Chromosomal evolution and zoogeographic origin of southeast Asian shrews (genus Crocidura).

Détails

ID Serval
serval:BIB_F27B817E84FB
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Chromosomal evolution and zoogeographic origin of southeast Asian shrews (genus Crocidura).
Périodique
Experientia
Auteur(s)
Ruedi M., Vogel P.
ISSN
0014-4754 (Print)
ISSN-L
0014-4754
Statut éditorial
Publié
Date de publication
1995
Volume
51
Numéro
2
Pages
174-178
Langue
anglais
Résumé
To the origins and evolution of Indomalayan shrews, we investigated the chromosomal variations of 14 species of Crocidura from SE Asia. Intraspecific polymorphism was mainly due to variation in the number of short chromosomal arms but C. lepidura and C. hutanis showed a polymorphism due to a centric fusion. The undifferentially stained karyotypes were similar in 9 species, all possessing 2n = 38 and FN = 54-56 (68); C. fuliginosa had 2n = 40 and FN = 54-58. These karyotypes are close to the presumed ancestral state for the genus Crocidura. Four species from Sulawesi had a reduced diploid number (2n = 30-34), a trend not observed among other SE Asian species but present in few Palaearctic taxa. Compared to the apparent stasis of karyotypic evolution observed among other SE Asian species, the high degree of interspecific differences reported among Sulawesian shrews is unusual and needs further investigation. Stasis and reduction in diploid number found in both Indomalayan and Palaeractic species suggest that these two groups share a common ancestry. This is in sharp contrast to most Afrotropical species which evolved towards higher diploid and fundamental numbers. The zoogeographical implications of these results are discussed.
Mots-clé
Animals, Asia, Southeastern, Biological Evolution, Bone Marrow/ultrastructure, Chromosomes, Female, Genetic Variation, Karyotyping, Male, Polymorphism, Genetic, Shrews/genetics
Pubmed
Web of science
Création de la notice
24/01/2008 18:32
Dernière modification de la notice
03/03/2018 22:40
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