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Biogeography: molecular trails from hitch-hiking snails
Authors:Gittenberger Edmund  Groenenberg Dick S J  Kokshoorn Bas  Preece Richard C
Institution:National Museum of Natural History Naturalis, PO Box 9517, 2300 RA Leiden, The Netherlands.
Abstract:Darwin was fascinated by the transportation of land snails across great swathes of open ocean by birds--he even immersed snails in sea water to see how long they would survive. Here we follow a molecular phylogenetic trail that reveals the incredible transequatorial dispersal of the land snail Balea from Europe to the Azores and the Tristan da Cunha islands, and back again. This long-distance dispersal is unexpected for what are proverbially considered the most pedestrian of creatures.
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