Abstract
Lady beetles are the most important predatory species among arthropods; thus, studying their population parameters gives a clear picture about their life span. The demography of the lady beetle, Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae), was studied under laboratory condition, on Aphis fabae at 27 °C based on the age-stage, two-sex life table. The means and standard errors were estimated by the bootstrap techniques. The results showed that the intrinsic rate of increase (r) and the finite rate of increase (λ) were 0.18 and 1.20 d−1, respectively. The net reproduction rate (R 0) and the gross reproduction rate were 232.49 and 442.48 offspring/individual, respectively. The mean generation time (T) was 29.03 days. The first peak of reproductive value in females was on the 18th day, which coincides with the total pre-oviposition period counted from birth. The life expectancy curve (exj ) of a new hatched female adult was 60 days. The results demonstrated that growth, survival and development of the predator can be described accurately by use of the age-stage, two-sex life table.
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