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4 results for “Microtropis”
FIGURE 2. Microtropis cerocarpa. A in Microtropis cerocarpa (Celastraceae), a new species from southern Vietnam
FIGURE 2. Microtropis cerocarpa. A. Branch node with fruiting inflorescences in axils of abscised leaves; the capsule at left is fallen off leaving its calyx. B. Fruiting calyx, top view. C. Fruiting inflorescence with a single capsule developed or left. D. Capsule base with calyx, lateral view. E. Surface of immature capsule; note the wax granules. F. Cross section of immature capsule. Nuraliev 466. All photos by M. Nuraliev.
FIGURE 1. Microtropis cerocarpa. A–C. Mature tree, leafy shoots. D. Young plant. E. Trunk with branches. F in Microtropis cerocarpa (Celastraceae), a new species from southern Vietnam
FIGURE 1. Microtropis cerocarpa. A–C. Mature tree, leafy shoots. D. Young plant. E. Trunk with branches. F. Resting buds (possibly, an inflorescence). G. Branch with leaf scar. Nuraliev 466. All photos by M. Nuraliev.
Refugia during the last glacial period and the origin of the disjunct distribution of the insular plant Microtropis japonica (Celastraceae)
<p><span><b>Aim: </b>While many phylogeographical studies have focused on continental refugia, the function of islands as refugia has been long overlooked. In this study, we examined the biogeographic history of <i>Microtropis japonica </i>and its insular distribution to elucidate the hidden status of islands on the range expansion of plants.</span></p> <p><span><b>Location: </b>Two disjunct island areas of Japan (the Izu and Ryukyu Islands) and their adjacent areas (the Japanese mainlands Honshu and Kyushu, and Taiwan).</span></p> <p><span><b>Taxon: </b><i>Microtropis japonica </i>(Celastraceae).</span></p> <p><span><b>Methods: </b>Phylogeographic and population genetic analyses were performed using chloroplast DNA (cpDNA) and nuclear single-nucleotide polymorphism (SNP) data. In addition, ecological niche modeling of current suitable habitats and those during the last glacial maximum were conducted using occurrence and climate data.</span></p> <p><span><b>Results: </b>Both cpDNA and nuclear SNP data showed genetic differentiation between two disjunct regions (mainly the Izu and Ryukyu Islands). However, at the intra-regional level, the genetic structures revealed by different markers showed different geographic patterns. While cpDNA data indicated genetic differentiation within the Ryukyu Islands but not within the Izu Islands, nuclear SNP data indicated genetic differentiation within both island groups. Ecological niche modeling showed that both the Izu and Ryukyu Islands have continuously been potential distribution areas regardless of historical climate oscillations.</span></p> <p><span><b>Main conclusions: </b>Genetic data suggest that the current disjunct distribution pattern of <i>M. japonica</i> strongly reflects the refugia locations during the last glacial period and the subsequent range expansion. Ecological niche modeling revealed the importance of islands as refugia in the disjunct distribution of <i>M. japonica</i>.</span></p>
Refugia during the last glacial period and the origin of the disjunct distribution of the insular plant Microtropis japonica (Celastraceae)
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