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6 results for “Stenanona”
Data from: A jungle tale: molecular phylogeny and divergence time estimates of the Desmopsis - Stenanona clade (Annonaceae) in Mesoamerica
The predominantly Asian tribe Miliuseae (Annonaceae) includes over 37 Neotropical species that are mainly distributed across Mesoamerica, from southern Mexico to northern Colombia. The tremendous ecological and morphological diversity of this clade, including ramiflory, cauliflory, flagelliflory, and clonality, suggests adaptive radiation. Despite the spectacular phenotypic divergence of this clade, little is known about its phylogenetic and evolutionary history. In this study we used a nuclear DNA marker and seven chloroplast markers, and maximum parsimony, maximum likelihood and Bayesian inference methods to reconstruct a comprehensive time-calibrated phylogeny of tribe Miliuseae, especially focusing on the Desmopsis-Stenanona clade. We also perform ancestral area reconstructions to infer the biogeographic history of this group. Finally, we use ecological niche modeling, lineage distribution models, and niche overlap tests to assess whether geographic isolation and ecological specialization influenced the diversification of lineages within this clade. We reconstructed a monophyletic Miliuseae that is divided into two strongly supported clades: (i) a Sapranthus-Tridimeris clade and (ii) a Desmopsis-Stenanona clade. The colonization of the Neotropics and subsequent diversification of Neotropical Miliuseae seems to have been associated with the expansion of the boreotropical forests during the late Eocene and their subsequent fragmentation and southern displacement. Further speciation within Neotropical Miliuseae out of the Maya block seems to have occurred during the last 15 million years. Lastly, the geographic structuring of major lineages of the Desmopsis-Stenanona clade seems to have followed a climatic gradient, supporting the hypothesis that morphological differentiation between closely related species resulted from both long-term isolation between geographic ranges and adaptation to environmental conditions.
FIGURE 2 in Living on the rocks: a new species of Stenanona (Annonaceae) from karst limestone forests of southern Mexico
FIGURE 2. Phylogenetic relationships and morphological differentiation of Stenanona zoque. A. From top to bottom, flowers of Stenanona migueliana, Stenanona stenopetala and Stenanona zoque. B. The Bayesian tree based analysis of seven plastid regions (psbA-trnH, trnL-F, rps16-trnQ introns/spacers and matK, ndhF, rbcL and ycf1 exons) and nuclear ribosomal ITS (modified from Ortiz-Rodriguez et al. 2018). In the phylogenetic tree Stenanona zoque (in red) is placed in subclade A of the Desmopsis-Stenanona clade.
FIGURE 1. Stenanona zoque. A. Habit. B. Abaxial leaf surface. C in Living on the rocks: a new species of Stenanona (Annonaceae) from karst limestone forests of southern Mexico
FIGURE 1. Stenanona zoque. A. Habit. B. Abaxial leaf surface. C. Longitudinal section of flower showing carpels and stamens. D. Inflorescence (rhipidium) with elongate, branched peduncle (sympodial rachis) with several simultaneous long-pedicellate flowers. E. Inflorescence (rhipidium) with a short peduncle and one long-pedicellate mature flower and one floral bud. Drawn by Christian Valencia Celiz from the type.
FIGURE 3 in Living on the rocks: a new species of Stenanona (Annonaceae) from karst limestone forests of southern Mexico
FIGURE 3. Distribution of Stenanona zoque (yellow dots), Stenanona migueliana (green triangles) and Stenanona stenopetala (blue squares) based on georeferenced localities available at the Global Biodiversity Information Facility.
Data from: A jungle tale: molecular phylogeny and divergence time estimates of the Desmopsis - Stenanona clade (Annonaceae) in Mesoamerica
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Data from: Phylogenetic relationships among members of the neotropical clade of Miliuseae (Annonaceae): generic non-monophyly of Desmopsis and Stenanona
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