Abstract:
:We examined, through allozyme electrophoresis, the genetic structure of populations 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 (0 = 0.044, 95% CI: 0.004-0.068). Hybrid populations are genetically more similar to the Southern race (0 = 0.008, 95% CI: -0.005-0.018) than to Northern ones (0 = 0.018, 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 those groups, in spite of their geographical vicinity with northern race populations.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Chiappero MB,Parise C,Martí DA,Bidau CJ,Gardenal CNdoi
10.1046/j.1420-9101.2004.00649.xkeywords:
subject
Has Abstractpub_date
2004-01-01 00:00:00pages
76-82issue
1eissn
1010-061Xissn
1420-9101pii
649journal_volume
17pub_type
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