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.