El editor no permite incluir ninguna versión del artículo en el Repositorio.
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor


Genetic variability measured by allozymic electrophoresis has been studied in several species of the subterranean rodent genus Ctenomys (Octodontidae). The study was carried out with the main purpose of analysing a special group known as the ‘Corrientes group’ which inhabits the province of Corrientes in Argentina. The members of the group are, with high probability, isolated reproductively due to their karyotypic differences diploid numbers are between 42 and 70). To evaluate whether the chromosomal differences were the causes of speciation or if they arose a posteriori, we compared the level of the genetic distance among taxa within the orrientes group with all those measured between intraspecific populations in Ctenomys. The results indicate that the distances among the populations of the Corrientes group are at or below the level of those measured among traspecific populations in Ctenomys. Thus, it is unlikely that genetic differentiation triggered speciation. It is shown that this low level of genetic differentiation is not in contradiction with the high levels expected for species originating from one of the possible mechanisms of chromosomal speciation named, chromosomal transilience. Although for geographical reasons it seems obviousthat gene flow is precluded among the members of the Corrientes group, the Slatkin method for estimating Nm values was also used. Because high values of Nm exist but no isolation by distance could be detected, it is suggested that reproductive and geographical isolation are very ecent. Finally, analysis of population variability suggests that the high levels of heterozygosity observed (a) can be explained by the population structure, and (b) are within the range of expected values if bottlenecks have occurred in the recent history of the Corrientes group. As a general conclusion, the results indicate that in the Corrientes group the genetic data support a putative causal role for chromosomes in speciation. Copyright © 1994, Wiley Blackwell. All rights reserved


Documento: Artículo
Título:A study of genetic distances and variability in several species of the genus Ctenomys (Rodentia: Octodontidae) with special references to a probable causal role of chromosomes in speciation
Filiación:Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria Nuñez, Buenos Aires, 1428, Argentina
Palabras clave:allozymes; bottle n; cladistic analysis; gene flow; genetic variability; local populations; Subterranean rodents
Página de inicio:189
Página de fin:208
Título revista:Biological Journal of the Linnean Society
Título revista abreviado:Biol. J. Linn. Soc.


  • Apfelbaum, LI, Massarini, A, Daleffe, LE, Reig, OA, Genetic variability in the subterranean rodents Cfenomys australis and Ctenomys porfeousi (Rodentia: Octodontidae) (1991) Biochemical Systematics and Ecohgy, 19, pp. 467-476
  • Apfelbaum, LI, Reig, OA, Allozyme genetic distances and evolutionary relationships in species of akodontine rodents (Cricetidae: Sigmodontinae) (1989) Biological Journal of the Linnean Society, 38, pp. 257-280
  • Capanna, E., Robertsonian numerical variation in animal speciation: Mus musculus as an emplematic model (1982) Mechanisms ofspecialion, pp. 155-177. , Berigozzi C, New York:, Allan R. Liss Inc
  • Callardo, MH, Palma, RE, Intra‐ and interspecific genetic variability in Ctenomys (Rodentia: Ctenomyidae) (1992) Biochemical Systematics and Ecology, 20, pp. 523-534
  • King, M., Chromosome change and speciation in lizards (1981) Euolution and speciation, pp. 262-285. , Atcheley WR, Woodruff D, London:, Cambridge University Press
