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Biogeographic diversification in Nolana(Solanaceae),a ubiquitous member of the Atacama and Peruvian Deserts along the western coast of South America

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Journal of Systematics and Evolution 2009年第5期47卷 457-476页

作者： Michael O.DILLON victor quipuscoa sil.estre Department of Botany The Field Museum1400 South Lake Shore DriveChicagoIL 60605USA Departamento de Botánica Universidad Nacional de San Agustín

The present paper reconstructs the biogeographic diversification for Nolana L.f.(Solanaceae),a genus of 89 endemic species largely restricted to fog-dependent desert lomas formations of coastal Peru and *** efforts have reconstructed a phylogenetic estimate for Nolana using a combination of molecular ***,we expand on those results to examine hypotheses of biogeographic origins and diversification *** occupies habitats within a continuous coastal desert and forms a terrestrial archipelago of discrete "islands" unique in size,topography,and species *** locality contains at least one Nolana species and many contain multiple species in *** genus has a Chilean origin,with the basal clades confined to Chile with wide geographic and ecological *** contains two strongly supported clades,suggesting two introductions with subsequent radiation.A Chilean clade of shrubby,small-flowered species appears to have had its origins from the same ancestors of the second line that radiated in Peru and northern *** galapagensis is endemic to the Islas Gala’pagos,with origins traced to Peruvian taxa with a divergence time of 0.35 *** of diversification over the past 4.02 mya in Nolana,in one of the driest habitats on Earth,suggest rapid adaptive radiation in several *** in Nolana may be attributed to characters that confer a competitive advantage in unpredictable and water-dependent environments,such as succulent leaf anatomy and ecophysiology,and the reproductive mericarp unique to *** processes affecting or shaping the biota of western South America are discussed.

关键词： Atacama Desert biogeography chloroplast DNA LEAFY second intron Nolana Peruvian Desert Solanaceae South America.

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