INVESTIGADORES
GARDENAL Cristina Noemi
artículos
Título:
Distribution of allozymic genetic variability in populations from two chromosomal races and their hybrid zone of Dichroplus pratensis (Melanoplinae, Acrididae).
Autor/es:
CHIAPPERO, M.B.; PARISE, C.; MARTÍ, D.A., BIDAU, C.J. Y GARDENAL, C.N.
Revista:
JOURNAL OF EVOLUTIONARY BIOLOGY
Editorial:
Blackwell Publishing Ltd
Referencias:
Año: 2004 vol. 17 p. 76 - 82
ISSN:
1010-061X
Resumen:
We examined, through allozyme electrophoresis, the genetic structure ofpopulations of the acridid grasshopper Dichroplus pratensis from two chromosomal races (Northern and Southern) and their hybrid zone in Argentina. No fixed alleles for any particular race were found, although genetic differentiation among parental races was significant (Theta= 0.044, 95% CI:0.004-0.068). Hybrid populations are genetically more similar to the Southern race (Theta 0.008, 95% CI: -0.005-0.018) than to Northern ones (Theta0.018,95% CI: 0.002-0.030). Differential viability or fertility of hybrids, or asymmetry in mating preferences in favour of one particular cross would cause a higher proportion of matings between hybrid individuals and those from the Southern race. This would explain the high genetic similarity between thosegroups, in spite of their geographical vicinity with northern race populations.