000165637 001__ 165637 000165637 005__ 20260113234334.0 000165637 0247_ $$2doi$$a10.1111/j.1365-2699.2011.02658.x 000165637 0248_ $$2sideral$$a77382 000165637 037__ $$aART-2012-77382 000165637 041__ $$aeng 000165637 100__ $$0(orcid)0000-0001-5658-8411$$aViruel, J.$$uUniversidad de Zaragoza 000165637 245__ $$aDisrupted phylogeographical microsatellite and chloroplast DNA patterns indicate a vicariance rather than long-distance dispersal origin for the disjunct distribution of the Chilean endemic Dioscorea biloba (Dioscoreaceae) around the Atacama Desert 000165637 260__ $$c2012 000165637 5203_ $$aAim The Chilean endemic Dioscorea biloba (Dioscoreaceae) is a dioecious geophyte that shows a remarkable 600 km north–south disjunction in the peripheral arid area of the Atacama Desert. Its restricted present-day distribution and probable Neogene origin indicate that its populations have a history linked to that of the Atacama Desert, making this an ideal model species with which to investigate the biogeography of the region. Location Chile, Atacama Desert and peripheral arid area. Methods Two hundred and seventy-five individuals from nine populations were genotyped for seven nuclear microsatellite loci, and plastid trnL–F and trnT–L sequences were obtained for a representative subset of these. Analyses included the estimation of genetic diversity and population structure through clustering, Bayesian and analysis of molecular variance analyses, and statistical parsimony networks of chloroplast haplotypes. Isolation by distance was tested against alternative dispersal hypotheses. Results Microsatellite markers revealed moderate to high levels of genetic diversity within populations, with those from the southern Limarí Valley showing the highest values and northern populations showing less exclusive alleles. Bayesian analysis of microsatellite data identified three genetic groups that corresponded to geographical ranges. Chloroplast phylogeography revealed no haplotypes shared between northern and southern ranges, and little haplotype sharing between the two neighbouring southern valleys. Dispersal models suggested the presence of extinct hypothetical populations between the southern and northern ranges. Main conclusions Our results are consistent with prolonged isolation of the northern and southern groups, mediated by the life-history traits of the species. Significant isolation was revealed at both large and moderate distances as gene flow was not evident even between neighbouring valleys. Bayesian analyses of microsatellite and chloroplast haplotype diversity identified the southern area of Limarí as the probable area of origin of the species. Our data do not support recent dispersal of D. biloba from the southern range into Antofagasta, but indicate the fragmentation of an earlier wider range, concomitant with the Pliocene–Pleistocene climatic oscillations, with subsequent extinctions of the Atacama Desert populations and the divergence of the peripheral ones as a consequence of genetic drift. 000165637 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000165637 590__ $$a4.863$$b2012 000165637 591__ $$aGEOGRAPHY, PHYSICAL$$b2 / 45 = 0.044$$c2012$$dQ1$$eT1 000165637 591__ $$aECOLOGY$$b18 / 135 = 0.133$$c2012$$dQ1$$eT1 000165637 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000165637 700__ $$0(orcid)0000-0001-7793-5259$$aCatalán, P.$$uUniversidad de Zaragoza 000165637 700__ $$0(orcid)0000-0003-0061-8647$$aSegarra-Moragues, J. 000165637 7102_ $$15011$$2X$$aUniversidad de Zaragoza$$bDpto. CC.Agrar.y Medio Natural$$cProy. investigación JFA 000165637 7102_ $$15011$$2063$$aUniversidad de Zaragoza$$bDpto. CC.Agrar.y Medio Natural$$cÁrea Botánica 000165637 773__ $$g39, 6 (2012), 1073-1085$$pJ. biogeogr.$$tJOURNAL OF BIOGEOGRAPHY$$x0305-0270 000165637 8564_ $$s438510$$uhttps://zaguan.unizar.es/record/165637/files/texto_completo.pdf$$yVersión publicada 000165637 8564_ $$s2350864$$uhttps://zaguan.unizar.es/record/165637/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000165637 909CO $$ooai:zaguan.unizar.es:165637$$particulos$$pdriver 000165637 951__ $$a2026-01-13-22:04:41 000165637 980__ $$aARTICLE