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912 results for “Aster”
Cryptic diversity on cliffs: Aster sanqingensis, a new species of Asteraceae from Eastern China
<p>It is generally believed that cliffs bear low biodiversity because of its harsh habitats. However, another reason, i.e. insufficient investigation caused by the inaccessibility of the cliffs, could not be excluded. In the genus Aster, two cliff species, <em>Aster fanjingshanicus</em> and <em>Aster tianmenshanensis</em>, respectively growing on the slate and limestone cliffs, were established. During our extensive field investigations, the third cliff species of Aster growing on granite cliffs from Eastern China was found. Based on the evidence from molecular phylogeny, morphology, and micro-morphology, we proposed that it should be treated as a new species and named <em>Aster sanqingensis.</em> It is described and illustrated here. Considering its limited number of individuals, highly localized distribution, and disturbed habitat, we proposed to treat it as a critically endangered species. Our new finding indicates there is cryptic biodiversity on the cliffs remaining to be discovered.</p>
SPOT5 (2007), ASTER (2016) and SPOT7 (2018) Digital Elevation Models of Little Kluane Glacier (Yukon Territory)
<p>===========================</p> <p>Authors</p> <p>Etienne BERTHIER</p> <p>LEGOS, Université de Toulouse, CNES, CNRS, IRD, UPS, 31400 Toulouse, France,</p> <p>===========================<br> 1. Collection</p> <p>This collection contains three digital elevation models (DEMs) of "Little Kluane" Glacier (Yukon Territory, Canada) with an horizontal grid spacing of 30 m<br> * SPOT5, 13 September 2007<br> * ASTER, 30 September 2017<br> * SPOT7, 1 October 2018</p> <p>The original SPOT5 DEM was obtained from the SPIRIT project (Korona et al., 2009)<br> ASTER and SPOT7 DEMs have been derived using the Ames Stereo Pipeline (Beyer et al., 2018) from stereo images using the set of correlation of parameters in Deschamps-Berger et al. (2020)</p> <p>All DEMs have been coregistered and bias-corrected to the Copernicus 30 m global DEM following the methods of Berthier & Brun (2019)</p> <p><br> ===========================</p> <p>2. Dataset Acknowledgement</p> <p>* SPOT5 data were obtained thanks to funding from CNES during the fourth international polar year.<br> * SPOT7 data were obtained thanks to DINAMIS Project, for “Dispositif Institutionnel National d’Approvisionnement Mutualisé en Imagerie Satellitaire”, a French platform that acquires and distributes very high resolution Earth satellite imagery for French and foreign institutional users under specific subscription conditions.<br> * ASTER data were provided by NASA (U.S.) and METI (Japan).</p> <p>===========================</p> <p>3. Dataset Attribution</p> <p>This dataset is licensed under a Creative Commons CC BY-NC 4.0 International License (Attribution-NonCommercial).</p> <p><br> ===========================</p> <p>4. Related publication</p> <p>This dataset has been generated for and used in a publication to be submitted to the Journal of Glaciology :<br> Morin, A., Flowers, G. E., Nolan, A., Brinkerhoff, D. J., and Berthier, E.: Exploiting high-slip ?ow regimes to improve bed inference, submitted.<br> </p> <p>===========================</p> <p>5. Collection Location</p> <p>Yukon Territory of Canada<br> Bounding box: WGS 84 / UTM zone 7N</p> <p><north>6771585.730</north><br> <south>6739845.730</south><br> <east>564391.250</east><br> <west>601261.250</west></p> <p><br> ===========================</p> <p>References</p> <p>Berthier, E. and Brun, F.: Karakoram geodetic glacier mass balances between 2008 and 2016: persistence of the anomaly and influence of a large rock avalanche on Siachen Glacier, J Glaciol, 65, 494–507, https://doi.org/10.1017/jog.2019.32, 2019.<br> Beyer, R. A., Alexandrov, O., and McMichael, S.: The Ames Stereo Pipeline: NASA’s Open Source Software for Deriving and Processing Terrain Data, Earth and Space Science, 5, 537–548, https://doi.org/10.1029/2018EA000409, 2018.<br> Deschamps-Berger, C., Gascoin, S., Berthier, E., Deems, J., Gutmann, E., Dehecq, A., Shean, D., and Dumont, M.: Snow depth mapping from stereo satellite imagery in mountainous terrain: evaluation using airborne laser-scanning data, The Cryosphere, 14, 2925–2940, https://doi.org/10.5194/tc-14-2925-2020, 2020.<br> Korona, J., Berthier, E., Bernard, M., Remy, F., and Thouvenot, E.: SPIRIT. SPOT 5 stereoscopic survey of Polar Ice: Reference Images and Topographies during the fourth International Polar Year (2007-2009), ISPRS J. Photogramm., 64, 204–212, https://doi.org/10.1016/j.isprsjprs.2008.10.005, 2009.</p> <p> </p>
Satellite Images from ASTER TIR and Landsat 9 (RGB+TIR) for evaluation of unmixing methodologies
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FIGURE 3. Discorhabdella pseudaster n in When is an aster not an aster? A new deep-sea Discorhabdella (Demospongiae, Poecilosclerida) with asters, from the Mozambique Channel
FIGURE 3. Discorhabdella pseudaster n. sp. A, head of a subtylostyle, showing the axial canal. B, head of a pseudoastrose acanthotyle viewed by the top.
