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Alternating temperatures affect the performance of Trichogramma species.

Firake DM, Khan MA - J. Insect Sci. (2014)

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.

View Article: PubMed Central - PubMed

Affiliation: Division of Entomology, ICAR Research Complex for NEH Region, Umiam, Meghalaya-793103, India dfirake@gmail.com.

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Mean (±SEM) values of % females in the progeny of Trichogramma poliae (a) and T. chilonis (b) under the influence of various temperature shocks during immature stages. Bars having same arena with different letters indicate statistically significant differences (P ≤ 0.05, Tukey's HSD test). High quality figures are available online.
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f07_01: Mean (±SEM) values of % females in the progeny of Trichogramma poliae (a) and T. chilonis (b) under the influence of various temperature shocks during immature stages. Bars having same arena with different letters indicate statistically significant differences (P ≤ 0.05, Tukey's HSD test). High quality figures are available online.

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.


Alternating temperatures affect the performance of Trichogramma species.

Firake DM, Khan MA - J. Insect Sci. (2014)

Mean (±SEM) values of % females in the progeny of Trichogramma poliae (a) and T. chilonis (b) under the influence of various temperature shocks during immature stages. Bars having same arena with different letters indicate statistically significant differences (P ≤ 0.05, Tukey's HSD test). High quality figures are available online.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4206293&req=5

f07_01: Mean (±SEM) values of % females in the progeny of Trichogramma poliae (a) and T. chilonis (b) under the influence of various temperature shocks during immature stages. Bars having same arena with different letters indicate statistically significant differences (P ≤ 0.05, Tukey's HSD test). High quality figures are available online.
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.

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.

View Article: PubMed Central - PubMed

Affiliation: Division of Entomology, ICAR Research Complex for NEH Region, Umiam, Meghalaya-793103, India dfirake@gmail.com.

Show MeSH
Related in: MedlinePlus