Aenasius arizonensis (Girault, 1915)

Kahya, Doğancan, B, Asime Filiz Çalişkan Keçe & B, Mehmet Rifat Ulusoy, 2021, Determining some biological parameters of Aenasius arizonensis (Girault) (Hymenoptera: Encyrtidae) on cotton mealybug and the rate of parasitism in field conditions, Turkish Journal of Zoology 45, pp. 416-424 : 420-421

3.2. Life table parameters of Aenasius arizonensis under laboratory conditions

According to results of life table parameters of A. arizonensis , the intrinsic rate of increase (r), net reproduction rate (R 0), finite rate of increase (λ), gross reproductive rate (GRR), and mean generation time (T) were found 0.135 day –1, 41.25 offspring/female, 1.144 day –1, 60.90 offspring /female, and 27.57 days, respectively ( Table 3). Figure 4 showed that mortality started for male individuals 17 days after hatching period. The survival rate of female individuals decreased 31 days after hatching. In addition, age-specific fecundity (m x) started to increase for a female 3 days after hatching and started to decrease on the 27th day.

Net reproduction The intrinsic rate of rate (R) increase (r) (day –1) 0 (offspring/female)

Aenasius arizonensis 0.135 ± 0.010 41.25 ± 9.89

Gross reproductive

Finite rate of Mean generation rate (GRR)

increase (λ) (day –1) time (T) (day) (offspring/female)

1.144 ± 0.011 60.90 ± 8.017 27.57 ± 0.476

Vijaya and Ram (2016) studied the biology of A. arizonensis at different temperatures and recorded net reproductive rate (R 0), the intrinsic rate of increase (r m), finite rate of increase (λ), and net generation time (T) was 33.93, 0.083, 1.086, and 42.27, respectively, at 25 °C. Joodaki et al (2020) found r, R 0, λ, and T values as 0.1192 day –1, 38.04 offspring/female, 1.126 day –1, and 30.52 days, respectively at 25 °C with age-stage two-sex life table during their study. Two-sex (male and female) life table theory included both sex populations, stage differentiation and variable developmental rates in the theory put forth by Chi (1988). As can be seen in present and previous studies about life table parameters, especially r (the intrinsic rate of increase) value, which affects fertility and mortality, was found higher in two-sex life table analysis. In addition, R 0 (net reproductive rate) was found higher in two-sex life table at 25 °C.

Figures

Figure 4. Age-specific survival rate (l), age-specific fecundity (m), and age-specific maternity (lxm) of X x x Aenasius arizonensis.