Title
Cytogenetics of the genus **Arvicanthis** (Rodentia, Muridae) : 3 : comparative cytogenetics of **A-neumanni** and **A-nairobae** from Tanzania Cytogenetics of the genus **Arvicanthis** (Rodentia, Muridae) : 3 : comparative cytogenetics of **A-neumanni** and **A-nairobae** from Tanzania
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
The Hague ,
Subject
Human medicine
Source (journal)
Genetica. - The Hague
Volume/pages
118(2003) :1 , p. 33-39
ISSN
0016-6707
ISI
000181764800005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The African rats of the genus Arvicanthis have been widely studied during recent years to clarify species boundaries and phylogenetic relationships. The wide chromosomal variability of the genus has been highlighted in several studies, with each accepted species characterised by its individual karyotypes and others being revealed as cryptic species. In the present paper we report the karyotype and the C- and G-banding patterns of the two species A. nairobae and A. neumanni from seven localities of Tanzania, an area of the range poorly studied. The two karyotypes were compared to that of A. niloticus, which is considered to be primitive. The karyotype of A. neumanni is characterised by 2n = 53-54 and NFa = 62. This karyotypic variability depends on a widespread Robertsonian polymorphism. The karyotype of A. nairobae shows 2n = 62 and NFa = 78; it diverges from that of A. niloticus through one reciprocal translocation, five inversions and three heterochromatic additions. The comparison with the karyotypes of other species of the genus showed that A. neumanni belongs to the east African lineage (with A. abyssinicus, A. blicki, A. niloticus), while A. nairobae is closer to the central and the west African representatives which were all previously under the name of A. niloticus (ANI-2, ANI-3, ANI-4). The distribution of A. nairobae in east Africa opens new scenarios in the biogeographical pattern of evolution of the genus.
E-info
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