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Zamia (Cycadales: Zamiaceae) on Puerto Rico: Asymmetric genetic differentiation and the hypothesis of multiple introductions

Meerow, Alan W. ; Francisco‐Ortega, Javier ; Calonje, Michael ; Griffith, M. Patrick ; Ayala‐Silva, Tomás ; Stevenson, Dennis W. ; Nakamura, Kyoko

American Journal of Botany, November 2012, Vol.99(11), pp.1828-1839 [Periódico revisado por pares]

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  • Título:
    Zamia (Cycadales: Zamiaceae) on Puerto Rico: Asymmetric genetic differentiation and the hypothesis of multiple introductions
  • Autor: Meerow, Alan W. ; Francisco‐Ortega, Javier ; Calonje, Michael ; Griffith, M. Patrick ; Ayala‐Silva, Tomás ; Stevenson, Dennis W. ; Nakamura, Kyoko
  • Assuntos: Caribbean Biogeography ; Coalescence ; Cycads ; Microsatellite Dna ; Population Genetics
  • É parte de: American Journal of Botany, November 2012, Vol.99(11), pp.1828-1839
  • Descrição: • This study of in Puerto Rico is the most intensive population genetics investigation of a cycad to date in terms of number of markers, and one of few microsatellite DNA studies of plants from the highly critical Caribbean biodiversity hotspot. Three distinctive taxa occur on the island: on the north coast, and and , both in the south. Their relationships are largely unknown. We tested three hypotheses about their genetic diversity, including the possibility of multiple introductions. • We used 31 microsatellite loci across 10 populations and analyzed the data with AMOVA, Bayesian clustering, and ABC coalescent modeling. • Puerto Rican zamias exhibit an amalgam of patterns of genetic differentiation that have been reported for cycads. Overall, the taxa are slightly inbred, with high infra‐populational variation and little evidence of recent bottlenecks. exhibits a more than threefold greater degree of population differentiation than the other two taxa. Admixture is evident only between and . is inferred to be the youngest taxon on the island, on the basis of estimates of coalescence time and effective population size. A selective sweep may be underway in a small population of in a saline environment. • may represent an independent introduction into Puerto Rico; and fit a scenario of allopatric speciation. This will be explored further in the context of genetic analysis across the entire Caribbean region.

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