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Biogeography: molecular trails from hitch-hiking snails
Edmund Gittenberger1, Dick S J Groenenberg, Bas Kokshoorn
1National Museum of Natural History Naturalis, PO Box 9517, 2300 RA Leiden, The Netherlands.
Nature
|January 27, 2006
Summary
Land snails, Balea, surprisingly dispersed across oceans via birds. Molecular phylogenetics reveals transequatorial journeys from Europe to remote islands and back, challenging their slow-moving reputation.
Area of Science:
- Evolutionary Biology
- Zoology
- Molecular Phylogenetics
Background:
- Charles Darwin noted bird-assisted land snail dispersal across oceans.
- Land snails are typically considered poor long-distance dispersers.
Purpose of the Study:
- To investigate the transequatorial dispersal of the land snail genus Balea.
- To trace the evolutionary history and geographic movements of Balea using molecular data.
Main Methods:
- Molecular phylogenetic analysis of Balea specimens.
- DNA sequencing and comparative analysis to infer dispersal routes.
Main Results:
- Confirmed incredible transequatorial dispersal of Balea snails.
- Identified dispersal events between Europe, the Azores, and Tristan da Cunha islands.
- Revealed bidirectional gene flow and complex migration patterns.
Conclusions:
- Balea snails exhibit remarkable long-distance dispersal capabilities, challenging previous assumptions.
- Bird-mediated transport is a plausible mechanism for such extensive geographic ranges.
- This study highlights the dynamic nature of species distribution and evolution.
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