oa African Entomology - Supernumerary heterochromatin in Oedaleus carvalhoi Bolivar (Orthoptera: Acrididae)
Two populations of Oedaleus carvalhoi Bolivar were analysed to detennine the occurrence and stability of two supernumerary heterochromatin segment systems. Segments were commonly located tenninally on chromosomes M9 and S10. The segments displayed size variation, and stained uniformly darkly following C-banding. No effect from inbreeding could be detected in any of the samples. The segment systems of the Ouikerspan population proved to be stable over a period of three years, the frequency of the segments exhibiting no significant change (M9: qs 0.50-0.68; S10: qs = 0.61... 0.67). Significant interpopulation differences were, however, present. Segments were notably more frequent at Ouikel'span than in the Baviaanspoort population, possibly reflecting the different environmental factors influencing the two populations. Alternatively, these differences could represent the age of the polymorphism in the respective populations.
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