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  • 1
    ISSN: 1573-3297
    Keywords: Mating behavior ; reproductive isolation ; sexual isolation ; semispecies ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Preadult seclusion imposed upon members of theDrosophila paulistorum complex of intersterile semispecies significantly decreased sexual isolation between adults of the semispecies. While seclusion at any developmental stage had this effect, there were quantitative variations correlated with the stage at which seclusion had been initiated: the earlier the stage at which seclusion began, the more frequent were the heterogamic matings. All the stages of development seemed to contribute to final adult sexual behavior, with no single stage emerging as the most important experiential phase. Seclusion also significantly affected intrasemispecific matings, in that flies were more likely to mate with partners having similar experiences.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-3297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-3297
    Keywords: mating behavior ; reproductive isolation ; sexual isolation ; sexual selection ; semispecies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract We present results deriving from the inception of an investigation (involving 4,000 scored matings) into the development of discriminatory behavior inDrosophila paulistorum. We examined two complementary situations for their effects on mating behavior: physical isolation (seclusion) beginning at each of six developmental stages and exposure to heterosemispecifics during all preadult stages (mixed culturing). Preadult seclusion at certain stages decreased sexual isolation between three of four semispecific pairs. Seclusion effect, or lack thereof, varied with semispecies and with the stage at which seclusion was imposed: the earlier the stage at which seclusion was initiated, the more drastic the effect. In contrast, mixed culturing increased sexual isolation between the one pair of semispecies that was tested.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-3297
    Keywords: Mating behavior ; reproductive isolation ; sexual isolation ; semispecies ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract We have been utilizing membres of theDrosophila paulistorum complex of semispecies to study the development of adult discriminatory behavior. In this study, three rearing methods were used to examine the effects of previous exposure to heterosemispecifics on reproductive isolation among the various semispecies. Experimental flies were exposed to heterosemispecifics by one of three methods: exposure to airborne heterosemispecific stimuli from egg through sexual maturity, physical contact with heterosemispecifics only during the postimaginal period, and mixed culturing (total physical contact with heterosemispecific individuals during each of five preimaginal stages). Effects of the first treatment varied with semispecies. The second treatment had no significant effect on mating behavior. The third treatment of mixed culturing reinforced sexual isolation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Behavior genetics 29 (1999), S. 65-73 
    ISSN: 1573-3297
    Keywords: Mating behavior ; reproductive isolation ; sexual isolation ; sibling species ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract In an investigation into the effects of developmental isolation from all conspecifics, the Drosophila willistoni group of six sibling species responded to differing degrees: all six are reproductively isolated from D. paulistorum, the tester species. Drosophila pavlovskiana, a narrow endemic, proved the most vulnerable, responding by reducing its adult sexual isolation, if eggs, any instar, and sometimes even pupae were socially isolated. To lesser degrees, D. tropicalis and D. willistoni both produced similar results only when their eggs were isolated, i.e., when from the moment of egg deposition on, there was absolutely no contact with other flies until testing for mating behavior. The remaining siblings, D. equinoxialis and D. insularis, were immovable.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Behavior genetics 28 (1998), S. 57-65 
    ISSN: 1573-3297
    Keywords: Courtship ; sexual selection ; sexual isolation ; semispecies ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Early social experiences play important roles in adult Drosophila paulistorummate selection. Differences in courtship between control males and wholly socially isolated males were observed in chambers. Socially isolated males displayed more courtship toward virgin females than did controls. Socially isolated males were more successful in competing for mates. Yet socially isolated males from all six semispecies also displayed notable frequencies of homosexual behavior.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 133 (1987), S. 553-559 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Treatment of hamster fibroblasts with the sulfhydryl-reducing agent β-mercaptoethanol (β-ME) results in increased synthesis of the glucose-regulated proteins (GRPs). The most abundant protein species being induced in the GRP78, with a minor increase also observed for GRP94. The enhanced synthesis of the GRP94 and GRP78 is primarily due to an increase in the steady state levels of the two GRP transcripts. Although β-ME has a general inhibitive affect on amino acid uptake and protein synthesis, compared to other protein synthesis inhibitors such as cycloheximide, puromycin, and amino acid analogue canavanine, β-ME is a more potent inducer of GRP gene expression. In addition, the induction by low dosage of β-ME requires de novo protein synthesis and is preceded by a drop in the rate of protein glycosylation. Our results support the hypothesis that denatured proteins can induce the GRP genes; however, a blockage ofsome post-translocational processing step in the endoplasmic reticulum, as a result of β-ME or other stress treatments, may provide the additional stimulation which transcriptionally activates the GRP genes to high levels.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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