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dc.contributor.authorChi, H.en_US
dc.contributor.author齊 心zh_TW
dc.contributor.authorSu, H.Y.en_US
dc.description.abstractLife 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.en_US
dc.relationEnvironmental Entomologyen_US
dc.relation.ispartofseriesEnvironmental Entomology, Volume 35, Issue 1, Page(s) 10-21.en_US
dc.subjectlife tableen_US
dc.subjectAphidius gifuensis (Ashmead)en_US
dc.subjectMyzus persicae (Sulzer)en_US
dc.subjectbemisia-argentifolii homopteraen_US
dc.subjectgreen peach aphiden_US
dc.subjectintrinsic rateen_US
dc.titleAge-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 rateen_US
dc.typeJournal Articlezh_TW
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