Go to Naturalis.nl

Search results

Query: keyword: "geographic variation"

AuthorsJ.W. Arntzen, Graham P. Wallis
TitleGeographic variation and taxonomy of crested newts (Triturus cristatus superspecies): morphological and mitochondrial DNA data
JournalContributions to Zoology
Volume68
Year1999
Issue3
Pages181-203
ISSN1383-4517
Keywordsasymmetric hybridisation; biogeography; crested newt; geographic variation; morphology; mtDNA; taxonomy; Triturus cristatus
AbstractWithin the newt genus Triturus, the large-bodied species in the T. cristatus (crested newt) superspecies show an unusual degree of variation in relative trunk length as a result of among-taxon variation in interlimb vertebral count. Here we examine the systematic value of this feature as assessed by both exterior measurement (Wolterstorff Index) and direct radiographic count of rib-bearing vertebrae, with particular reference to a number of confounding factors (sex differences, hybridisation, geographic variation, allometry, preservation effects). Using our mtDNA haplotype data, which are largely concordant with geographic distribution of species, we find that direct count of the rib-bearing vertebrae performs more reliably (14% misclassification) than external measurement (31% misclassification) as a species identifier. We therefore recommend this feature as a taxonomic tool, although (like external measurement) it breaks down near hybrid zones. To account for the observed biogeographical pattern and phenotype – genotype discrepancies, a scenario is presented that combines the movement of the contact zone between taxa with asymmetric hybridisation. This scenario applies to species interactions in eastern Yugoslavia and western France.
Document typearticle
Download paperpdf document http://www.repository.naturalis.nl/document/571951