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Effects of high temperature stress on adults and eggs of Drosophila robusta and D. tripunctata

The effects of high temperature stress on adult viability, fertility and egg mortality were studied in 13 strains each of Drosophila robusta and D. tripunctata. Sexes were studied separately. Adult viability of D. robusta was significantly greater than that of D. tripunctata at 27 and 30 C, temperat...

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Bibliographic Details
Published in:The American midland naturalist 1991-07, Vol.126 (1), p.118-124
Main Author: Seager, R.D. (University of Northern Iowa, Ceder Falls)
Format: Article
Language:English
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Summary:The effects of high temperature stress on adult viability, fertility and egg mortality were studied in 13 strains each of Drosophila robusta and D. tripunctata. Sexes were studied separately. Adult viability of D. robusta was significantly greater than that of D. tripunctata at 27 and 30 C, temperatures approximating their maximum ambient temperatures in nature. At 20 C there were no significant differences between species in adult viability. Viability differences between strains and sexes were generally not significant at any temperature. Fertility decreased with increased treatment temperature. There were no significant differences in fertility between the species or sexes at any temperature except for 27 C, at which female fertility was significantly lower than male fertility for both species. Egg mortality of D. tripunctata was significantly higher at 27 compared to 20 C, while there was no significant difference in the egg mortality of D. robusta between those two temperatures. These results are consistent with the hypothesis that temperature primarily regulates the seasonal abundances of D. robusta and D. tripunctata in nature.
ISSN:0003-0031
1938-4238
DOI:10.2307/2426156