eCommons

 

A cytogenetic analysis of reproduction in common shrews (Sorex araneus) from a karyotypic hybrid zone

Other Titles

Abstract

Sixteen pregnant female common shrews were collected near Oxford (U.K.) from a hybrid zone between two karyotypic races which differ by Robertsonian rearrangements. Some females were homozygotes and others were ‘simple’ or ‘complex’ Robertsonian heterozygotes. The females and their fetuses were karyotyped and number of ovulations and regressing implants scored. Prenatal losses were noted in female simple Robertsonian heterozygotes. Some losses, including two trisomics, were likely to be due to anaphase I nondisjunction of the maternal autosomal trivalent. However, numbers of ovulations were found to be higher in these heterozygotes than in the homozygotes, and this could compensate for prenatal losses due to nondisjunction. Overall, fertility of females from the hybrid zone did not differ substantially from that of females from other areas of karyotypic polymorphism or monomorphism. There was no evidence for assonative mating or assortative fertilisation within the hybrid zone. On chromosomal grounds, the hybrid zone is unlikely to be a major barrier to gene flow.

Journal / Series

Volume & Issue

Description

Sponsorship

Natural Environment Research Council and the Royal Society of London

Date Issued

1990-12

Publisher

Mendelian Society of Lund

Keywords

Location

Effective Date

Expiration Date

Sector

Employer

Union

Union Local

NAICS

Number of Workers

Committee Chair

Committee Co-Chair

Committee Member

Degree Discipline

Degree Name

Degree Level

Related Version

Related To

Related Part

Based on Related Item

Has Other Format(s)

Part of Related Item

Related To

Related Publication(s)

Link(s) to Related Publication(s)

References

Link(s) to Reference(s)

Previously Published As

Hereditas (1990), 113: 121-132

Government Document

ISBN

ISMN

ISSN

Other Identifiers

Rights

Rights URI

Types

article

Accessibility Feature

Accessibility Hazard

Accessibility Summary

Link(s) to Catalog Record