The anagenetic world of spore-producing land plants

Jairo Patiño, Mark Carine, José María Fernández-Palacios, Rüdiger Otto, Hanno Schaefer, Alain Vanderpoorten

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

Summary: A fundamental challenge to our understanding of biodiversity is to explain why some groups of species diversify, whereas others do not. On islands, the gradual evolution of a new species from a founder event has been called 'anagenetic speciation'. This process does not lead to rapid and extensive speciation within lineages and has received little attention. Based on a survey of the endemic bryophyte, pteridophyte and spermatophyte floras of nine oceanic archipelagos, we show that anagenesis, as measured by the proportion of genera with single endemic species within a genus, is much higher in bryophytes (73%) and pteridophytes (65%) than in spermatophytes (55%). Anagenesis contributed 49% of bryophyte and 40% of endemic pteridophyte species, but only 17% of spermatophytes. The vast majority of endemic bryophytes and pteridophytes are restricted to subtropical evergreen laurel forests and failed to diversify in more open environments, in contrast with the pattern exhibited by spermatophytes. We propose that the dominance of anagenesis in island bryophytes and pteridophytes is a result of a mixture of intrinsic factors, notably their strong preference for (sub)tropical forest environments, and extrinsic factors, including the long-term macro-ecological stability of these habitats and the associated strong phylogenetic niche conservatism of their floras.

Original languageEnglish
Pages (from-to)305-311
Number of pages7
JournalNew Phytologist
Volume201
Issue number1
DOIs
StatePublished - Jan 2014

Keywords

  • Anagenesis
  • Bryophytes
  • Cladogenesis
  • Diversification
  • Endemism
  • Niche conservatism
  • Oceanic islands
  • Pteridophytes

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