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Abstract Detail


Clavijo, Laura [1], Zuluaga-Trochez, Alejandro [2], Clark, John L. [3].

Patterns of geographic diversification in the Andean-centered genus Drymonia (Gesneriaceae).

The tropical Andes are one of the most important biodiversity hotspot on Earth, and are center of diversification of numerous plant lineages, including Neotropical Gesneriaceae. The genus Drymonia ranges from southern Mexico to Bolivia, including the Caribbean, northern Brazil, and Guyana, with the highest diversity found in cloud forests of northern Andes and southern Central America. Here, we estimate the age and geographical origin of Drymonia and its closest relatives (i.e., core Andean-centered clade) to explore the patterns of geographic diversification in the genus. We estimate a Mid-Miocene origin for the core Andean-centered clade with a subsequent rapid diversification in the Tropical Andes during the late Miocene that led to the origin of the species richest genera in the clade (i.e., Columnea and Drymonia). The origin of Drymonia is estimated to be around 10.48 Mya in the Tropical Andes, during a period of intensive mountain buildup. In Drymonia, diversification took place mainly in the Tropical Andes with subsequent movements to and between the coastal Pacific plain and Central America. A recent dispersal (~3.8 Mya) gave rise to the Amazon clade, which is characterized by the presence of laterally compressed flowers. Based on the patters of morphological and range evolution found here, we suggest that biotic (e.g., interactions with distinct pollinators) and abiotic factors (e.g., topographical and environmental changes during the Andes uplift) may have played major roles in the diversification of Drymonia.

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1 - University Of Alabama, Biological Sciences, P.O. Box 870345, 425 Mary Harmon Bryant Hall, Tuscaloosa, AL, 35487-0345, USA
2 - Universidad del Valle, Biology, Calle 13 # 100-00, Cali, Colombia
3 - The University of Alabama, Box 870345, Tuscaloosa, ALABAMA, 35401, United States


Presentation Type: Oral Paper
Session: 37, Biogeography II
Location: 103/Savannah International Trade and Convention Center
Date: Wednesday, August 3rd, 2016
Time: 11:15 AM
Number: 37013
Abstract ID:834
Candidate for Awards:None


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