DeLafontaineDucoussoLefevreEtAl2013

Référence

de Lafontaine, G., Ducousso, A., Lefevre, S., Magnanou, E., Petit, R.J. (2013) Stronger spatial genetic structure in recolonized areas than in refugia in the European beech. Molecular Ecology, 22(17):4397-4412. (Scopus )

Résumé

Extant rear-edge populations located in former glacial refugia remain understudied despite their high conservation value. These populations should have experienced strong genetic drift due to their small size and long isolation. Moreover, the prolonged action of isolation by distance in refugial areas should result in stronger regional spatial genetic structure (SGS) than in recolonized areas, but empirical tests of this prediction are scarce. To fill this gap, we first used a set of 16 microsatellite markers to investigate the genetic structure of European beech in France in 65 populations from three refugial areas and one control recolonized (nonrefugial) area. Then, using the same approach, we reanalysed published isozyme data from 375 populations distributed across the entire species range. We found stronger genetic differentiation among populations in refugia than in recolonized areas. However, contrary to expectations, regional SGS was lower within refugia than within recolonized areas. Published studies presenting similar analyses suggest that our results could have generality across different biogeographical settings and types of organisms. Strong and prolonged genetic drift in refugial areas could have erased the signature of range expansions that is still visible in recolonized areas. Our results therefore suggest that Pleistocene population isolation has played a key role in increasing the genetic complexity of extant rear-edge populations. © 2013 John Wiley & Sons Ltd.

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@ARTICLE { DeLafontaineDucoussoLefevreEtAl2013,
    AUTHOR = { de Lafontaine, G. and Ducousso, A. and Lefevre, S. and Magnanou, E. and Petit, R.J. },
    TITLE = { Stronger spatial genetic structure in recolonized areas than in refugia in the European beech },
    JOURNAL = { Molecular Ecology },
    YEAR = { 2013 },
    VOLUME = { 22 },
    NUMBER = { 17 },
    PAGES = { 4397-4412 },
    NOTE = { cited By 35 },
    ABSTRACT = { Extant rear-edge populations located in former glacial refugia remain understudied despite their high conservation value. These populations should have experienced strong genetic drift due to their small size and long isolation. Moreover, the prolonged action of isolation by distance in refugial areas should result in stronger regional spatial genetic structure (SGS) than in recolonized areas, but empirical tests of this prediction are scarce. To fill this gap, we first used a set of 16 microsatellite markers to investigate the genetic structure of European beech in France in 65 populations from three refugial areas and one control recolonized (nonrefugial) area. Then, using the same approach, we reanalysed published isozyme data from 375 populations distributed across the entire species range. We found stronger genetic differentiation among populations in refugia than in recolonized areas. However, contrary to expectations, regional SGS was lower within refugia than within recolonized areas. Published studies presenting similar analyses suggest that our results could have generality across different biogeographical settings and types of organisms. Strong and prolonged genetic drift in refugial areas could have erased the signature of range expansions that is still visible in recolonized areas. Our results therefore suggest that Pleistocene population isolation has played a key role in increasing the genetic complexity of extant rear-edge populations. © 2013 John Wiley & Sons Ltd. },
    AFFILIATION = { Guillaume de Lafontaine, IBIS, Université Laval, QC, Canada; Univ. Bordeaux 1, UMR 1202 BIOGECO, F-33400 Talence, France; Laboratoire ARAGO, Université Pierre et Marie Curie-Paris, 6, Avenue Fontaulé, 66650 Banyuls-sur-Mer, France; Biologie Intégrative des Organismes Marins, UMR7232, CNRS, Avenue Fontaulé, 66650 Banyuls-sur-Mer, France },
    AUTHOR_KEYWORDS = { Europe; Fagus sylvatica; genetic differentiation; glacial refugia; isolation-by-distance; range expansion; rear edge; spatial genetic structure },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1111/mec.12403 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883252785&doi=10.1111%2fmec.12403&partnerID=40&md5=9dce051f1267fa2ca323710bb4b2a7ef },
}

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