Linking Demography and Consumption of Henosepilachna vigintioctopunctata (Coleoptera: Coccinellidae) Fed on Solanum photeinocarpum (Solanales: Solanaceae): With a New Method to Project the Uncertainty of Population Growth and Consumption

Abstract

Because life tables are capable of providing the most comprehensive description on the survival, stage differentiation, and the reproduction of animal populations, they can be considered as the bases of population ecology and pest management. Researchers concerned with studies involving life tables inevitably face the problem of describing the variabilities that occur in the survival, stage differentiation, and fecundity data. Finding a means to include these variabilities in population projections concerning pest management may be problematic. Henosepilachna vigintioctopunctata (F.) (Coleoptera: Coccinellidae) is a pest of many plant species in Asia, including cultivated crops, ornamentals, and wild plants. The raw life history data (survival, stage differentiation, and fecundity) and consumption rate of both sexes of H. vigintioctopunctata reared on Solanum photeinocarpum Nakamura et Odashima (Solanales: Solanaceae) were collected in the laboratory and analyzed based on the age-stage, two-sex life table theory. The intrinsic rate of increase (r), finite rate of increase (λ), net reproductive rate (R0), mean generation time (T), and net consumption rate (C0) of H. vigintioctopunctata were 0.1312 d-1, 1.1402 d-1, 603.5 offspring, 48.8 d, and 77.8 cm2, respectively. By using the bootstrap technique with 100,000 samples, we demonstrated that the life tables constructed based on the 2.5th and 97.5th percentiles of R0 and λ can be used to describe the variabilities found in the survival and fecundity curves and to project the uncertainty of population growth.

Effects of simulated climate warming on the population dynamics of Sitobion avenae (Fabricius) and its parasitoids in wheat fields

“…The consequences of elevated temperatures on herbivores can be due to direct mechanisms, but may also be influenced indirectly by interactions between trophic levels . This is because climate change may disrupt trophic interactions via direct effects on species or phenological shifts between interacting species.…”

“…L x . M x / R 0 , r m = ln R 0 /T, λ = e r m , t d = ln2/ r m ), where x is the duration of stage of aphids in days, L x is the survival rate during stage x , and M x is the fecundity of adults during stage x . A t‐ test was used to analyze the effects of warming on the above life table parameters.…”

“…, where x is the duration of stage of aphids in days, L x is the survival rate during stage x, and M x is the fecundity of adults during stage x. 22,23 A t-test was used to analyze the effects of warming on the above life table parameters. All analyses were performed using SAS 9.4 (SAS Institute Inc., Cary, NC, USA).…”

Population growth potential of Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) on tomato, potato, and eggplant

“…Using TIMING‐MSChart (Chi, ) the growth potential of T. absoluta from different hosts were obtained. Moreover, to expose the uncertainty of population growth, to project the population growth, we used the life table data of 0.025 and 0.975 percentiles of finite rate of increase (Huang et al, ).…”

Comparison of demographic fitness and biocontrol effectiveness of two parasitoids, Encarsia sophia and Eretmocerus hayati (Hymenoptera: Aphelinidae), against Bemisia tabaci (Hemiptera: Aleyrodidae)

“…24,26,27 However, because female age-specific life tables [28][29][30][31] ignore the male population and are incapable of describing stage differentiation, the application of female age-specific life tables often results in serious problems. 32,33 In contrast, the age-stage, two-sex life table 34,35 provides comprehensive and precise analysis of insect life history characteristics. In this study, we studied the demographic characteristics, parasitism rate and host-feeding rate of En.…”