Mitochondrial DNA sequences reveal extensive cryptic diversity within a western American springsnail

We analysed cytochrome c oxidase subunit I and NADH dehydrogenase subunit I sequence variation among 29 populations of a widely ranging southwestern springsnail (Pyrgulopsis micrococcus) and 18 regional congeners. Cladistic analyses of these sequences depict P. micrococcus as a polyphyletic composit...

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Bibliographic Details
Published in:Molecular ecology 2003-10, Vol.12 (10), p.2771-2782
Main Authors: Liu, Hsiu-Ping, Hershler, Robert, Clift, Kayla
Format: Article
Language:English
Subjects:
Animals
Base Sequence
Bayes Theorem
Body Weights and Measures
California
Cluster Analysis
cryptic species
DNA Primers
DNA, Mitochondrial - genetics
Evolution, Molecular
freshwater
Gastropoda
Genetic Variation
Geography
Likelihood Functions
Micrococcus
Models, Genetic
Molecular Sequence Data
mtDNA
Nevada
phylogenetics
Phylogeny
Pyrgulopsis
Pyrgulopsis micrococcus
Sequence Analysis, DNA
Snails - anatomy & histology
Snails - genetics
Species Specificity
western North America
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Summary:We analysed cytochrome c oxidase subunit I and NADH dehydrogenase subunit I sequence variation among 29 populations of a widely ranging southwestern springsnail (Pyrgulopsis micrococcus) and 18 regional congeners. Cladistic analyses of these sequences depict P. micrococcus as a polyphyletic composite of five well‐supported clades. Sequence divergences among these clades and subclades imply the possible occurrence of as many as seven or eight cryptic species in addition to P. micrococcus. Our finding that P. micrococcus contains multiple, genetically distinct and geographically restricted lineages suggests that diversification within this highly speciose aquatic genus has been structured in large part by the operation of terrestrial barriers to gene flow. However, these sequence data also indicate that recent dispersal among hydrographically separated areas has occurred within one of these lineages, which we attribute to passive transport on migratory waterbirds.
ISSN:0962-1083
1365-294X
DOI:10.1046/j.1365-294X.2003.01949.x