The influence of historical geneflow, bathymetry and distribution patterns on the population genetics of morphologically diverse Galápagos' Opuntia echios.

摘要: Throughout history, remote archipelagos have repeatedly been designated natural laboratories to study evolutionary processes. The extensive, geographically structured, morphological variation within Galapagos’ Opuntia cacti has presumed be another example of how such processes shape diversity. However, recent genetic studies on speciation and potential effects plasticity this system failed confirm earlier classification hypothesized radiation both global single island levels. Detailed population information, however, is crucial in conserving these semi-arid ecosystem keystone species. In article, we re-evaluate the genetics echios inhabiting one most taxon rich places archipelago: Santa Cruz its surrounding satellite islands, using microsatellite data. Our analysis revealed high variability all sampled locations, providing little support for hypothesis clonal reproduction. Inter-island gene flow patterns appear largely influenced by bathymetry sea levels during last ice ages. Although O. from Seymour Norte are morphologically recognized as being a separate taxon, Daphne Major’s differentiated. addition, found barrier along ring-like distribution Opuntias at western side Cruz, suggesting links with geology.