• Manuel Ruiz-Garcia

      Articles written in Journal of Genetics

    • Genetic relationships among some new cat populations sampled in Europe: A spatial autocorrelation analysis

      Manuel Ruiz-Garcia

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      The allelic frequencies of nine Mendelizing genetic characteristics that control coat colour, tabby and length and some skeletal abnormalities have been studied in four feral domestic cat populations, two in the north of Catalonia (Girona and Roses & L’Estartit, northeastern Spain) and two Adriatic Italian populations (Rimini and Venice). Using different genetic and multivariate analyses (Nei’s and Cavalli-Sforza and Edwards’s genetic distances, phenograms and cladograms using different algorithms, strict consensus trees, canonical population, principal coordinates and nonmetric multidimensional scaling analyses), I show the genetic relationships between these populations and other Western European cat populations previously studied. In the Western European area comprising Catalonia, Italy, France and Great Britain, I found significant spatial structure for thetb, l andW alleles and for the average correlogram for the seven alleles studied as a whole using a spatial autocorrelation analysis. The genetic distance matrices between these European cat populations also showed a significant correlation with the geographical distance between these populations using Mantel’s test. These analyses showed that in each of these countries, local cat populations have characteristic genetic profiles which were different to neighbouring populations in nearby countries. At least in this area of Western Europe, the geographical distances between cat populations (although the gene flow can be relatively high) is an important factor which can explain differences in allele frequencies between these populations.

    • Genetic structure of populations of the domestic cat in Catalonia (Spain) and upper midwestern USA: A microgeographic and macrogeographic study

      Manuel Ruiz-Garcia Keith K. Klein

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      The genetic structure of natural populations of the domestic cat was examined at the microgeographic level (in the Spanish city of Barcelona) and the macrogeographic level (in Catalonia in Spain, and in upper midwestern USA) using frequency data for seven monogenic morphological traits. At the microgeographic level in the city of Barcelona there was no evidence for nonrandom mating within colonies, and estimates of between-colony gene flow were quite high. At the macrogeographic level, the populations from Catalonia and upper midwestern USA differed in two major respects: (i) The Catalan populations were in reasonably good agreement with expectations of Hardy-Weinberg equilibrium while the North American populations showed some evidence of the Wahlund effect (overall heterozygote deficiency indicating population substructuring). (ii) In the Catalan populations, approximately fifty per cent of the genetic differentiation between populations could be explained by geographical separation while in North America only four per cent of the total differentiation was attributable to geographical distance.

    • Population genetic analysis of cat populations from Mexico, Colombia, Bolivia, and the Dominican Republic: Identification of different gene pools in Latin America

      Manuel Ruiz-Garcia Diana Alvarez Joseph M. Shostell

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      In this paper we identify new genetic profiles of eight Latin American cat populations. In addition, we combine data from the present study and previously published data on 70 other American and European populations to discuss (1) the points of introduction of mutant alleles for cat coat phenotypes from Europe into Latin America, (2) the heterozygosity levels at these loci in the current Latin American cat populations, (3) the level of genetic heterogeneity among Latin American cat populations, and how this compares with levels found in North American and European cat populations, and (4) how many different cat gene pools are currently present in Latin America. We also include in our purview historical records of human migrations from Europe to and within the Americas. Our analyses clearly support the view that the current genetic profiles and structuring of cat populations in Latin America can be largely explained by the historical migration patterns of humans.

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