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

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    SYSNO ASEP0100932
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JOstatní články
    TitleEffects of crowding, isolation, and transfer from isolation to crowding on total ecdysteroid content of eggs in Schistocerca gregaria
    TitleÚčinek populační hustoty a její změny na obsah ekdysteroidů va vajíčkách saranče pustinné
    Author(s) Hägele, B. F. (GB)
    Wang, Fanghai (ENTU-I)
    Sehnal, František (ENTU-I)
    Simpson, S. J . (GB)
    Source TitleJournal of Insect Physiology. - : Elsevier - ISSN 0022-1910
    Roč. 50, č. 7 (2004), s. 621-628
    Number of pages8 s.
    Languageeng - English
    CountryGB - United Kingdom
    KeywordsSchistocerca gregaria ; phase change ; Ecdysteroids
    Subject RIVED - Physiology
    R&D ProjectsGA522/98/0773 GA ČR - Czech Science Foundation (CSF)
    CEZAV0Z5007907 - ENTU-I, BC-A
    AnnotationDepending on the developmental time, ecdysteroid content in eggs from crowd-reared females is 5 - 10 times higher than in eggs from the solitary-reared females. Ecdysteroids rise to a small peak at day 3 and a major peak at day 10 of egg incubation. Positive correlation between egg mass and ecdysteroid content was detected at days 10, 12 and 14 in eggs from crowd-reared females. There is 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 is 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, has 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 the total amount of ecdysteroids in their eggs
    WorkplaceInstitute of Entomology (until 2005)
    ContactHelena Musilová, musilova@entu.cas.cz, Tel.: 387 775 216
    Year of Publishing2005

Number of the records: 1  

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