A CLADISTIC ANALYSIS OF THE EVOLUTION AND BIOGEOGRAPHY OF DURVILLAEA (PHAEOPHYTA) 1

• Published in: Journal of Phycology
• Main Authors: Cheshire, Anthony C., Conran, John G., Hallam, Neil D.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1995
• Subjects: Antarctic; New Zealand; Antarc*; Antarctica; Antipodes Islands
• Online Access: http://dx.doi.org/10.1111/j.1529-8817.1995.tb02561.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.1995.tb02561.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.1995.tb02561.x

ABSTRACT The genus Durvillaea currently has four recognized species found along many exposed, rocky coastlines of the temperate to sub‐Antarctic regions in the Southern Hemisphere. We propose that the current species distributions are related primarily to vicariance events and subsequent speciation associated with the breakup of Gondwana between 40 and 100 Ma. From an ancestral species, a stipitate species developed in the Tasman basin, with separation and speciation resulting in the D. potatorum/ D. willana complex in southeastern Australia and New Zealand. A second line of evolution led to D. chathamensis and D. antarctica characterized by a honeycombed medulla. The extensive distribution of D. antarctica throughout the Southern Hemisphere is related to both vicariance and dispersal events. The status of D. chathamensis as a species distinct from D. antarctica is questioned. The affinities of an as yet undescribed taxon from the Antipodes Islands are thought to be with the D. potatorum complex but require further study before they can be defined more precisely .