The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae)
Several aspects of the population biology and the population genetic structure of Ctenomys porteousi were studied. Chromosomal and allozyme polymorphisms in two local populations separated by 10 km were used to infer genetic structure. Heterochromatic addition/deletion rearrangements for six autosom...
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1992
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03051978_v20_n8_p723_Massarini http://hdl.handle.net/20.500.12110/paper_03051978_v20_n8_p723_Massarini |
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paper:paper_03051978_v20_n8_p723_Massarini2023-06-08T15:30:35Z The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae) allozymes chromosomal polymorphism Ctenomys genetic structure population biology subterranean rodents Several aspects of the population biology and the population genetic structure of Ctenomys porteousi were studied. Chromosomal and allozyme polymorphisms in two local populations separated by 10 km were used to infer genetic structure. Heterochromatic addition/deletion rearrangements for six autosomal pairs were employed as genetic markers. Allozyme variants were analysed by the study of thirty-one presumptive loci. Thirteen loci (43%) were polymorphic, average observed heterozygosity per locus was 10%, and mean number of alleles per locus was 1.57. Chromosomal and allozyme frequencies were homogeneous across populations. The estimated Fst values were very low, 0.009 and 0.022 for chromosomal and allozyme data respectively. Gene flow was indirectly estimated by the method of Wright, Nm values (mean number of migrants per generation per deme) was very high (27.2 and 11.3 for chromosomal and allozyme data respectively). The Fis values suggest a significant defect of heterozygotes that could be explained by the Wahlund effect. The ecological data indicate the occurrence of sharp changes in density and in distribution pattern in short time. The genetic and ecological data suggest that the population structure of C. porteousi differs from that found in other species of Ctenomys affected by chromosomal mechanisms of speciation. © 1992. 1992 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03051978_v20_n8_p723_Massarini http://hdl.handle.net/20.500.12110/paper_03051978_v20_n8_p723_Massarini |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
allozymes chromosomal polymorphism Ctenomys genetic structure population biology subterranean rodents |
| spellingShingle |
allozymes chromosomal polymorphism Ctenomys genetic structure population biology subterranean rodents The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae) |
| topic_facet |
allozymes chromosomal polymorphism Ctenomys genetic structure population biology subterranean rodents |
| description |
Several aspects of the population biology and the population genetic structure of Ctenomys porteousi were studied. Chromosomal and allozyme polymorphisms in two local populations separated by 10 km were used to infer genetic structure. Heterochromatic addition/deletion rearrangements for six autosomal pairs were employed as genetic markers. Allozyme variants were analysed by the study of thirty-one presumptive loci. Thirteen loci (43%) were polymorphic, average observed heterozygosity per locus was 10%, and mean number of alleles per locus was 1.57. Chromosomal and allozyme frequencies were homogeneous across populations. The estimated Fst values were very low, 0.009 and 0.022 for chromosomal and allozyme data respectively. Gene flow was indirectly estimated by the method of Wright, Nm values (mean number of migrants per generation per deme) was very high (27.2 and 11.3 for chromosomal and allozyme data respectively). The Fis values suggest a significant defect of heterozygotes that could be explained by the Wahlund effect. The ecological data indicate the occurrence of sharp changes in density and in distribution pattern in short time. The genetic and ecological data suggest that the population structure of C. porteousi differs from that found in other species of Ctenomys affected by chromosomal mechanisms of speciation. © 1992. |
| title |
The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae) |
| title_short |
The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae) |
| title_full |
The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae) |
| title_fullStr |
The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae) |
| title_full_unstemmed |
The population genetic structure of Ctenomys porteousi (Rodentia: Octodontidae) |
| title_sort |
population genetic structure of ctenomys porteousi (rodentia: octodontidae) |
| publishDate |
1992 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03051978_v20_n8_p723_Massarini http://hdl.handle.net/20.500.12110/paper_03051978_v20_n8_p723_Massarini |
| _version_ |
1768542176084492288 |