Brittonia

, Volume 59, Issue 2, pp 159–181

Origin and diversification of African ferns with special emphasis on Polypodiaceae

  • Thomas Janssen
  • Hans-Peter Kreier
  • Harald Schneider
IBC 2005 Fern Symposium

Abstract

Although Africa harbors low species diversity compared to the neotropics or South East Asia, the African fern flora is of interest because of its specific composition and geographic location between the neotropics and Asia. We address the question of how the evolution of the African fern flora may have been enriched by repeated input from the neotropics and Asia. For the purpose of this paper we consider ihree major biogeographic regions: the neotropics, Africa and Madagascar, and Asia including Malesia and Australasia. We interpret distribution data for six clades of Polypodiaceae in a molecular phylogenetic framework. We conclude that African fern taxa shared with or closely related to ones in the neotropics or Asia have been brought about by ancient and recent dispersal events with or without subsequent speciation. The African fern flora is interpreted as being composed of endemic, neotropical, and Asian elements and as being situated in a zone of overlap of typical neotropical and Asian fern floras.

Key Words

Africa dispersal ferns historical biogeography polygrammoids vicariance 

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Copyright information

© The New York Botanical Garden 2007

Authors and Affiliations

  • Thomas Janssen
    • 1
    • 2
  • Hans-Peter Kreier
    • 1
  • Harald Schneider
    • 1
  1. 1.Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Abt. Spezielle BotanikGeorg-August-Universität GöttingenGöttingenGermany
  2. 2.Muséum national d'Histoire naturelle, Dépt. Systématique et EvolutionUMR-CNRS 5202/USM 0602Paris cedex 05France

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