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
URL:
http://dx.doi.org/10.1007/BF00005895
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