Dry season characteristics in western Amazonia underlie the divergence of Astrocaryum section Huicungo (Arecaceae) and evaluation of potential anatomical adaptations
- Jimenez-Vasquez, Victor
- Millán, Betty
- Machahua, Miguel
- Kahn, Francis
- Ramirez, Rina
- Pintaud, Jean-Christophe
- Roncal, Julissa
DOIAbstract
International audiencePopulation and species divergence in South America are usually attributed to geographical barriers in the form of rivers, mountains or climate. In western Amazonia (<1000 m elevation) case studies addressing the ecological niche as a divergent selection agent are scarce. Using sequences from five plastid and six low-copy nuclear DNA regions, we reconstructed coalescent species phylogenetic trees for Astrocaryum section Huicungo (15 species, Arecaceae), which corroborated the presence of two lineages distributed north and south of 5°S in western Amazonia. Using elevation, three climatic and six soil variables we evaluated the ecological niche of each lineage. Different annual precipita-tion regimes were associated with ...
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