桔小实蝇抗高效氯氰菊酯品系种群生命参数与相对适合度

Population life parameters and relative fitness of alpharmethrin-resistant Bactrocera dorsalis strain

系统观察了桔小实蝇抗高效氯氰菊酯品系和敏感品系试验种群在(28±2)℃下的生长发育和生殖情况,组建了两品系的实验种群生命表,分析了抗性种群与敏感种群的生态适合度差异.结果表明:抗高效氯氰菊酯品系(AlR90)不同虫态的发育历期、平均世代历期、产卵前期均显著延长.与敏感品系相比,产卵高峰期抗性品系日产卵量不稳定,单雌产卵量、卵孵化率、成虫羽化率均显著下降,敏感品系平均每雌产卵量为324.0粒、抗性品系仅为240.7粒.对实验种群生命表进行研究表明:抗高效氯氰菊酯品系的种群趋势指数(I=79.10)显著低于敏感品系(I=116.97);净生殖率R0和内禀增长率rm分别为1414.00和7.9463,均显著低于敏感品系(R0=2184.00、rm=8.3809).抗性品系的相对适合度仅为0.6474,研究结果表明桔小实蝇抗高效氯氰菊酯品系在繁殖和生长发育上存在明显的生存劣势.

Based on the observation of the development and reproduction of experimental populations of alpharmethrin-resistant and susceptible Bactrocera dorsalis strains at （ 28 ± 2 ） ℃ , the life tables of the populations were established, and the differences in the relative ecological fitness of the two strains was analyzed. The results showed that comparing with alpharmethrin-susceptible B. dorsalis strain, the resistant one had longer durations of development stages, average generation, and previposition, its fecundity was not stable and lower, and the hatch of eggs and the emergence of adults were depressed. The fecundity of the susceptible and resistant strains was 324.0 and 240. 7, respectively. Based on the life tables, the population trend index （I） of resistant strain was 79. 10, while that of susceptible strain was 116.97. The net reproduction rate （R0 ） and the intrinsic rate of increase （ rm ） of resistant strain were 1414.00 and 7.9463, while those of susceptible strain were 2184. O0 and 8. 3809, respectively. The relation fitness of resistant strain was only 0. 6474. All of the results revealed that the resistant strain was at an obvious inferior position of reproduction and development.