Systematic and biogeographic relationships of the Japanese white-toothed shrew (Crocidura dsinezumi)

Détails

ID Serval
serval:BIB_CBD0DE84E0C0
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Systematic and biogeographic relationships of the Japanese white-toothed shrew (Crocidura dsinezumi)
Périodique
Journal of Mammalogy
Auteur(s)
Ruedi M., Maddalena T., Vogel P., Obara Y.
ISSN
0022-2372
Statut éditorial
Publié
Date de publication
1993
Volume
74
Numéro
3
Pages
535-543
Langue
anglais
Résumé
To assess the zoogeographic and phylogenetic relationships of C. dsinezumi, its systematic position has been investigated through electrophoretic comparisons. These comparisons comprise typical Indomalayan and Palaearctic species, including C. russula, the supposed sister taxon of the Japanese white-toothed shrew. The range of measured genetic distances that separate dsinezumi from the other shrews (Nei's D = 0.232-0.406) is typical for interspecific comparisons among Crocidura taxa. Our results reinforce morphologic considerations that suggest C. dsinezumi be treated as a valid species. Phylogenetic relationships deduced from a cladistic treatment of allozyme data refute the possibility that the western Palaearctic C. russula is the sister taxon of C. dsinezumi. Zoogeographic interpretation of the genetic results indicates that the Southeast Asian representatives constitute a clade distinct from one that includes the Palaearctic species. However, C. dsinezumi is difficult to assign to either clade due to many intermediate or plesiomorphic electrophoretic characters. Unlike the major karyologic and biochemical separation that divides Afrotropical and Palaearctic species, the subdivision between Palaearctic and Indomalayan Crocidura is not correlated with any trend in karyotypic evolution. It also is shown that the Eurasiatic species of Crocidura possessing 2n = 40 chromosomes (including C. dsinezumi) do not represent a particular clade, but probably share a plesiomorphic character. Further analysis of other Indian or Asiatic species is needed to test whether the Palaearctic versus Indomalayan separation is due to real zoogeographic barriers or whether it is the result of limited samples.
Mots-clé
CROCIDURA, PHYLOGENETICS, CLADISTICS, ZOOGEOGRAPHY, ALLOZYMES
Web of science
Création de la notice
24/01/2008 18:33
Dernière modification de la notice
03/03/2018 21:27
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