RT Journal Article
T1 Phylogeographic reconstructions can be biased by ancestral shared alleles: The case of the polymorphic lichen Bryoria fuscescens in Europe and North Africa
A1 Boluda, Carlos
A1 Jiménez Rico, Víctor
A1 Naciri, Yamama
A1 Hawksworth, David L.
A1 Scheidegger, Christoph
AB Large phylogeographic studies on lichens are scarce, and none involves a single spe-cies  within  which  different  lineages  show  fixed  alternative  dispersal  strategies.  We  investigated Bryoria  fuscescens  (including  B. capillaris)  in  Europe  and  western  North  Africa  by  phenotypically  characterizing  1400 specimens  from  64  populations  and genotyping them with 14 microsatellites. We studied population structure and genetic diversity at the local and continental scales, discussed the post- glacial phylogeogra-phy, and compared dispersal capacities of phenotypes with and without soralia. Our main hypothesis is that the estimated phylogeography, migration routes, and dispersal capacities  may  be  strongly  biased  by  ancestral  shared  alleles.  Scandinavia  is  geneti-cally the richest area, followed by the Iberian Peninsula, the Carpathians, and the Alps. Three  gene  pools  were  detected:  two  partially  linked  to  phenotypic  characteristics,  and the third one genetically related to the American sister species B. pseudofusces-cens. The comparison of one gene pool producing soredia and one not, suggested both as  panmictic,  with  similar  levels  of  isolation  by  distance  (IBD).  The  migration  routes  were estimated to span from north to south, in disagreement with the assessed glacial refugia. The presence of ancestral shared alleles in distant populations can explain the similar IBD levels found in both gene pools while producing a false signal of panmixia, and  also  biasing  the  phylogeographic  reconstruction.  The  incomplete  lineage  sort-ing recorded for DNA sequence loci also supports this hypothesis. Consequently, the high diversity in Scandinavia may rather come from recent immigration into northern populations than from an in situ diversification. Similar patterns of ancestral shared polymorphism may bias the phylogeographical reconstruction of other lichen species.
PB John Wiley & Sons
YR 2021
FD 2021
LK https://hdl.handle.net/20.500.14352/88920
UL https://hdl.handle.net/20.500.14352/88920
LA eng
NO Boluda CG, Rico VJ, Naciri Y, Hawksworth DL, Scheidegger C. Phylogeographic reconstructions can be biased by ancestral shared alleles: The case of the polymorphic lichen Bryoria fuscescens in Europe and North Africa. Molecular Ecology 2021;30:4845–65. https://doi.org/10.1111/mec.16078.
NO Ministerio de Economía y Competitividad (España)
NO Federal Office for the Environment (Switzerland)
NO SwissBOL
DS Docta Complutense
RD 8 abr 2025