  • Massarini, A, Barros, MA, Ortells, MO, Reig, OA, Evolutionary biology of fossorial Ctenomyine rodents (Caviomorpha: Octodontidae). I. Chromosomal polymorphism and small karyotypic differentiation in Central Argentinian populations of two‐tucos (1991) Genetica, 83, pp. 131-144
  • Mickevich, MF, Johnson, MS, Congruence between morphological and allozyme data in evolutionary inference and character evolution (1976) Systematic Zoology, 25, pp. 260-270
  • Moreira, DM, Franco, MHLP, Freitas TROY Weimer, TA, Biochemical polymorphisms and phenetic relationships in rodents of the genus Ctenomys from southern Brazil (1991) Biochemical Genetics, 29, pp. 601-615
  • Mueller, DL, Ayala, FJ, Estimation and interpretation of genetic distance in empirical studies (1982) General Research, 40, pp. 127-137
  • Nei, M., Genetic distance between populations (1972) The American Naturalist, 106, pp. 283-291
  • Nei, M., Analysis of gene diversity in subdivided populations (1973) Proceedings of the National Academy of Sciences, 70, pp. 3321-3323
  • Nei, M., Estimation of average heterozygosity and genrtic distance from a smaller number of individuals (1978) Genetics, 89, pp. 583-590
  • Nei My Maruyama, T, Chakraborty, R., The bottleneck effect and genetic variability in populations (1975) Euolution, 29, pp. 1-10
  • Nevo, E, Beiles, A, Ben‐Shlomo, R., (1984), pp. 13-213. , The evolutionary significance of genetic diversity: ecological, demographic and life history corrclates. In:, Mani GS, ed. Euolutionary dynamics of genetic diversity. Lectures Notes in Biomathemalics; Nevo, E, Filippucci, MG, Beiles, A., Genetic diversity and its ecological correlates in nature: comparisons between subterranean, fossorial, and aboveground small mammals (1990) Euolutlon of subterranean mammals at the organismal and molecular level, pp. 347-366. , Nevo E, Reig OA, New York:, Allan R. Liss, Inc
  • Nevo, E, Tchernov, E, Beiles, A., Morphometrics of speciating mole rats: adaptive difrerentiation in ecological speciation (1988) Zeitschrifl fur Zoologische Systematik und Euolutions for shun, 26, pp. 286-314
  • Ortells, MO, (1990), Biologia evolutiva del género Ctenomys. Buenos Aires: Doctoral thesis, Universidad de Buenos Aires; Ortells, MO, (1994), Phylogenetics analysis of G‐banded karyotypes among South American subterranean rodents of the genus Ctenomys (Caviomorpha: Octodontidae), with special reference to chromosomal evolution and speciation. Biological journal of the Linnean Society (in press); Ortells, MO, Contreras, JR, Reig, OA, New Ctenomys karyotypes (Rodentia, Octodontidae) from north‐eastern Argentina and from Paraguay confirm the extreme chromosomal multirormity of thr grnus (1990) Genetica, 82, pp. 189-201
  • Patton, JL, Chromosomal and genic divergence, population structure and speciation potrntial in Thomomys bottae pocket gophers (1981) Ecología y genética de la especiación animal, pp. 255-295. , Reig OA, Venezuela:, Equinoccio, Universidad Simon Bolivar
  • Patton, JL, Feder, JH, Genetic divergence between populations of the pocket gopher, Thomomys umbrinus (Richardson) (1978) Zeitshrift fur Saugetierkunde, 43, pp. 17-30
  • Patton, JP, Feder, JH, Microspatial genetic‐heterogeneity in pocket gophers– nonrandom breeding and drift (1981) Euolution, 35, pp. 912-920
  • Patton, JL, Sherwood, SW, Genome evolution in pocket gophers (Genus Thomomys). I. Heterochromatin variation and speciation potential (1982) Chromosoma (Berlin), 83, pp. 149-162
  • Patton, JL, Yang, SY, Genetic variation in Thomomys bottae and Thomomys townsendii in northeastern California (1977) Evolution, 31, pp. 697-720
  • Reig, OA, Karyotypic repatterning as a triggering factor in cases of explosive speciation (1989) Euolutionary biology of transient, unstable populations, pp. 246-289. , Fontdrvila A, Berlin Heidelberg:, Springer‐Verlag
