Abstract Detail
After the book - Progress in parasitic plant research since Kuijt's Biology of Parasitic Flowering Plants (1969) Malécot, Valéry [1]. Biogeography of Olacaceae - paleobotanical and phylogenetic congruence. Olacaceae is commonly regarded as the most primitive family among Santalales, the largest order of woody angiosperms. This family was assumed to originate during late Cretaceous, as several tribes show disjunct pantropical distributions, in agreement with an early differentiation before the separation of the continents in the Late Cretaceous. Morphological and molecular phylogenetic studies, as well as a comprehensive survey of fossil material (pollen fossil genus Anacolosidites) allows us to propose an 80 million year long biogeographic history compatible with tectonic and climatic changes. Current and fossil data show that members of tribe Anacoloseae have always existed in regions with tropical or paratropical climates. This hypothesis, also applicable to other tribes, allows us to propose that the present pantropical distribution is the result of splitting of climatic areas, a concept similar to Wolfe's boreotropical hypothesis on the origin of tropical floras. A preliminary survey suggest that this scheme may also be applicable to some other Santalales and other tropical families.
1 - Institut National d'Horticulture, UMR A 462 & Dept. Sciences Biologiques, 2 rue le Notre, Angers, 49000, France
Keywords: 18S rDNA 26S rDNA matK rbcL biogeography paleopalynology paleobotany phylogeny reconstruction Santalales Olacaceae Anacolosidites dipersal and vicariance boreotropical hypothesis.
Presentation Type: Symposium Session: 16-2 Location: Ballroom 2 (Cliff Lodge) Date: Monday, August 2nd, 2004 Time: 1:30 PM Abstract ID:802 |