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Abstract Detail


Evolution on Islands: a colloquium to honor the careers of Daniel Crawford and Tod Stuessy

Meerow, Alan [1], Francisco-Ortega, Javier [2], Calonje, Michael [3], Salas-Leiva, Dayana [2], Stevenson, Dennis [4], Griffith, Patrick [3].

Comparative patterns of genetic variation among populations of the Zamia pumila L.complex across three islands of the Greater Antilles.

The Zamia pumila L. complex is a diploid (2n=16) clade of populations restricted to the West Indies and Florida currently considered to encompass one polymorphic or nine distinct species. We are extensively genotyping populations of the group throughout its range with both microsatellite DNA (SSR) and single copy nuclear genes. Here, we analyze 16 SSR loci across three of the larger islands of the Greater Antilles: Hispaniola (Dominican Republic [DR]), Jamaica and Puerto Rico (PR). Of the three, PR has the greatest morphological diversity, with three species recognized by some accounts, two of which are reported from Jamaica and one from the DR. PR has the highest gene diversity. Some populations in Jamaica show indications of genetic erosion,with evidence of poaching and reduced population size. Mean pairwise FST and DESTbetween populations is lowest in the DR, which we attribute to high levels of gene flow. In PR, while DESTvalues among three populations each of Z. portoricensis and Z. pumila are 0.026 and 0.037, respectively, the mean among four populations of Z.erosa = 0.186, a 6-8 fold higher level of inter-populational differentiation. Genetic distance resolves all of the Jamaican populations nested within Z. erosa from PR, with the DR populations as a sister cluster. This may indicate Pre-Colombian human inter-island movement of plants, since Jamaica and Puerto Rico have never had a land connection,and Zamia has limited long-distance dispersal capability. While DR and Jamaica have similar gene diversities, only a single private allele characterizes the DR populations vs. 32 and 34, respectively, for PR and Jamaica. Preliminary phylogeographic analysis with single copy nuclear genes supports admixture between Puerto Rican and Dominican zamia, with Jamaican populations originating from Puerto Rican genotypes.

Broader Impacts:


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1 - USDA-ARS-SHRS, UNITED STATES DEPARTMENT OF AGRICULTURE, 13601 Old Cutler Road, Miami, FL, 33158, USA
2 - Florida International University, Biological Sciences, OE167 - University Park, Miami, FL, 33199, USA
3 - Montgomery botanical Center, 11901 Old Cutler Road, Coral Gables, FL, 33156, USA
4 - THE NY BOTANICAL GARDEN, 2900 SOUTHERN BLVD, BRONX, NY, 10458-5126, USA, 718/817-8632

Keywords:
Caribbean
cycad
biogeography
microsatellite DNA
population genetics.

Presentation Type: Symposium or Colloquium Presentation
Session: C5
Location: Franklin A/Hyatt
Date: Wednesday, July 11th, 2012
Time: 9:15 AM
Number: C5004
Abstract ID:105


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