Development,population dynamic and fecundity of Bemisia tabaci B-biotype under high temperatures for five successive generations

【摘要】：Many former studies show that the adaptability of Bemisia(abaci B-biotype to high temperature stress is one of the key mechanisms of its successful invasion and expansion throughout the world. Under the trend of global warming,the tolerance of B.tabaci B-biotype to high temperature stress could make it dominate in the competition with and replacement of other species.In this study,egg hatching rate,population dynamic,bacteriome-absent rate,survival rate of bacteriome-absent individuals,adult sex ratio,and fecundity of B.tabaci B-biotype were observed for five successive generations at 27,31,35,37℃.The results showed that the factors of temperature and generation have significant impacts on the above indices.Population dynamics and sex ratios differed significantly among temperatures and generations.The fitness of B.tabaci populations decreased with the increasing temperatures and generations.Egg hatching rate dropped from 98.9%at 27℃(control) to 52.3%at 35℃for the fifth generation.The survival rate decreased significantly and the development from egg to newly eclosed adult were significantly slowed down at 35℃for the fourth and fifth generation than those at 27℃.Bacteriome-absent offspring were observed in the fourth and fifth generations at 31℃, and from the first generation and on at 35℃with a rate increasing from 0.3%to 6.8%.The survival rates of the bacteriome-absent offspring at different treatments did not differ significantly.For the female adult,its pre-oviposition period and longeivity were shortened,and the fecundity was lower with the increasing temperatures.