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. 2020 Apr 30;11(5):275.
doi: 10.3390/insects11050275.

Using a Two-Sex Life Table Tool to Calculate the Fitness of Orius strigicollis as a Predator of Pectinophora gossypiella

Shahzaib Ali  1 , Sizhe Li  1 , Waqar Jaleel  2   3   4   5 , Muhammad Musa Khan  6 , Jintao Wang  7 , Xingmiao Zhou  1
Affiliations

Using a Two-Sex Life Table Tool to Calculate the Fitness of Orius strigicollis as a Predator of Pectinophora gossypiella

Shahzaib Ali et al. Insects. .

Abstract

A two-sex life table is a useful tool for studying the fitness of predators. Previous studies of Orius strigicollis Poppius (Heteroptera: Anthocoridae) fitness have not been done on Pectinophora gossypiella (Lepidoptera: Gelechiidae) using a two-sex life table tool. This study reports the fitness of the minute predatory flower bug, O. strigicollis when feeding on the cotton pest P. gossypiella using a two-sex life table tool. Different densities (5, 10, and 15 eggs) of P. gossypiella eggs were used to calculate the feeding capacity and fitness of O. strigicollis in the laboratory at 28 °C ± 1, 75 ± 5% RH and 16:8 (L:D). The results concluded that O. strigicollis is an efficient predator of P. gossypiella. The maximum growth capacity of the predatory bug O. strigicollis was attained when it was fed on 10 and 15 P. gossypiella eggs. Furthermore, shorter generation and development time were also observed in the case of 15 eggs of P. gossypiella. These results suggest that O. strigicollis has considerable predatory potential and prefers feeding on P. gossypiella eggs than on the first instar larvae at the fourth instar or the female stage. Although the field potential of O. strigicollis is still unknown, this study will support future investigations in terms of field applications.

Keywords: Orius strigicollis Poppius; Pectinophora gossypiella; age-stage; feeding potential; population parameters; selection pressure; two-sex life table.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Figures

Figure 1
Figure 1
Feeding potential of the predatory stages of the O. strigicollis on three different densities of P. gossypiella eggs (5, 10 and 15) after 24 h, (A) = 3rd instar, (B) = 4th Instar, (C) = 5th Instar, (D) = Male, (E) = Female. Different letters above each bar indicate significant differences between three treatments using one-way ANOVA, LSD test, p = 0.05 and n = 30).
Figure 2
Figure 2
Feeding potential of the predatory stages of the O. strigicollis on three different densities of P. gossypiella first instar larvae (5, 10, and 15) after 12 h, (A) = 3rd instar, (B) = 4th Instar, (C) = 5th Instar, (D) = Male, (E) = Female, (F) = Control. Different letters above each bar indicate significant differences between three treatments using one-way ANOVA, LSD test, p = 0.05 and n = 30).
Figure 3
Figure 3
Feeding potential of the predatory stages of the O. strigicollis on three different densities of P. gossypiella first instar larvae (5, 10, and 15) after 24 h, (A) = 3rd instar, (B) = 4th Instar, (C) = 5th Instar, (D) = Male, (E) = Female, (F) = Control. Different letters above each bar indicate significant differences between three treatments using one-way ANOVA, LSD test, p = 0.05 and n = 30).
Figure 4
Figure 4
Influence of three different densities of P. gossypiella eggs ((A) = 5 eggs, (B) = 10 eggs and (C) = 15 eggs) on the age-stage-specific survival rate (sxj) of the O. strigicollis; N1 = 1st Instar, N2 = 2nd Instar, N3 = 3rd Instar, N4 = 4th Instar, N5 = 5th Instar.
Figure 5
Figure 5
Influence of three different densities of P. gossypiella eggs ((A) = 5 eggs, (B) = 10 eggs and (C) = 15 eggs) on the age-specific survival rate (lx), female age-specific fecundity (fx), age-specific fecundity (mx), and age-specific maternity (lxmx) of the O. strigicollis.
Figure 6
Figure 6
Influence of three different densities of P. gossypiella eggs ((A) = 5 eggs, (B) = 10 eggs and (C) = 15 eggs) on the age-stage-specific life expectancy (exj) of the O. strigicollis; N1 = 1st Instar, N2 = 2nd Instar, N3 = 3rd Instar, N4 = 4th Instar, N5 = 5th Instar.
Figure 7
Figure 7
Influence of three different densities of P. gossypiella eggs ((A) = 5 eggs, (B) = 10 eggs and (C) = 15 eggs) on the age-stage reproductive value (vxj) of the O. strigicollis; N1 = 1st Instar, N2 = 2nd Instar, N3 = 3rd Instar, N4 = 4th Instar, N5 = 5th Instar.
Figure 8
Figure 8
Prey preference between P. gossypiella eggs and first instar larvae (10 each) of the predatory stages of O. strigicollis during 8 h, 16 h and 24 h treatment using paired t-test, n = 10, * p < 0.05, ** p < 0.01, ((A) = 3rd instar, (B) = 4th Instar, (C) = 5th Instar, (D) = Male, (E) = Female).
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