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Abstract Detail


Biogeography

Martin, Gracie [1], Kress, W [2], Specht, Chelsea [3], Driscoll, Heather [4], Lopez, Ida [5], Fraley, Sara [1], Gupta, Shalika [3].

An analysis of speciation modes within Heliconiacea: a biogeographical approach.

Heliconiaceae (Zingiberales) containing the single genus Heliconia, is a family of rhizomatous herbs with most species occurring in Centraland South American tropics and a few species native to Southeast Asian tropics.Heliconiaceae is a recently diverging lineage inclusive of some 215 extant species, and as such provides a rapidly radiating group from which to study modes of speciation and the processes that govern distribution and variation. Based on a recently completed 7-marker molecular phylogeny of Heliconia we compare distributions and ecological niches of sister species belonging to recently established Central American clades hypothesized to have arrived in this location as a result of two different distribution routes and at two different times. This information matched with ancestral distributions generated by dispersal-vicariance analyses (DIVA), molecular dating and Spatial Evolutionary and Ecological Vicariance Analysis (SEEVA) for Heliconia are then used to test hypotheses on modes of speciation within Heliconia. The results of these analyses provide a unique insight into the role of niche conservatism versus niche divergence in speciation within Heliconiaceae. This study relies on newly available digitalized herbaria collections and the resources available at the Smithsonian, Botany Department paired with newly developed analytical methods.

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1 - University of California, Berkeley, Plant and Molecular Biology, College of Natural Resources, 111 Koshland Hall, Berkeley, CA, 94720, USA
2 - Smithsonian Institution, Botany, MRC-166 National Museum Of Natural History, PO Box 37012, WASHINGTON, DC, 20013-7012, USA
3 - University of California, Berkeley, Plant and Molecular Biology, College of Natural Resources, 431 Koshland Hall, Berkeley, CA, 94720, USA
4 - Department Of Botany, 572 Dwight Place, Berkeley, CA, 94704, USA
5 - Smithsonian Institution, National Museum of Natural History, Botany, 1400 Constitution Ave NW, Washington, DC, 20013, USA

Keywords:
Heliconiaceae
Biogeography
Ecological niche modeling
speciation
Heliconia
GIS
herbarium data
Species distribution modeling
niche conservatism.

Presentation Type: Oral Paper:Papers for Topics
Session: 05
Location: Lindell A/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 10:30 AM
Number: 05008
Abstract ID:749


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