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Title: Patterns of genetic diversity in Phoenix canariensis, a widespread oceanic palm (species) endemic from the Canarian archipelago
Authors: Saro, Isabel 
González Pérez,Miguel Ángel 
García-Verdugo, Carlos
Sosa, Pedro A. 
UNESCO Clasification: 241714 Genética vegetal
Keywords: Arecaceae
Phoenix canariensis
Genetic diversity
Isolation by distance, et al
Issue Date: 2015
Publisher: 1614-2942
Project: Determinacion de la Estructuracion y Flujo Genetico de Las Poblaciones Naturales de la Palmera Canaria y Grado de Introgresion Con Taxones Afines en Canarias, Mediante Marcadores Moleculares 
Journal: Tree Genetics and Genomes 
Abstract: Understanding how genetic diversity is structured on oceanic island taxa requires the integration of physical, biological and anthropomorphic factors. Founder effects coupled with limited dispersal over sea barriers typically result in low levels of genetic variation in island populations. In widespread species, restriction in gene flow across large areas leads to patterns of isolation by distance (IBD), but recent population-based studies indicate that genetic structure on islands can be complex even at local scales. Here, we investigated the patterns of genetic variation in a widespread island palm (Phoenix canariensis) displaying reproductive syndromes associated with extensive dispersal (wind pollination and zoochory). Genetic variation was assessed at eight nuclear microsatellite loci in 330 individuals of 15 Canarian populations. Our results showed that levels of within-population genetic diversity in P. canariensis depend on the island considered, with a strong decreasing pattern from the easternmost and oldest island to the westernmost and youngest islands. A Mantel test supported a stepping-stone model of differentiation across the archipelago that fits the sequence of island emergence, and results from ABC and clustering analyses also corresponded with this progression rule. In addition, our analyses were congruent with the idea that the only large population found on Lanzarote has an anthropogenic origin. Despite the high dispersal potential of P. canariensis, our analyses suggest that the geographical configuration of the Canary Islands and a relatively recent pattern of differentiation across islands appear to have had a primary influence on the genetic structure of this island taxon.
ISSN: 1614-2942
DOI: 10.1007/s11295-014-0815-0
Source: Tree Genetics & Genomes [ISSN 1614-2942], v. 11 (1), 815
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