FIGURE 2. Discorhabdella pseudaster n in When is an aster not an aster? A new deep-sea Discorhabdella (Demospongiae, Poecilosclerida) with asters, from the Mozambique Channel
FIGURE 2. Discorhabdella pseudaster n. sp., A, habitus of holotype (arrow). B, large subtylostyle. C, tylostyle. D, pseudoastrose acanthotyle. E, immature pseudoastrose acanthotyle. F, pseudoastrose acanthotyle seen from the tip. G, H & I, pseudoasters. J, unguiferous cleistochelae.
FIGURE 5 in Aster oliganthus (Asteraceae, Astereae), a new species from western Sichuan, China, based on morphological and molecular data
FIGURE 5. Aster oliganthus (from the holotype). A, Habit; B, Apex of a middle cauline leaf; C. A ray floret; D. A disc floret; E–I. Phyllarie (outer surface) in 5 series from the outermost to the inmost; J. Opened synantherous stamens (inside surface) of a disc floret; K. Stigma branches and style of a disc floret. Drawn by Gen-Shen Yin.
FIGURE 4 in Aster oliganthus (Asteraceae, Astereae), a new species from western Sichuan, China, based on morphological and molecular data
FIGURE 4. Phylogenetic relationships among Aster oliganthus and other sampled Aster species based on nrDNA ITS-ETS sequence data. Bootstrap support values (1,000 replicates) for maximum parsimony (MP≥50 %, right) and Bayesian posterior probabilities (PP≥0.90, left) are provided above the branches. The tree is rooted to Callistephus chinensis and Myriactis nepalensis.
FIGURE 3 in Aster oliganthus (Asteraceae, Astereae), a new species from western Sichuan, China, based on morphological and molecular data
FIGURE 3. Micrographs of somatic metaphase chromosomes (A) and the karyotype (B) of Aster oliganthus (Scale bar = 10 μm).
FIGURE 2. Aster oliganthus. A in Aster oliganthus (Asteraceae, Astereae), a new species from western Sichuan, China, based on morphological and molecular data
FIGURE 2. Aster oliganthus. A. Synflorescence (Mt. Erlangshan, Sichuan, China); B. Stigma branches and style (left) and the inside of opened synantherous stamens (right) of a disk floret; C. Disk floret (left) and ray floret (right); D. Habit (Mt. Erlangshan, Sichuan, China); E. A plant with falcate cauline leaves and long rhizomes.
FIGURES 2–8. Figs. 2–3. Actinoptychus aster. Fig. 2 in Diatoms (Bacillariophyta) From Artificial Substrates And Sediments In The Caribbean Sea Off Yucatan, Mexico
FIGURES 2–8. Figs. 2–3. Actinoptychus aster. Fig. 2. SEM view of external valve face. Fig. 3. LM in valve view. The arrows indicate the external tube of labiate process. Figs. 4–5. A. senarius. Fig. 4. SEM view of internal valve face. Fig. 5. LM in valve view. The arrows indicate the external tube of labiate process. Fig. 6. Podosira stelligera. Fig. 7. Ehrenbergiulva granulosa. Fig. 8. Hyalodiscus laevis. Scale bar = 10 μm.
