Karyotypic and Morphometric Studies of Tunisian Gerbillus

Jordan, Robert G.; Davis, Brent L.; Baccar, Hedia

doi:10.1515/mamm.1974.38.4.667

Cited by 18 publications

(20 citation statements)

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“…Kuryotypes (n = 3) are in agreement with those found in the Maghreb (Matthey 1953; Wassif, Ramsis and Lufty 1969;Jordan, Davis and Baccar 1974;Lay, Agerson and Nadler 1975) and Northern Mali (Dobigny et al 2001b). They are characterised by 2N = 56 chromosomes and NFa = 68.…”

Section: Gerbillus Carnpestris (Loche 1867)supporting

confidence: 83%

“…South of the Maghreb, G. gerbillus has only been karyotyped from Mauritania (Granjon et al 1997b). The karyotypes of the specimens from Niger (n = 5; 2N = 42/43; NFa = 72 and 74; X large submetacentric; Yl and Y2 meta-and submetacentric, respectively) are within the range described from Algeria (Matthey 1954), Tunisia (Jordan et al 1974), Morocco , Israel and Egypt (see review in Wahrman, Richler Brought to you by | The University of Auckland Library Authenticated Download Date | 5/27/15 5:28 AM and Ritte 1988). The XY1Y2 formula is the result of a double autosome-gonosome translocation studied in detail by Wahrman et ai (1988).…”

Section: Gerbillus Gerbillus (Olivier 1801)mentioning

confidence: 72%

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A cytotaxonomic survey of Rodents from Niger: implications for systematics, biodiversity and biogeography

Dobigny¹,

Nomao²,

Gautun³

2002

Mamm

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We here present an inventory of rodents from Niger, mainly based on cytotaxonomic data because of the presence of many groups providing sibling species. A total of 39 species are listed, one of which is a new chromosomal form (Talerillus sp.). Moreover, three other cytotypes already described but still not specifically attributed were found (Mastomys sp., Acomys sp. and Tatera sp). New karyotypic data are presented for Gerbillus nancillus, Graphiurus cf. pan^us, Massouteria mzabi, and Xerus erythropus. Once again, the efficiency of cytotaxonomy for small mammals inventories is enhanced.Specific distribution maps of poorly known species are thus completed. No clear gradients could be observed between what is currently defined as the West and the East African faunas. The distributions are mainly structured in a latitudinal manner. The Air massif appears as a continuous prolongation of the Sahelian area, rather than as a Sahelian refuge in the Sahara. Five biogeographical groups of species were distinguished: 1) a Sudanian group in the area receiving less than 700 mm rainfall, 2) a group of very widespread species largely overlapping the Sudanian (more than 700 mm rainfall) and the Sahelian areas, and sometimes including some Saharan localities, 3) a typical Saharan group, 4) some species infeoded to the mountainous Saharan area, and 5) few strictly commensal species. A global southward extension of several taxa confirms the desertification of the Sahel, as a result of both natural global warming and human activities.Resume. -Nous avons realise un inventaire des rongeurs du Niger qui s'appuie essentiellement sur des donnees cytotaxonomiques non ambigues ä cause de la presence de nombreux complexes d'especes jumelles. Trente neuf especes ont pu etre recensees, Tune d'entre-elles correspondant ä une nouvelle forme chromosomique de Taterillus. De plus, 3 cytotypes toujours sans attribution specifique ont ete retrouves (Mastomys sp., Tatera sp. et Acomys sp.) et des donnees caryotypiques nouvelles sont presentees pour Gerbillus nancillus, Graphiurus cf. parvus, Massouteria mzabi et Xerus erythropus. Les cartes de repartition de nombreuses especes peu connues Mammalia, t. 66, n° 4, 2002: 495-523. Brought to you by | The University of Auckland Library Authenticated Download Date | 5/27/15 5:28 AM 496 MAMMALIA sont completees. Aucun gradient n'est observe entre les faunes cTAfrique occidentale et celles d'Afrique Orientale, les especes se repartissant essentiellement en fonction de la latitude. Le massif de 1'A'ir apparait plutot comme un prolongement de la zone sahelienne que comme un refuge sahelien dans le Sahara. Parmi les especes de rongeurs inventoriees, cinq grands groupes biogeographiques peuvent etre distingues: 1) des especes infeodees ä la zone soudanienne recevant moins de 700 mm; 2) un groupe d'especes tres largement reparties de la zone soudanienne (plus de 700 mm) au nord de la zone sahelienne, et incluant parfois des localites sahariennes; 3) des especes typiquement sahariennes; 4) des especes infeodees ...

