. Bonner zoologische Monographien. Zoology. 211 a (I || II lA Aft U ft* II Q* fil Ä & A* ** A* A A A* 6* *A M M. : Karyotype of female A. somalicus with rearrangement in the 1st pair of autosomes: a: routine staining; b: C-band staining of the 1st pair of A. dembeensis, found earlier at three localities in Ethiopia (Orlov et al. 1989, 1992, Baskevich et al. 1995, Corti et al. 1996; table 1). Obviously the same karyotype will be found in the specimens of A. dembeensis from Awash National Park where the ranges of these two species overlap (Yalden et al. 1976). We believe that the chromo
. Bonner zoologische Monographien. Zoology. 211 a (I || II lA Aft U ft* II Q* fil Ä & A* ** A* A A A* 6* *A M M. : Karyotype of female A. somalicus with rearrangement in the 1st pair of autosomes: a: routine staining; b: C-band staining of the 1st pair of A. dembeensis, found earlier at three localities in Ethiopia (Orlov et al. 1989, 1992, Baskevich et al. 1995, Corti et al. 1996; table 1). Obviously the same karyotype will be found in the specimens of A. dembeensis from Awash National Park where the ranges of these two species overlap (Yalden et al. 1976). We believe that the chromosomal peculiarities do not play an important role as an isolating mechanism among these sympatric species. But if they play a role in isolation their contribution is restricted to heterochromatin pattern only. In addition to the 62-chromosome A. dembeensis, a 60-chromosome Arvicanthis () and a 56-chromosome Arvicanthis (sp. 2) have been distinguished in Ethiopia (table 1), all representing the "morphotype" of A. dembeensis. The first one has been recorded in the south of the Ethiopian Rift Valley, the second coexists with the 62-chromosomes A. dembeensis in the Gambella area. Distinct karyological forms within the morphotype of A. dembeensis in different localities of Ethiopia seem to correspond to relict populations, isolated from the rest of the species by dry areas since the last wet period. This assumption agrees with the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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