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  • 1
    Electronic Resource
    Electronic Resource
    Hybridization in freshwater fishes: a review of case studies and cytonuclear methods of biological inference (2000)
    Springer
    Reviews in fish biology and fisheries 10 (2000), S. 293-323 
    Details
    ISSN: 1573-5184
    Keywords: anthropogenic ; cytonuclear ; disequilibrium ; fish ; Gambusia ; hybridization ; mtDNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Interspecific hybridization occurs widelyacross a taxonomically diverse array of fishspecies. Multiple factors typically interactto effect the outcome of hybridization events. Human influences have been frequently cited ascontributing factors (nearly 50% of reviewedcase studies). Aquacultural activities,species introductions, and loss or alterationof habitats were frequently implicated. Wehighlight the utility of genetic markers andnovel methods of statistical analysis forinferring the extent, rate, direction, andlikely causes of hybridization. Emphasis isplaced on cytonuclear genetic systems. Wedemonstrate the utility of cytonuclear modelsfor hypothesis testing using empirical data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1016642723238
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  • 2
    Electronic Resource
    Electronic Resource
    Empirical evaluation of cytonuclear models incorporating genetic drift and tests for neutrality of mtDNA variants: data from experimental Gambusia hybrid zones (1999)
    Springer
    Genetica 105 (1999), S. 101-108 
    Details
    ISSN: 1573-6857
    Keywords: disequilibrium ; Gambusia ; genetic drift ; mtDNA ; neutrality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Statistical tests of genetic drift and of the neutrality of mtDNA are presented using empirical time‐series data on multi‐generational changes in cytonuclear disequilibria within replicated experimental hybrid populations of two species of live‐bearing Poeciliid fishes (Gambusia holbrooki and G.affinis) which were monitored over a period of two years (three generations). Cytonuclear disequilibria D and D (which measure departures from random associations of cytoplasmic and nuclear genotypes) over the three generations of the experiment were non‐zero for all replicate populations. For each of five nuclear loci, the observed measures of D and D were highly concordant between replicates during each generation. Significant departures from expectations were observed after one and two generations. A statistical measure of goodness of fit of observed changes in cytonuclear disequilibria (and implicitly of the neutrality of the mtDNA markers) was calculated for each nuclear locus. When the results for the replicates were combined into an overall test of neutrality, the fit to the random union of zygotes (RUZ) model was rejected for four of the five nuclear loci (P 〈 0.05). A simple genetic drift model does not explain the temporal changes in composite cytonuclear genotypic frequencies. Frequencies of parental G. holbrooki mitochondrial alleles and nuclear genotypes exceeded expected values during most time periods, implying some selective advantage of offspring produced by G. holbrooki females. Expansion of cytonuclear models to explicitly address questions of genetic drift and neutrality have general relevance to studies of natural populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003656610365
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    Paper (German National Licenses)
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