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Abstract Detail


Sidoti, Brian [1], Cameron, Ken [2].

The phylogenetic, population genetic, and biogeographic patterns of the Tillandsia fasciculata (Bromeliaceae) complex.

The Tillandsia fasciculata (Bromeliaceae) complex is a taxonomically challenging group due to a suite of morphological characters that complicate the accurate diagnosis of its members. We take an inter- and intraspecific approach to determine evolutionary patterns within this complex, which spans throughout the biodiversity hotspot of the Caribbean Basin and comprises eight subspecific varieties, 22 supravarietal taxa of uncertain rank, and three natural hybrids. The aims of this study are to 1) evaluate the circumscription and phylogenetic position of the Tillandsia fasciculata complex, as well as determine relationships within the complex, using a multigene approach; 2) examine the complex’s genetic variation and population structure in Florida and the Bahamas; and 3) model the past, present, and projected occurrence of T. fasciculata in geographic space. Concatenated data incorporating six ptDNA, rDNA (ETS), and a single low-copy nuclear gene (PRK) clarify some taxonomic questions pertaining to the group, but others remain unresolved. Geography, more than morphology, plays an important role in delimiting several problematic taxa. Based on eight microsatellite loci, we identify at least three population clusters in the T. fasciculata complex from its northern limit in Florida and through the Bahamas (n = 18 sites). Species distribution models generated using MaxEnt support hypothesized past distributions, such as T. fasciculata var. clavispica in Mexico and northern Central America. Future climatic conditions suggest suitable localities outside its current distribution; however, urbanization and rising sea level pose far greater risks than these models capture.

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1 - University Of Wisconsin-Madison, 244 Birge Hall, 430 Lincoln Drive, Madison, WI, 53706-1381, USA
2 - University Of Wisconsin - Madison, Botany, 430 Lincoln Drive, Madison, WI, 53706, USA

population genetics

Presentation Type: Oral Paper
Session: 45, Monocots part B/Basal Eudicots
Location: 200/Savannah International Trade and Convention Center
Date: Wednesday, August 3rd, 2016
Time: 1:30 PM
Number: 45001
Abstract ID:573
Candidate for Awards:None

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