Effects of crowding, isolation, and transfer from isolation to crowding on total ecdysteroid content of eggs in Schistocerca gregaria

Journal of Insect Physiology
Bernd F HägeleS Simpson

Abstract

We examined the ecdysteroid content of eggs from crowd-reared and solitary-reared desert locusts, Schistocerca gregaria, throughout embryogenesis from the day of egg laying until shortly before hatching on day 14. Depending on the time during incubation, ecdysteroid content in eggs from crowd-reared females was 5-10 times higher than in eggs from solitary-reared females. Our investigation revealed two peaks in ecdysteroid content of eggs from crowd-reared females, a small one at day 3 and a major peak at day 10 of incubation. At days 10, 12 and 14 during incubation of eggs from crowd-reared females, we found a positive correlation between egg mass and ecdysteroid content. There was no difference between eggs from the bottom and the top of individual egg pods, but variation in ecdysteroid content between egg pods from different females was considerable in all treatment groups. A brief crowding of solitary-reared females at the time of egg laying, a treatment that initiates maternally mediated gregarization of the developing offspring, had no effect on the consistently low ecdysteroid content in the eggs. This result rules out the possibility that the crowding experience of females is transmitted to the offspring by variation in ...Continue Reading

References

Oct 1, 1978·Hoppe-Seyler's Zeitschrift für physiologische Chemie·F GoltzenéJ A Hoffmann
Jul 9, 1999·Archives of Insect Biochemistry and Physiology·A I TawfikF Sehnal
May 29, 2003·Journal of Insect Physiology·M P. Pener, Yoram Yerushalmi

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Citations

Feb 2, 2008·Science in China. Series C, Life Sciences·FangHai WangGuoFeng He
Apr 25, 2015·Developmental Biology·Seth Donoughe, Cassandra G Extavour
May 27, 2016·PloS One·Benjamin PélissiéMarie-Pierre Chapuis

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