变温下铃木氏果蝇年龄-阶段两性生命表研究

Age-stage two-sex life table of Drosophila suzukii (Diptera:Drosophilidae) at fluctuating temperatures

为进一步阐明温度对铃木氏果蝇生长发育和繁殖的影响,补充铃木氏果蝇基础生物学信息,本研究在室内14~20℃、26~32℃变温条件下人工饲养铃木氏果蝇,对比不同变温条件下铃木氏果蝇的发育历期、存活率和繁殖率,并构建年龄-阶段两性生命表。结果表明:与26~32℃处理相比,14~20℃变温处理下铃木氏果蝇的各阶段发育历期、成虫寿命及产卵前期均较长。14~20℃变温处理下该虫年龄-阶段特征存活率(sxj)、年龄-特征存活率(lx)、年龄-阶段特征生殖能力(vxy)以及期望寿命(exy)均高于26~32℃处理,而繁殖力(fxj、mx)低于26~32℃处理。14~20℃变温处理下该虫的内禀增长率(rm)和周限增长率(λ)低于26~32℃处理,而平均世代周期(T)和种群加倍时间(t)高于26~32℃处理。在变温条件下,高温相较于低温更利于铃木氏果蝇的种群增长。

Aimed to explore the effects of fluctuating temperature on the growth and reproduction of Drosophila suzukiiand supplement its basic biological data,this study was carried out to establish a two-sex life table for D.suzukii under fluctuating temperatures.D.suzukii was reared at the fluctuating temperatures 14-20℃and26-32℃,respectively,in the laboratory for recording the developmental duration,survival rate and reproduction rate of D.suzukii.The age-stage two-sex life table was established with the parameters.The results showed that the developmental duration,preoviposition period and adult longevity of D.suzukii at the fluctuating temperature 14-20℃ were higher than at 26-32℃.Age-stage specific survival rate（sxj）,age-specific survival rate（lx）,age-stage specific life expectancies（exy）and age-stage specific reproductive value（vxy）at 14-20℃ were higher than at 26-32℃,but the fecundity（fxj,mx）at 14-20℃ was lower than at 26-32℃.The intrinsic rate（rm）and finite rate（λ）of D.suzukii at 14-20℃ were lower than at 26-32℃,while the mean generation time（T）and population-doubling time（t）were higher than at 26-32℃.Therefore,high temperature is more suitable for the survival and growth of D.suzukii at fluctuating temperatures.