@article{fdi:010078950,
  title = {{P}opulation genomics of the widespread {A}frican savannah trees {A}fzelia africana and {A}fzelia quanzensis reveals no significant past fragmentation of their distribution ranges},
  author = {{D}onkpegan, {A}. {S}. {L}. and {P}iñeiro, {R}. and {H}euertz, {M}. and {D}uminil, {J}{\'e}r{\^o}me and {D}a{\¨ie}nou, {K}. and {D}oucet, {J}. {L}. and {H}ardy, {O}. {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}remise {F}ew studies have addressed the evolutionary history of tree species from {A}frican savannahs. {A}fzelia contains economically important timber species, including two species widely distributed in {A}frican savannahs: {A}. africana in the {S}udanian region and {A}. quanzensis in the {Z}ambezian region. {W}e aimed to infer whether these species underwent range fragmentation and/or demographic changes, possibly reflecting how savannahs responded to {Q}uaternary climate changes. {M}ethods {W}e characterized the genetic diversity and structure of these species across their distribution ranges using nuclear microsatellites ({SSR}s) and genotyping-by-sequencing ({GBS}) markers. {S}ix {SSR} loci were genotyped in 241 {A}. africana and 113 {A}. quanzensis individuals, while 2800 high-quality single nucleotide polymorphisms ({SNP}s) were identified in 30 {A}. africana individuals. {R}esults {B}oth species appeared to be mainly outcrossing. {T}he kinship between individuals decayed with the logarithm of the distance at similar rates across species and markers, leading to relatively small {S}p statistics (0.0056 for {SSR} and 0.0054 for {SNP} in {A}. africana, 0.0075 for {SSR} in {A}. quanzensis). {T}he patterns were consistent with isolation by distance expectations in the absence of large-scale geographic gradients. {B}ayesian clustering of {SSR} genotypes did not detect genetic clusters within species. {I}n contrast, {SNP} data resolved intraspecific genetic clusters in {A}. africana, illustrating the higher resolving power of {GBS}. {H}owever, these clusters revealed low levels of differentiation and no clear geographical entities, so that they were interpreted as resulting from the isolation by distance pattern rather than from past population fragmentation. {C}onclusions {T}hese results suggest that populations have remained connected throughout the large, continuous savannah landscapes. {T}he absence of clear phylogeographic discontinuities, also found in a few other {A}frican savannah trees, indicates that their distribution ranges have not been significantly fragmented during the climatic oscillations of the {P}leistocene, in contrast to patterns commonly found in {A}frican rainforest trees.},
  keywords = {{A}fzelia ; {F}abaceae - {D}etarioideae ; demographic expansion ; isolation by distance ; kinship ; savannah trees ; {SNP}s ; spatial genetic structure ; {SSR}s ; {AFRIQUE} {SUBSAHARIENNE}},
  booktitle = {},
  journal = {{A}merican {J}ournal of {B}otany},
  volume = {107},
  numero = {3},
  pages = {498--509},
  ISSN = {0002-9122},
  year = {2020},
  DOI = {10.1002/ajb2.1449},
  URL = {https://www.documentation.ird.fr/hor/fdi:010078950},
}