  • Reig, OA, Busch, C, Ortells, MO, Contreras, JR, An overview of evolution, systematics, population biology and speciation in Ctenomys (1990) Biology of subterranean mammals at the organismal and molecular leuels, pp. 71-96. , Nevo E, Reig OA, New York:, Allan R. Liss Inc
  • Reig, OA, Massarini, A, Ortells, MO, Barros, MA, Tiranti, SI, Dyzenchaliz, FJ, New karyotypes and C‐banding patterns of the subterranean rodents of the genus Ctenomys (Caviomorpha, Octodontidae) from Argentina (1992) Mammalia, 56, pp. 603-623
  • Rogers, JS, Measures of genetic similarity and genetic distance (1972) Universily of Texas Publications, 7213, pp. 145-153
  • Sage, ROY, Contreras, JR, Roig, W, Patton, JL, Genetic variation in the South American burrowing rodents of the genus Ctenomys (Rodentia: Ctenomyidae) (1986) Zeitshrfit fur Saugetierkunde, 51, pp. 158-172
  • Sattler, PW, Hilburn, LR, A program of calculating genetic distance, and its use in determining significance difference in genetic similarity between two groups of populations (1985) Journal of Heredity, 76, p. 400
  • Selander, RK, Genetic variation in natural populations (1976) Molecular evolution, , Ayala J, Sunderland, M.A.:, Sinauer
  • Selander, RK, Smith, MH, Yang, SY, Johnson, WE, Gentry, IV. Biochemical polymorphism and systematics in the genus Peromyscus. I. Variation in the old‐field mouse Peromyscus polionotus (1971) Studies in Genetics VI University of Texas Publications, 7103, pp. 49-90
  • Simon, C, Archie, J, An empirical demonstration of the lability of heterozygosity estimates (1985) Evolution, 39, pp. 463-467
  • Sites, JW, Jr, Moritz, C., Chromosomal evolution and speciation revisited (1987) Systematic Zoology, 36, pp. 153-174
  • Slatkin, M., Isolation by distance in equilibrium and non‐equilibrium populations (1993) Evolution, 47, pp. 264-279
  • Swofford, DL, (1985) PAUP. Phylogenetic analysis using parsimony, version 2.4., , Champaign Illinois:, Illinois Natural Survey
  • Swofford, DL, Selander, RK, BIOSYS‐1: A ortran program for the comprehensive analysis of electrophoretic data in population genetics and systematics (1981) Journal of Heredity, 72, pp. 281-283
  • Swofford, DL, Berlocher, SH, Inferring evolutionary trees from gene frequency data under the principal of maximum parsimonyu (1987) Systematic Zoology, 36, pp. 293-325
  • Templeton, AR, Modes of speciation and inferences based on genetic distances (1980) Evolution, 34, pp. 719-729


---------- APA ----------
ORTELLS, M.O. & BARRANTES, G.E. (1994) . A study of genetic distances and variability in several species of the genus Ctenomys (Rodentia: Octodontidae) with special references to a probable causal role of chromosomes in speciation. Biological Journal of the Linnean Society, 53(2), 189-208.
---------- CHICAGO ----------
ORTELLS, M.O., BARRANTES, G.E. "A study of genetic distances and variability in several species of the genus Ctenomys (Rodentia: Octodontidae) with special references to a probable causal role of chromosomes in speciation" . Biological Journal of the Linnean Society 53, no. 2 (1994) : 189-208.
---------- MLA ----------
ORTELLS, M.O., BARRANTES, G.E. "A study of genetic distances and variability in several species of the genus Ctenomys (Rodentia: Octodontidae) with special references to a probable causal role of chromosomes in speciation" . Biological Journal of the Linnean Society, vol. 53, no. 2, 1994, pp. 189-208.
---------- VANCOUVER ----------
ORTELLS, M.O., BARRANTES, G.E. A study of genetic distances and variability in several species of the genus Ctenomys (Rodentia: Octodontidae) with special references to a probable causal role of chromosomes in speciation. Biol. J. Linn. Soc. 1994;53(2):189-208.