关键词: 短额负蝗, 地理种群, 发育历期, 发育起点温度, 有效积温

Abstract: 【Aim】 This study aims to ascertain the adaptability of different geographical populations of Atractomorpha sinensis in response to environmental temperature. 【Methods】By using soybean leaves as the food source, we observed the growth and development process of various developmental stages of five geographical populations of A. sinensis from Yan′an, Shaanxi (YA), Zhengzhou, Henan (ZZ), Chengdu, Sichuan (CD), Qujing, Yunnan (QJ) and Guangzhou, Guangdong (GZ) under the conditions of different constant temperatures (16, 20, 24, 28 and 32℃), RH 70% and a photoperiod of 16L∶8D, evaluated the variations in the developmental duration, developmental rates, developmental threshold temperatures and effective accumulated temperatures of different geographical populations, and analyzed the acorrelation between population biological indices and habitat environmental temperature. 【Results】 The developmental rate of different geographical populations of A. sinensis increased with the increase in temperature. However, the CD and GZ populations could not complete their generation at 16℃. As the habitat latitude and altitude increased, the developmental threshold temperatures of generation and various developmental stages of the populations gradually decreased, while their effective accumulated temperatures exhibited an increasing trend. The developmental threshold temperatures of the GZ, QJ, CD, ZZ and YA populations were 15.61, 10.76, 14.93, 11.46 and 10.51℃, respectively. The developmental threshold temperatures of generation of the GZ and CD populations were significantly higher than those of the other populations. The effective accumulated temperature of the GZ, QJ, CD, ZZ and YA populations were 828.41, 1 482.94, 963.13, 1 295.80, and 1 430.98 degree-days, respectively. The effective accumulated temperatures of the QJ and YA populations were significantly higher than those of the other populations. The temperature 24℃ is the optimal environmental temperature for the five geographical populations. The effective accumulated temperature of each developmental stage of different geographical populations is significantly negatively correlated with the annual average temperature of their habitats, while the developmental threshold temperature is significantly positively correlated with the annual average temperature of their habitats. 【Conclusion】 The results suggest that there exist differences in the adaptability of different geographical populations of A. sinensis to environmental temperature, and their adaptability to low environmental temperature increases with the increase in habitat latitude and altitude, while that to high environmental temperature show the opposite trend.

Key words: Atractomorpha sinensis, geographical population, developmental duration, developmental threshold temperature, effective accumulated temperature