关键词: 关键词: 菜豆象;发育速率, 发育起点温度, 有效积温, 数学模型, 种群生命表

Abstract: 【Aim】 This study aims to explore the influence of temperature on the development and reproduction of the experimental populations of Acanthoscelides obtectus. 【Methods】 The duration of different developmental stages of A. obtectus were measured at different temperatures (20, 23, 26, 29 and 32℃), the relationship between temperature and developmental stage was fitted using line regression, Logistic model and “Wang-Lan-Ding” model, the developmental threshold temperature and effective accumulated temperature were calculated by using least square method, and the life tables of the experimental populations were established. 【Results】 The duration of various developmental stages of A. obtectus shortened with the rise of temperature, whereas the developmental rate was positively correlated with temperature. For the relationship between developmental rate and temperature, the Logistic model and “Wang-Lan-Ding” model fitted better than the line regression model. The developmental threshold temperature and the effective accumulated temperature for generation were 6.44℃ and 858.22 degree-days, respectively. Fecundity, hatchability and survival rate were the highest at 26℃ (52.71 eggs, 82.67% and 75.67%, respectively), and the lowest at 32℃ (33.20 eggs, 69.33% and 41.67%, respectively). The r_m values were 0.05, 0.07, 0.08, 0.09 and 0.08, and the R₀ values were 25.54, 33.80, 39.87, 34.52 and 13.86 at 20, 23, 26, 29 and 32℃, respectively. 【Conclusion】 Temperature has a significant effect on the population growth and reproduction of A. obtectus, and the optimum temperature range for its growth and development and reproduction is between 20-29℃.    

Key words: Key words: Acanthoscelides obtectus, developmental rate, developmental threshold temperature, effective accumulated temperature, mathematical model, population life table