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Out of Africa: Miocene Dispersal, Vicariance, and Extinction within Hyacinthaceae Subfamily Urgineoideae

Journal of Integrative Plant Biology 2013年第10期55卷 950-964页

作者： Syed Shujait Ali Martin Pfosser Wolfgang Wetschnig Mario Martínez Azorín Manuel B.Crespo Yan Yu Institute of Plant Sciences Karl Franzens University Graz Biocenter Linz Institute of Biotechnology and Microbiology University of Swat CIBIO (Instituto Universitario de la Biodiversidad) Universidad de Alicante Key Laboratory of Bio Resources and Eco Environment of Ministry of Education College of Life Sciences Sichuan University

Disjunct distribution patterns in plant lineages are usually explained according to three hypotheses： vicariance, geodispersal, and long-distance dispersal. The role of these hypotheses is tested in Urgineoideae （Hyacinthaceae）, a subfamily disjunctly distributed in Africa, Madagascar, India, and the Mediterranean region. The potential ancestral range, dispersal routes, and factors responsible for the current distribution in Urgineoideae are investigated using divergence time estimations. Urgineoideae originated in Southern Africa approximately 48.9 Mya. Two independent dispersal events in the Western Mediterranean region possibly occurred during Early Oligocene and Miocene （29.9-8.5 Mya） via Eastern and Northwestern Africa. A dispersal from Northwestern Africa to India could have occurred between 16.3 and 7.6 Mya. Vicariance and extinction events occurred approximately 21.6 Mya. Colonization of Madagascar occurred between 30.6 and 16.6 Mya, after a single transoceanic dispersal event from Southern Africa. The current disjunct distributions of Urgineoideae are not satisfactorily explained by Gondwana fragmentation or dispersal via boreotropical forests, due to the younger divergence time estimates. The flattened winged seeds of Urgineoideae could have played an important role in long- distance dispersal by strong winds and big storms, whereas geodispersal could have also occurred from Southern Africa to Asia and the Mediterranean region via the so-called arid and high-altitude corridors.

关键词： bayesian binary method bayesian divergence estimates biogeography disjunct distribution time-event curve Urgineoideae.

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