 |
| Titel |
Towards a global historical biogeography of Palms |
| VerfasserIn |
Thomas Couvreur, William J. Baker, Jean-Marc Frigerio, Pierre Sepulchre, Alain Franc |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250153631
|
| Publikation (Nr.) |
 EGU/EGU2017-18631.pdf |
|
|
|
|
|
| Zusammenfassung |
| Four mechanisms are at work for deciphering historical biogeography of plants : speciation,
extinction, migration, and drift (a sort of neutral speciation). The first three mechanisms are
under selection pressure of the environment, mainly the climate and connectivity of land
masses. Hence, an accurate history of climate and connectivity or non connectivity between
landmasses, as well as orogenesis processes, can shed new light on the most likely speciation
events and migration routes driven by paleogeography and paleoclimatology. Currently, some
models exist (like DIVA) to infer the most parsimonious history (in the number of migration
events) knowing the speciation history given by phylogenies (extinction are mostly
unknown), in a given setting of climate and landmass connectivity. In a previous project, we
have built in collaboration with LSCE a series of paleogeographic and paleoclimatic maps
since the Early Cretaceous. We have developed a program, called Aran, which
enables to extend DIVA to a time series of varying paleoclimatic and paleogeogarphic
conditions. We apply these new methods and data to unravel the biogeographic history of
palms (Arecaceae), a pantropical family of 182 genera and >2600 species whose
divergence is dated in Late Cretaceous (100 My). Based on a robust dated molecular
phylogeny, novel paleoclimatic and paleogeographic maps, we will generate an
updated biogeographic history of Arecaceae inferred from the most parsimonious
history using Aran. We will discuss the results, and put them in context with what is
known and needed to provide a global biogeographic history of tropical palms. |
|
|
|
|
|
|