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Rare hybridization and introgression in smooth and palmate newts (Salamandridae: Triturus vulgaris and T. helveticus)

Arntzen, JW, deWijer, P, Jehle, R, Smit, E and Smit, J 1998, 'Rare hybridization and introgression in smooth and palmate newts (Salamandridae: Triturus vulgaris and T. helveticus)' , Journal of Zoological Systematics and Evolutionary Research, 36 , pp. 111-122.

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    Abstract

    This paper describes the occurrence of hybridization and introgression in two species of amphibians (the newts Trifurus helrelicus and Trirurus culgaris) in mid-Wales, northern France and western France. A single aberrant adult male with intermediate phenotype was found. The multivariate analysis of 14 morphometric and two meristic characters supported its hybrid status. Electrophoretic analysis of 42 protein loci showed a genetic distance of 0.57 _+ 0.14 Nei units between the species and revealed 15 diagnostic loci. The aberrant specimen was heterozygous at 1 I of those and most likely to be a F, hybrid. Four marker loci appeared homozygous, suggesting the presence of enzymatically non-active (‘null‘) alleles. The analysis of (maternally inherited) mitochondrial DNA showed the hybrid to be the offspring of a T. heltleticus mother (and a T. vulgaris father). This observation does not conform to expectations based on the species composition in the pond from which the hybrid was collected. No F, hybrids were observed in a large sample (n > 5000) of larvae, recently metamorphosed newts and adults using two diagnostic protein loci. Occasionally alleles characteristic for one species were observed in the gene pool of the other species, suggesting the presence of bidirectional introgression. However, the frequency of alien genes was low (maximally 0.07%) which renders it difficult to rule out alternative explanations conclusively. The increase in total genetic variation in T. helveticus and T. vulgaris due to gene flow between them is negligible.

    Item Type: Article
    Uncontrolled Keywords: Genetic variation - hybridization - introgression - mitochondrial DNA - multivariate analysis - newts - null alleles - protein electrophoresis- spatial autocorrelation - Triturus heli~eticu-s Triturus ciulgaris
    Themes: Subjects / Themes > Q Science > QL Zoology
    Subjects / Themes > Q Science > QH Natural history > QH301 Biology
    Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Science & Technology
    Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences
    Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
    Journal or Publication Title: Journal of Zoological Systematics and Evolutionary Research
    Publisher: Blackwell Publishing
    Refereed: Yes
    ISSN: 1439-0469
    Depositing User: Users 29196 not found.
    Date Deposited: 30 Oct 2009 15:22
    Last Modified: 20 Aug 2013 17:00
    URI: http://usir.salford.ac.uk/id/eprint/2406

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