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  • 11
    Digitale Medien
    Digitale Medien
    Conditions for sympatric speciation: A diploid model incorporating habitat fidelity and non-habitat assortative mating (1996)
    Springer
    Evolutionary ecology 10 (1996), S. 187-205 
    Details
    ISSN: 1573-8477
    Schlagwort(e): speciation ; habitat-sympatric divergence ; divergent selection ; habitat preference ; assortative mating ; linkage disequilibrium ; penetrance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Three types of genes have been proposed to promote sympatric speciation: habitat preference genes, assortative mating genes and habitat-based fitness genes. Previous computer models have analysed these genes separately or in pairs. In this paper we describe a multilocus model in which genes of all three types are considered simultaneously. Our computer simulations show that speciation occurs in complete sympatry under a broad range of conditions. The process includes an initial diversification phase during which a slight amount of divergence occurs, a quasi-equilibrium phase of stasis during which little or no detectable divergence occurs and a completion phase during which divergence is dramatic and gene flow between diverging habitat morphs is rapidly eliminated. Habitat preference genes and habitat-specific fitness genes become associated when assortative mating occurs due to habitat preference, but interbreeding between individuals adapted to different habitats occurs unless habitat preference is almost error free. However, ‘nonhabitat assortative mating’, when coupled with habitat preference can eliminate this interbreeding. Even when several loci contribute to the probability of expression of non-habitat assortative mating and the contributions of individual loci are small, gene flow between diverging portions of the population can terminate within less than 1000 generations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01241784
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  • 12
    Digitale Medien
    Digitale Medien
    Biochemical and immunological studies on an α-glycerophosphate dehydrogenase from the tephritid fly, Anastrepha suspensa (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 4 (1987), S. 271-286 
    Details
    ISSN: 0739-4462
    Schlagwort(e): tephritid ; immunological studies ; biochemical studies ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: A rapid and efficient procedure has been developed for the purification of α-glycerophosphate dehydrogenase from the tephritid fly Anastrepha suspensa. This procedure is applicable to the isolation of the enzyme from other tephritids. The A. suspensa α-glycerophosphate dehydrogenase is dimeric with a molecular weight of 70,000 and a subunit molecular weight of 35,000. The pH optimum of the enzyme is 7.0. The amino acid composition is compared with that of other α-glycerophosphate dehydrogenases. By means of the quantitative microcomplement fixation procedure the A. suspensa α-glycerophosphate dehydrogenase is compared immunologically to a variety of other tephritid and dipteran α-glycerophosphate dehydrogenases.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/arch.940040405
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