Abstract Detail


Mansaray, Janet [1], Frost, Laura [2], Bedoya, Ana Maria [1], Lagomarsino, Laura [1].

A phylogenomic baseline to study the evolution of extreme floral curvature in Centropogon subgenus Centropogon (Campanulaceae).

Centropogon subgenus Centropogon (Campanulaceae), a clade of 65 species that occur in low-to-mid elevation forests in the Neotropics, has some of the most curved flowers among all angiosperms. The curvature represents coevolution with the sicklebill hummingbird (Eutoxeres: Trochilidae), which is an obligate pollinator of most (but not all) species of Centropogon subgenus Centropogon. To understand the evolution of this curvature, as by extension, the gain and losses of this fascinating ecological relationship, I inferred the first phylogenomic hypotheses of the clade. This research builds on a previous phylogenetic hypothesis of the clade that included limited taxon sampling (i.e., 20 out of 65 species) that demonstrates the monophyly of the subgenus and the non-monophyly of many widespread species (a notable exception is C. cornutus, the species with the broadest range that falls sister the rest of the eucentropogonids). I improved on the previous phylogeny by more than doubling taxon sampling (i.e., 46 out of 65 species) using targeted sequence capture with probes designed to isolated low-copy nuclear loci Neotropical bellflowers. I applied phylogenetic methods that incorporate incomplete lineage sorting and introgression as these evolutionary processes are likely important in the clade, which represents a young, rapid radiation. Applying ancestral state reconstruction, I demonstrate that the evolution of floral curvature in Centropogon subgenus Centropogon has been very labile, suggesting multiple losses of sicklebill pollination. This phylogeny will form the foundation for additional macroevolutionary studies to understand the abiotic and biogeographic context in which extreme floral curvature evolves.

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2 - 2543 Carter Grove Road, Hazel Green, AL, 35750, United States
3 - Louisiana State University, Biological Sciences, 202 Life Sciences Building, Baton Rouge, Louisiana, 70803, USA
4 - Louisiana State University, Biological Sciences, 202 Life Sciences Bldg, Baton Rouge, LA, 70803, United States

none specified

Presentation Type: Oral Paper
Number: PHYLO III004
Abstract ID:904
Candidate for Awards:None

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