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  • vicariance  (1)
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    ISSN: 1573-5117
    Keywords: Lessoniaceae ; Macrocystis ; Pacific Ocean ; biogeography ; vicariance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The bipolar distributions of Lessoniaceae and Macrocystis have been explained by migration out of a ‘centre of origin’ and across the tropics by means of dispersal, but controversy centres on the issue: which sector is the true centre of origin? We provide biological, palaeo-oceanographic and geological evidence that leads us to reject the centre of origin/migration theory and methodology in explaining ‘bipolarity’. As an alternative, a process of vicariant differentiation out of a Pacific Ocean/Southern Ocean ancestral complex is proposed. Moreover the biogeographic relationship between the southwest and northeast Pacific is shown to be a general phenomenon and not restricted to marine algae.
    Type of Medium: Electronic Resource
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