A species delimitation approach in the Trochulus sericeus/hispidus complex reveals two cryptic species within a sharp contact zone.

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Version: Final published version
Serval ID
serval:BIB_6E4594B21383
Type
Article: article from journal or magazin.
Collection
Publications
Title
A species delimitation approach in the Trochulus sericeus/hispidus complex reveals two cryptic species within a sharp contact zone.
Journal
BMC Evolutionary Biology
Author(s)
Dépraz A., Hausser J., Pfenninger M.
ISSN
1471-2148[electronic], 1471-2148[linking]
Publication state
Published
Issued date
2009
Peer-reviewed
Oui
Volume
9
Number
171
Pages
171
Language
english
Abstract
BACKGROUND: Mitochondrial DNA sequencing increasingly results in the recognition of genetically divergent, but morphologically cryptic lineages. Species delimitation approaches that rely on multiple lines of evidence in areas of co-occurrence are particularly powerful to infer their specific status. We investigated the species boundaries of two cryptic lineages of the land snail genus Trochulus in a contact zone, using mitochondrial and nuclear DNA marker as well as shell morphometrics. RESULTS: Both mitochondrial lineages have a distinct geographical distribution with a small zone of co-occurrence. In the same area, we detected two nuclear genotype clusters, each being highly significantly associated to one mitochondrial lineage. This association however had exceptions: a small number of individuals in the contact zone showed intermediate genotypes (4%) or cytonuclear disequilibrium (12%). Both mitochondrial lineage and nuclear cluster were statistically significant predictors for the shell shape indicating morphological divergence. Nevertheless, the lineage morphospaces largely overlapped (low posterior classification success rate of 69% and 78%, respectively): the two lineages are truly cryptic. CONCLUSION: The integrative approach using multiple lines of evidence supported the hypothesis that the investigated Trochulus lineages are reproductively isolated species. In the small contact area, however, the lineages hybridise to a limited extent. This detection of a hybrid zone adds an instance to the rare reported cases of hybridisation in land snails.
Keywords
Animals, Bayes Theorem, Cell Nucleus/genetics, Cluster Analysis, DNA, Mitochondrial/genetics, Evolution, Molecular, Genetic Markers, Genetic Speciation, Genetics, Population, Haplotypes, Sequence Analysis, DNA, Snails/anatomy & histology, Snails/genetics, Species Specificity
Pubmed
Web of science
Open Access
Yes
Create date
11/02/2010 15:45
Last modification date
20/08/2019 14:27
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