Burke, Janelle , Nicolas, Antoine , Michelangeli, Fabian .
Escape from buzz-pollination: phylogeny and character evolution among Andean Miconia (Melastomataceae).
Diversification and phytogeographic patterns in the Andes have long been an area of research and intrigue. Within Miconia, a megadiverse Neotropical genus, a clade of ca. 350 species has radiated in the Andes and the Caribbean. The anthers of most species of Miconia have a terminal, minute pore, requiring buzz pollination for pollen release. Of the species in this Andean clade, the majority exhibit broad pores or slits; a departure from the more common syndrome in Miconia and the rest of Melastomataceae. We present a phylogeny of the predominately Andean clade, reconstructed with two nuclear ribosomal genes (ETS, ITS) and four plastid intergenic spaces (trnS-G, psaI-accD, atpH-F and psbK-L). The Andean clade consists of members from three of eleven taxonomic sections of Miconia: Amblyarrhena, Chaenopleura,and Cremanium, as well as some species currently in the genera Clidemia and Killipia. Two of these three sections, Miconia sect. Chaenopleura and Miconia sect. Cremanium, are characterized by large, broad pores or slits, whereas members of Miconia sect. Amblyarrhena have a minute pore. The taxonomic sections are not resolved as monophyletic; instead we see multiple instances of evolution of broader pores or slits from a small or minute-pored ancestor. In addition, there are also evolutionary shifts in androecial symmetry from zygomorphic to antinomorphic and from yellow or colored anthers to white. Dioecy, rare in Melastomataceae, has evolved multiple times among the Andean Miconia. Within the predominately Andean clade, the Caribbean members of section Chaenopleura (anthers with longitidunal slits) form a monophyletic group. The phylogeny also elucidates species radiations at smaller geographic scales within the Andes.
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1 - The New York Botanical Garden, 2900 Southern Blvd., Pfizer Lab, Bronx, NY, 10458, USA
2 - New York Botanical Garden, Institute Of Systematic Botany, 2900 Southern Blvd., Bronx, NY, 10458-5126, USA
3 - The New York Botanical Garden, Institute of Systematic Botany, 2900 Southern Blvd., Bronx, NY, 10458, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Franklin A/Hyatt
Date: Monday, July 9th, 2012
Time: 4:15 PM