Alternating temperatures affect the performance of Trichogramma species.
Bottom Line: Fecundity and longevity of parasitoids were significantly reduced under high temperature shocks to egg-laying females.However, the effect was more severe in eggs.Overall, daily short-term temperature shocks to different developmental stages of parasitoids showed radical effects on emergence, fecundity, longevity, and sex ratio of the progeny.
Affiliation: Division of Entomology, ICAR Research Complex for NEH Region, Umiam, Meghalaya-793103, India email@example.com.Show MeSH
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Mentions: Sex ratio of the progeny (G1 and F1). No significant differences were noticed in sex ratio of the progeny (G1) of T. poliae (F = 0.50, P = 0.77, df = 5) or T. chilonis (F = 0.73, P = 0.60, df = 5); when their mothers (G0) were exposed to various temperature shocks (Figure 7). However, the sex ratio of the progeny of T. poliae and T. chilonis (G1) decreased considerably (F = 9.93, P < 0.01, df = 2, and F = 11.38, p < 0.01, df = 2, respectively) under high temperature shocks at the egg stage, favoring females (Figure 7). Furthermore, the sex ratio of T. poliae (F1) was significantly affected (F = 13.37, P < 0.01, df = 5) as a result of various temperature shocks to egglaying females (F0) (Figure 8). A parallel trend was observed in T. chilonis (F1) (F = 10.24, P < 0.01, df = 5) (Figure 8). Interestingly, sex ratio of both the parasitoid species was female-biased under all temperature shock levels.
Affiliation: Division of Entomology, ICAR Research Complex for NEH Region, Umiam, Meghalaya-793103, India firstname.lastname@example.org.