Ⅱ survivorship curve which indicated that the suvival rates of eggs, larvas, pupas and adults were stable. The component analysis formula was used to analyze the contribution of every stage to the index of population trend. The result indicated the pupa stage was the main effect stage, and the preoviposition adult stage had a minimal effect. The insect population matrix model of the D. antiqua had been established with the method of nonequal development time. With the matrix model, age distribution of every stage and the population variation with the sequence of time could be predicted.