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Henrik Balslev

Genetic structuring in a Neotropical palm analyzed through an Andean orogenesis-scenario

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DOI

  • Sebastian Escobar
  • Jean-Christophe Pintaud, Inst Rech Dev, Institut de Recherche pour le Developpement (IRD), Universite Bretagne Loire (ComUE), DYNADIV, UMR DIADE
  • ,
  • Henrik Balslev
  • Rodrigo Bernal, Univ Nacl Colombia, Universidad Nacional de Colombia, Inst Ciencias Nat
  • ,
  • Monica Moraes Ramirez, Univ Mayor San Andres, Universidad Mayor de San Andres, Inst Ecol
  • ,
  • Betty Millan, Univ Nacl Mayor San Marcos UNMSM, Universidad Nacional Mayor de San Marcos, Museo Hist Nat
  • ,
  • Rommel Montufar, Pontificia Univ Catolica Ecuador, Pontificia Universidad Catolica del Ecuador, Fac Ciencias Exactas & Nat

Andean orogenesis has driven the development of very high plant diversity in the Neotropics through its impact on landscape evolution and climate. The analysis of the intraspecific patterns of genetic structure in plants would permit inferring the effects of Andean uplift on the evolution and diversification of Neotropical flora. In this study, using microsatellite markers and Bayesian clustering analyses, we report the presence of four genetic clusters for the palm Oenocarpus bataua var. bataua which are located within four biogeographic regions in northwestern South America: (a) Choco rain forest, (b) Amotape-Huancabamba Zone, (c) northwestern Amazonian rain forest, and (d) southwestern Amazonian rain forest. We hypothesize that these clusters developed following three genetic diversification events mainly promoted by Andean orogenic events. Additionally, the distinct current climate dynamics among northwestern and southwestern Amazonia may maintain the genetic diversification detected in the western Amazon basin. Genetic exchange was identified between the clusters, including across the Andes region, discarding the possibility of any cluster to diversify as a distinct intraspecific variety. We identified a hot spot of genetic diversity in the northern Peruvian Amazon around the locality of Iquitos. We also detected a decrease in diversity with distance from this area in westward and southward direction within the Amazon basin and the eastern Andean foothills. Additionally, we confirmed the existence and divergence of O.bataua var. bataua from var. oligocarpus in northern South America, possibly expanding the distributional range of the latter variety beyond eastern Venezuela, to the central and eastern Andean cordilleras of Colombia. Based on our results, we suggest that Andean orogenesis is the main driver of genetic structuring and diversification in O.bataua within northwestern South America.

Original languageEnglish
JournalEcology and Evolution
Volume8
Issue16
Pages (from-to)8030-8042
Number of pages13
ISSN2045-7758
DOIs
Publication statusPublished - Aug 2018

    Research areas

  • genetic divergence, genetic diversity, microsatellite markers, Oenocarpus, phylogeography, AMOTAPE-HUANCABAMBA ZONE, MULTILOCUS GENOTYPE DATA, RAIN-FOREST TREE, POPULATION-STRUCTURE, SPECIES-RICHNESS, MICROSATELLITE MARKERS, LANDSCAPE GENETICS, AMAZONIAN FORESTS, MART. ARECACEAE, EUTERPE-EDULIS

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