The maritime shrew, Sorex maritimensis (Insectivora : Soricidae): a newly recognized Canadian endemic.

Détails

ID Serval
serval:BIB_6FE5237C3CC4
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
The maritime shrew, Sorex maritimensis (Insectivora : Soricidae): a newly recognized Canadian endemic.
Périodique
Canadian Journal of Zoology
Auteur(s)
Stewart D.T., Perry N. D., Fumagalli L.
ISSN
0008-4301
Statut éditorial
Publié
Date de publication
2002
Peer-reviewed
Oui
Volume
80
Numéro
1
Pages
94-99
Langue
anglais
Résumé
Previous morphological and cytological analyses have suggested that the arctic shrew (Sorex arcticus) as currently recognized may be two distinct species. Specifically, those studies demonstrated considerable differentiation between the putative subspecies S. a. maritimensis and one or both of the other two subspecies, S. a. arcticus and S. a. laricorum. Phylogenetic analysis of 546 base pairs of cytochrome b sequence data from 10 arctic shrews from across Canada indicates that maritimensis is the sister-group to arcticus + laricorum. Furthermore, there is considerable genetic divergence between maritimensis and the other two putative subspecies (similar to8-9%; Kimura's two-parameter distance). Given that maritimensis and arcticus + laricorum appear to be reciprocally monophyletic clades with considerable genetic divergence (i.e., greater than that between other recognized pairs of sister-species within the S. araneus-arcticus group), we propose that S. maritimensis be recognized as a distinct species. The proportion of third-position transversion substitutions between S. arcticus and S. maritimensis suggests that these two species shared a common ancestor approximately 2.4 million years ago.
Mots-clé
CYTOCHROME-B GENE, EVOLUTION, SEQUENCES
Web of science
Création de la notice
24/01/2008 19:09
Dernière modification de la notice
20/08/2019 14:28
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