Ferns on Oceanic Islands - From Dispersal to Long Lasting Diversity
Vogel, Johannes C. , Duraes, Cecilia , Ansell, Stephen , Grundmann, Michael , Rumsey, Fred , Russell, Stephen J. , Gibby, Mary , Pinter, Istvan , Schneider, Harald .
Patterns and processes of pteridophyte evolution in Macaronesia.
The Macaronesian Islands, Azores, Canary Islands and Madeira, are situated in the Atlantic Ocean between Europe, Africa and America. The island groups are of different age and support a great diversity of pteridophytes. We used phylogeny, population genetics, phylogeography, biosystematics and cytology to unravel the evolution of pteridophytes in these archipelagos. Four prominent examples of Macaronesian ferns are 1) the genus Dryopteris with several diploid and tetraploid taxa showing endemism, European and north American affiliations, 2) polyploidy in Asplenium trichomanes (one 2x, three 4x, two 6x) and again European and north American affiliations, 3) polyploidy in Asplenium ceterach (4x-8x) with Europe and Asian affiliations and 4) the widespread, but Macaronesian endemic diploid Asplenium hemionitis. We will use these examples to explore wider issues of origins and relationships of the different pteridophytes floras and the interesting evolutionary patterns and processes that have shaped this diversity.
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1 - Natural History Museum, Department of Botany, Cromwell Road, London, SW7 5BD, England
2 - Natural History Museum, Botany, Cromwell Road, London, SW7 5BD, united kingdom
3 - Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, United Kingdom
4 - Eoetvoes Lorand University, Genetics, Budapest, H 1088, Hungary
5 - Natural History Museum, Cromwell Road, London, SW7 5BD, UK
Presentation Type: Symposium or Colloquium Presentation
Location: Lake Michigan/Hilton
Date: Tuesday, July 10th, 2007
Time: 10:00 AM