@ARTICLE{TreeBASE2Ref27425, author = {Victor Alberto Jimenez-Vasquez and Betty Millan and Miguel Machahua and Francis Kahn and Rina Ramirez and Jean-Christophe Pintaud and Julissa Roncal}, title = {Dry season characteristics in western Amazonia underlie the divergence of Astrocaryum section Huicungo (Arecaceae) and evaluation of potential anatomical adaptations}, year = {2017}, keywords = {anatomy ? coalescent species tree ? driest month - ecological speciation - morphology ? Neotropics - precipitation seasonality ? species distribution modeling}, doi = {10.1093/botlinnean/box060}, url = {http://}, pmid = {}, journal = {Botanical Journal of the Linnean Society}, volume = {185}, number = {3}, pages = {291?306}, abstract = {Population and species divergence in South America are usually attributed to geographic barriers in the form of rivers, mountains or climate. In Western Amazonia (<1000 m of 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 seven climatic, elevation, and eight soil variables we evaluated the ecological niche of each lineage. A north to south precipitation gradient was associated with each lineage. Notably, a higher driest month precipitation, lower seasonality, and lower elevation were attributed to the northern clade, while the opposite was found for the southern clade. We also explored the diagnostic and evolutionary importance of 35 anatomical and 31 morphological characters using a phylogenetic analysis and ancestral character reconstructions. None of the anatomical characters were diagnostic for either lineage. However, hypodermal cell wall width and the location of aerenchyma had different ancestral states for the two lineages, and their adaptive values to the precipitation regime differences are discussed} }

• Go to search
• Citation
• Taxa
• Matrices
• Trees
• Analyses
• 

CiteULike

Delicious

Connotea