FIGURE 6 in Aster brevicaulis (Asteraceae, Astereae), a new species from western Sichuan, China
FIGURE 6. The phylogram of the maximum likelihood (ML) tree from the combined data (ITS and ETS), showing the phylogenetic position of Aster brevicaulis. Values above the branches represent bootstrap values (LP) for maximum likelihood and Bayesian posterior probabilities (PP), respectively; The dash (–) indicates LP <50% or PP <0.90. The new species is indicated by shading. The redefined genus Aster in Eurasia is represented by the core Aster clade and follows Li et al. (2012).
FIGURE 5 in Aster brevicaulis (Asteraceae, Astereae), a new species from western Sichuan, China
FIGURE 5. Micrographs of somatic metaphase chromosomes (A) and the karyotype (B) of Aster brevicaulis.
FIGURE 3 in Aster brevicaulis (Asteraceae, Astereae), a new species from western Sichuan, China
FIGURE 3. Images of living plants of Aster brevicaulis. A: Basal leaves; B: Cauline leaves; C: Longitudinal section of a capitulum; D: A disk floret (left) and a ray floret (right); E: Style branches of a disk floret; F: Phyllaries from the innermost layer (left) to the outmost (right); G: Fruit (mature); H: Fruits.
FIGURE 1 in Aster brevicaulis (Asteraceae, Astereae), a new species from western Sichuan, China
FIGURE 1. Distribution of Aster brevicaulis. The left solid circle indicates Mt. Gaoers and the right Mt. Zheduo.
FIGURE 2 in Aster brevicaulis (Asteraceae, Astereae), a new species from western Sichuan, China
FIGURE 2. Images of living plants of Aster brevicaulis. A: Habit; B: Individuals; C: Dorsal view of a capitulum; D: Involucre, showing the adaxial pilose; E: Top view of the capitulum.
FIGURE 5. Aster huangpingensis W. P. Li & Z. Li. A in Aster huangpingensis (Asteraceae, Astereae), a new species from Guizhou, China
FIGURE 5. Aster huangpingensis W. P. Li & Z. Li. A. Caespitose plants; B. Young clonal ramet with only basal leaves; C. Singlestem plant; D. Capitula in a corymbose cyme; E. Capitulum (lateral view); F. Style branches with apical equilaterally triangle-shaped appendage in a disk floret; G. Middle phyllary; H. Capitulum (top view); I. Abaxial surface of phyllaries from outer series (left) to inner series (right); J. Ray floret (left) and disc floret (right).
FIGURE 6. Aster dolichophyllus. A in Aster huangpingensis (Asteraceae, Astereae), a new species from Guizhou, China
FIGURE 6. Aster dolichophyllus. A. Microhabitat; B. Young clonal ramet with only basal leaves; C. Habit; D. Capitula in a corymbose cyme; E. Capitulum (lateral view); F. Style branches with apical lanceolate appendage in a disk floret; G. Middle phyllary; H. Capitulum (top view); I. Abaxial surface of phyllaries from outer series (left) to inner series (right); J. Ray floret (left) and disc floret (right).
FIGURE 3 in Aster huangpingensis (Asteraceae, Astereae), a new species from Guizhou, China
FIGURE 3. Micrographs of somatic metaphase chromosomes (A) and the karyotype (B) of Aster dolichophyllus.
FIGURE 2 in Aster huangpingensis (Asteraceae, Astereae), a new species from Guizhou, China
FIGURE 2. Micrographs of somatic metaphase chromosomes (A) and the karyotype (B) of Aster huangpingensis.
FIGURE 4. Phylogenetic relationships among A in Aster huangpingensis (Asteraceae, Astereae), a new species from Guizhou, China
FIGURE 4. Phylogenetic relationships among A. huangpingensis and other sampled Aster species based on nrDNA ITS-ETS sequence data. Bayesian posterior probabilities (PP ≥ 0.50, left) and bootstrap support values (1,000 replicates) for maximum parsimony (MP ≥ 50%, right) are provided above the branches. The tree is rooted with Callistephus chinensis and Myriactis nepalensis. The three samples of the new species are indicated in bold.
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