Skip to main content

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

Buy Article:

$50.00 plus tax (Refund Policy)

Abstract:

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 (~8–9%; 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. araneusarcticus 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.

Des analyses morphologiques et cytologiques antérieures laissent déjà croire que la musaraigne arctique (Sorex arcticus) est peut-être un complexe de deux espèces. Plus spécifiquement, ces études démontrent qu'il y a une différenciation considérable entre la sous–espèce putative S. a. maritimensis et l'une des deux autres sous-espèces, S. a. arcticus et S. a. laricorum, ou les deux. L'analyse phylogénétique de 546 paires de bases provenant de données sur la séquence du cytochrome b chez 10 musaraignes de diverses régions du Canada indique que maritimensis est le groupe soeur d'arcticus + laricorum. De plus, il existe une divergence génétique considérable entre maritimensis et les deux autres sous-espèces putatives (~8–9%; distance à deux paramètres de Kimura). Comme maritimensis et arcticus + laricorum semblent former deux clades monophylétiques distincts, à divergence génétique importante (i.e., supérieure à celle qui existe entre des paires connues de sous-espèces au sein du groupe S. araneus–arcticus), nous proposons ici la promotion de S. maritimensis au rang d'espèce. La proportion de substitutions de transversion à la troisième position entre S. arcticus et S. maritimensis indique que les deux espèces ont probablement eu un ancêtre commun il y a environ 2,4 millions d'années.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: January 1, 2002

More about this publication?
  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • ingentaconnect is not responsible for the content or availability of external websites
nrc/cjz/2002/00000080/00000001/art00013
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more