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Section: Gerbillus Carnpestris (Loche 1867)supporting

confidence: 83%

Section: Gerbillus Gerbillus (Olivier 1801)mentioning

confidence: 72%

A cytotaxonomic survey of Rodents from Niger: implications for systematics, biodiversity and biogeography

Dobigny¹,

Nomao²,

Gautun³

2002

Mamm

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“…The existence of such types of polymorphism was reported in many groups of animals (Matthey, 1963;Hsu & Arrighi, 1966& Nadler, 1969, including the genus Gerbillus (Jordan et al, 1974). The most significant finding from this study is the presence of intercellular variation rather than inter-specific variation.…”

Section: Discussionsupporting

confidence: 65%

Prevalence of non-Robertsonian polymorphism in the gerbil Gerbillus cheesmani from Kuwait

Bard

Asker

1980

Genetica

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“…A considerable number of individuals of this spe cies, from a wide range, has been sampled (our ob servations are based on more than 100 specimens; see also Matthey, 1955;Wassif et al, 1969;Jordan et al, 1974;Gamperl, 1979, personal com munication). No numerical chromosome differences have been reported.…”

Section: The Variable Chromosomes O F Gerbillus Gerbillusmentioning

confidence: 99%

The origin of multiple sex chromosomes in the gerbil <i>Gerbillus gerbillus </i>(Rodentia: Gerbillinae)

Wahrman¹,

Richler²,

Neufeld³

et al. 1983

Cytogenet Genome Res

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The sex chromosomes of the partly sympatric species of gerbils Gerbillus pyramidum and G. gerbillus (Mammalia: Gerbillinae) were investigated by a variety of light- and electron-microscope methods, including DNA replication banding and synaptonemal complex (SC) techniques. The sex-chromosome mechanism of G. pyramidum is of the JXY : XX type, whereas that of G. gerbillus is of the less common (JXYJY2 : XX system. The results include the demonstration that the X chromosomes of both species are compound. One segment is added to the X chromosome of G. pyramidum, leading to an increase in length from the standard 5% to approximately 7.3%, whereas two different extra segments increase the length of the X chromosome of G. gerbillus to approximately 11 % of the length of the haploid genome. In both cases the extra material is autosomal and is also represented in the respective Y chromosomes. Classifying heterochromatin by the variation in staining quality was helpful in elucidating the possible origin of the different chromosome segments, including the pericentromeric regions. Observations on meiotic chromosome pairing and chiasma formation have confirmed the homologies established by band comparisons. The occurrence of chiasmata between the sex chromosomes supports the autosomal origin of the pairing segments. These and other findings have been interpreted in the framework of a multistep evolutionary model. This sequence starts from a hypothetical pair of sex chromosomes, the X element of which amounts to 5% of the haploid genome, and leads through three translocations involving two pairs of autosomes and one pericentric inversion to the most complex situation of this series, manifested in G. gerbillus. The adaptive value, if any, of autosome incorporation into the sex chromosomes repeatedly occurring here is unknown. It is, however, a remarkable fact that in one species, G. gerbillus, the complex sex-chromosome constitution is conserved over vast geographic distances, and in the other, G. pyramidum, the compound X and Y chromosomes withstand change in the face of extreme autosome restructuring.

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Karyotypic and Morphometric Studies of Tunisian Gerbillus

Cited by 18 publications

References 0 publications

A cytotaxonomic survey of Rodents from Niger: implications for systematics, biodiversity and biogeography

A cytotaxonomic survey of Rodents from Niger: implications for systematics, biodiversity and biogeography

Prevalence of non-Robertsonian polymorphism in the gerbil Gerbillus cheesmani from Kuwait

The origin of multiple sex chromosomes in the gerbil <i>Gerbillus gerbillus </i>(Rodentia: Gerbillinae)

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