The biogeography of Lessoniaceae,with special reference to Macrocystis C. Agardh (Phaeophyta: Laminariales) |
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Authors: | N. K. M. Chin M. T. Brown M. J. Heads |
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Affiliation: | (1) Botany Department, University of Otago, Dunedin, New Zealand |
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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. |
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Keywords: | Lessoniaceae Macrocystis Pacific Ocean biogeography vicariance |
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