INVESTIGADORES
CHIAPPERO Marina Beatriz
artículos
Título:
Allozymic polymorphism and genetic differentiation among populations of Calomys musculinus and Calomys laucha (Rodentia: Muridae) from eastern Argentina
Autor/es:
GARDENAL, C.N; DE LUCA D'ORO, G. M.; CHIAPPERO, M.B.; MILLS, J.N.
Revista:
MAMMALIAN BIOLOGY
Editorial:
ELSEVIER GMBH
Referencias:
Año: 2002 vol. 67 p. 294 - 303
ISSN:
1616-5047
Resumen:
The genetic variability and divergence among natural populations of Calomys musculinus and C. lau­cha from eastern Argentina were examined by protein electrophoresis of 24 loci. High levels of ge­netic variability were found in both species when compared to other rodents and mammals. Mean expected heterozygosity (He) ranged from 0.112 to 0.156, proportion of polymorphic loci (P95%) from 37.5% to 50% and mean number of alleles per locus (A) of 1.6±1.7 for C. musculinus.He from 0.097 to 0.126, P95% from 34.8 to 39.1 and A from 1.7 to 1.9 were the values for C. laucha. Popu­lations of this last species revealed a higher degree of geographical differentiation (Fst = 0.017, P < 0.05) than those of C. musculinus (Fst = 0.002, P > 0.05). These results are in agreement with the known social structure and habitat of both species. C. musculinus is an opportunistic species, with a loose social structure and a predominance of transient over resident animals, indicating a high ambulatory activity. C. laucha, on the contrary, inhabits almost exclusively cultivated fields, and evidence of social stratification has been reported for this species.