Effects of temperature on reproductive capacity and longevity of Trissolcus simoni, an egg parasitoid of Eurygaster integriceps

Abstract

In order to understand the effects of temperature on Trissolcus simoni, some parameters of the life tables of adult parasitoids were investigated under laboratory conditions. The following parameters were measured (the values in parentheses were obtained at 20, 26, and 32°C temperatures, respectively): net reproductive rate (R o =37.785, 40.301, and 58.299), intrinsic rate of population increase (r m =0.111, 0.221, and 0.325), generation time (T=32.77, 16.60, and 12.49 days), doubling time (DT=6.245, 3.136, and 2.133), and finite rate of increase (k=1.117, 1.247, and 1.385). Fecundity increased with increasing temperature. The values for total number of eggs deposited per female were 50.1, 64.1, and 68.1, and average female longevity was 24.2, 13.8, and 11.1 days at 20, 26, and 32°C, respectively. Temperature had a significant effect on longevity and oviposition and post-oviposition periods. The results of the study are discussed and compared with life-table parameters of other scelionids.

Age‐specific fecundity and life table of Trissolcus semistriatus, an egg parasitoid of the sunn pest Eurygaster integriceps

“…Trissolcus semistriatus had lower values of R 0 than other scelionids. Trissolcus urichi Crawford, 1913, had an R 0 of 116.4 on eggs of Edessa meditabunda (Fabricius, 1812) (La Porta 2000a) and 113.1 on eggs of Dichelops furcatus (Fabricius, 1775) (Hemiptera: Pentatomidae) (La Porta 2000b), although the R 0 values of T. simoni (and all the other parameters) were similar to the values found for T. semistriatus in the present study, being 37.8, 40.3 and 58.3 at 20°C, 26°C and 32°C, respectively (Kivan & Kilic 2005). Similar results for r m , λ, G and DT to those found in the present study were found at 26°C for T. urichi with eggs of E. meditabunda (La Porta 2000a,b).…”

“…The present results are similar to those of Awadalla (1996) for T. megallocephalus , James and Warren (1991) for T. oenone , Chabi‐Olaye et al . (1997) for Telenomus busseolae Gahan, 1922, and Kivan and Kilic (2005) for Trissolcus simoni Mayr, 1879, all of which reported a negative correlation between adult longevity and temperature.…”

Effects of Cold Storage on Field and Laboratory Performance of Trichogramma carverae (Hymenoptera: Trichogrammatidae) and the Response of Three Trichogramma spp. (T. carverae, T. nr. brassicae, and T. funiculatum) to Cold

“…Increased longevity of C. noackae at low temperature agrees with data for egg parasitoids such as Trissolcus simoni (Mayr) (Hymenoptera: Scelionidae) between 20 and 32 °C (Kivan & Kilic 2005) and Trichogramma pratissolii Querino & Zucchi (Hymenoptera: Trichogrammatidae) from 15 to 33 °C (Zago et al 2007). Increased longevity may be associated with reduced activity and metabolism at lower temperatures (Gerling 1972;Bleicher & Parra 1990).…”

Demographic attributes of the parthenium beetle Zygogramma bicolorata (Coleoptera: Chrysomelidae) under different variables

“…Demographic analysis is a well-recognized standard ecological method helpful in generating informative statistics about survival, developmental rate and reproductive success of an organism (Kivan and Kilic, 2005). This analysis conveys information on the parental investment and adult self-maintenance of the population along with understanding of the age dynamics of adult populations (Carey, 2001).…”