Age-stage, two-sex life tables of Aphidius gifuensis (Ashmead) (Hymenoptera: Braconidae) and its host Myzus persicae (Sulzer) (Homoptera: Aphididae) with mathematical proof of the relationship between female fecundity and the net reproductive rate
Age-stage, two-sex life tables of Aphidius gifuensis (Ashmead) (Hymenoptera: Braconidae) and its host Myzus persicae (Sulzer) (Homoptera: Aphididae) with mathematical proof of the relationship between female fecundity and the net reproductive rate
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DOI：
10.1603/0046-225x-35.1.10
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发表时间：
2006-02-01
影响因子：
1.7
通讯作者：
Su, HY
中科院分区：
文献类型：
--
作者：
Chi, H;Su, HY
在实验室收集了烟粉虱Aphidius gifusis(Ashmead)和桃蚜Myzus persicae(Sulzer)的生活史资料。为了同时考虑性别和个体间不同的发育速度，使用年龄阶段的两性生命表对原始数据进行了分析。姬松茸的内禀增长率为0.264 d(-1)。平均每头雌蜂寄生率为92.3头。桃小实蝇的内禀增长率为0.252 d(-1)。对于雌性种群，我们证明了平均雌性繁殖力(F)与净繁殖率(R-o)之间的关系为R-o=S(A)F，其中S(A)为成虫前期存活率。雌虫年龄别生命表用于两性种群时，F与R-o的关系为R-o=S(A)wf，其中S(A)是雌虫的成虫前期存活率，w是雌虫在后代中的比例。当w是所有年龄的特定年龄繁殖力(m(X))的常量时，这是有效的。由于对成年前个体进行性别鉴定是困难的，而且在后代中获得恒定的性别比例也是不确定的，因此确定个体性别的成年前死亡率可能是有问题的。因此，特定年龄的存活率(L(X))以及繁殖力和种群参数的计算可能会受到不利影响。此外，如果按成人年龄构造L(X)和m(X)，也可能造成总体参数的误差。由于雌虫年龄生命表应用于阶段性结构的双性种群会导致不准确，我们建议在昆虫人口统计研究中使用年龄阶段的双性生命表。
Life history data for Aphidius gifuensis (Ashmead) and Myzus persicae (Sulzer) were collected in the laboratory. To consider both sexes and variable developmental rates among individuals, the raw data were analyzed using the age-stage, two-sex life table. The intrinsic rate of increase (r) for A. gifuensis is 0.264 d(-1). The mean parasitism rate is 92.3 aphids per female. The intrinsic rate of increase for M. persicae is 0.252 d(-1). For applying the female age-specific life table to a female population, we prove that the relationship between the mean female fecundity (F) and the net reproductive rate (R-o) is R-o = s(a)F, where s(a) is the preadult survival rate. When the female age-specific life table is applied to two-sex populations, the relationship between F and R-o is R-o = s(a)wF, where s(a) is the preadult survival rate of females, and w is the female proportion in offspring. This is valid when w is a constant for the age-specific fecundity (m(x)) of all ages. Because sexing preadult individuals is difficult, and obtaining a constant sex ratio in offspring is uncertain, determining preadult mortality of the individual sexes may be problematical. As a result, calculations of the age-specific survival rate (l(x)) and fecundity and population parameters may be adversely affected. Moreover, if l(x) and m(x) are constructed based on adult age, they may also cause errors in population parameters. Because the application of female age-specific life table to stage-structured bisexual population results in inaccuracies, we recommend that the age-stage, two-sex life table should be used in insect demographic studies.