caa a22 4500 445821264 CHVBK 20180317145244.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00239-011-9434-7 doi (NATIONALLICENCE)springer-10.1007/s00239-011-9434-7 The Influence of Historical Geneflow, Bathymetry and Distribution Patterns on the Population Genetics of Morphologically Diverse Galápagos' Opuntia echios [Elektronische Daten] [P. Helsen, P. Verdyck, S. Van Dongen] Throughout history, remote archipelagos have repeatedly been designated natural laboratories to study evolutionary processes. The extensive, geographically structured, morphological variation within Galápagos' Opuntia cacti has been presumed to be another example of how such processes shape diversity. However, recent genetic studies on speciation and potential effects of plasticity within this system failed to confirm earlier classification and hypothesized radiation on both global and single island levels. Detailed population genetic information, however, is crucial in conserving these semi-arid ecosystem keystone species. In this article, we re-evaluate the genetics of Opuntia echios inhabiting one of the most taxon rich places on the archipelago: Santa Cruz and its surrounding satellite islands, using microsatellite data. Our analysis revealed high genetic variability within all sampled locations, providing little support for the hypothesis of clonal reproduction. Inter-island gene flow patterns appear to be largely influenced by bathymetry and sea levels during last ice ages. Although O. echios from Seymour Norte are morphologically recognized as being a separate taxon, Daphné Major's cacti are the most differentiated. In addition, we found a potential barrier for gene flow along the ring-like distribution of Opuntias at the western side of Santa Cruz, suggesting potential links with geology. Springer Science+Business Media, LLC, 2011 Population genetics nationallicence Opuntia nationallicence Geology nationallicence Galapagos nationallicence Gene flow nationallicence Bathymetry nationallicence Polyploidy nationallicence Helsen P. Evolutionary Ecology Group, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut Verdyck P. Evolutionary Ecology Group, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut Van Dongen S. Evolutionary Ecology Group, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut Journal of Molecular Evolution Springer-Verlag 72/3(2011-03-01), 315-325 0022-2844 72:3<315 2011 72 239 https://doi.org/10.1007/s00239-011-9434-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00239-011-9434-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Helsen P. Evolutionary Ecology Group, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut NATIONALLICENCE 700 1- Verdyck P. Evolutionary Ecology Group, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut NATIONALLICENCE 700 1- Van Dongen S. Evolutionary Ecology Group, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium aut NATIONALLICENCE 773 0- Journal of Molecular Evolution Springer-Verlag 72/3(2011-03-01), 315-325 0022-2844 72:3<315 2011 72 239 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer