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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


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