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1,337 results for “antarctica”
Fig 3 in Helminth Diversity In Teleost Fishes From The South Orkney Islands Region, West Antarctica
Fig 3. Cluster analysis of the similarity between the helminth communities of the shallow-water (SW) and deepwater (DW) populations of fish species determined by the Bray-Curtis index.
Figure 8 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 8 - The distribution of extant species of Trechisibus, Tasmanorites and Nothofagus and the fossil occurrence of Antarctotrechus balli sp. n. and Nothofagus beardmorensis on the Beardmore Glacier shown by red and green stars: information for Trechisibus species (Allegro et al. 2008) and Tasmanorites (Eberhard S, Giachino, PM, 2011). Base image: NOAA Climate.gov https://www.climate.gov/news-features/understanding-climate/polar-opposites-arctic-and-antarctic
Figure 6 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 6 - Fossil of right elytron of Antarctotrechus balli sp. n. and elytra of three species of Neaustral Trechisibus spp. with line drawings of each showing 3rd interval setigerous pores and recurrent grooves of the latter.
Figure 7 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 7 - Comparison of the apices of the fossil right elytron Antarctotrechus balli sp. n. and a modern Trechisibus sp. with line drawings of each showing 3rd interval setigerous pores and recurrent grooves of the latter. An isodiametric microornament is partially visible on the fossil.
Figure 5 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 5 - Fossils of the left and right elytra of Antarctotrechus balli sp. n. A The left elytron, 2.36 mm in length, is designated as the paratype (USNM: ADP147732). A small part of the right elytron of the same individual is attached along the suture near the apex. The siltstone matrix is visible along the outer margin near the apex. The small rhomb-shaped crystals on the surface are authigenic calcite B The right elytron is designated as the holotype. (NMNH: ADP147741). The elytron is 2.40 mm in length. The base is deformed by a crack and concealed by sediment grains. A small part of the left elytron of the same individual is still attached along the suture near the base.
Figure 3 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 3 - Ancient glacial deposits of the Meyer Desert Formation exposed in the Oliver Bluffs on the flanks of the Beardmore Glacier. The deposits are downthrown along the Koski fault which is marked by the prominent escarpment towards the north end of the bluffs (left on image). The type locality for Antarctotrechus balli sp. n. is at the north end of the bluffs marked by a red star.
Figure 2 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 2 - An aerial view of the Oliver Bluffs on the Beardmore Glacier. Ice flow directions are shown by the blue arrows. The Meyer Desert Formation is downthrown to the north along the Koski Fault. The type locality for Antarctotrechus balli sp. n. is shown by a red star. The aerial image # TMA-2738-4 is from the collections of the The United States Antarctic Resource Center (USARC), USGS, Reston, VA.
Figure 4 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 4 - The type locality for Antarctotrechus balli sp. n. is a siltstone lens within a sequence of lodgement tills exposed in the gulley wall to the left of the person highest in the gully.
Figure 1 from: Ashworth AC, Erwin TL (2016) Antarctotrechus balli sp. n. (Carabidae, Trechini): the first ground beetle from Antarctica. ZooKeys 635: 109-122. https://doi.org/10.3897/zookeys.635.10535
Figure 1 - The type locality for Antarctotrechus balli sp. n. is shown by the red star. Image map is a modified MODIS Mosaic of Antarctica from National Snow and Ice Data Center, http://nsidc.org/data/moa/
ICESat, ERS1, ERS2, Envisat Laser and Radar Altimetry Datasets for the Cryosphere model Comparison Tool (CmCt) Input for Greenland and Antarctica
<div> <p>These datasets contain the ICESat, ERS1, ERS2, Envisat Laser and Radar Altimetry Datasets for CmCt Input data for Greenland and Antarctica. These reference observational datasets are used in the CmCt to compare ice sheet models with.</p> <p>The <strong>ICESat/GLAS</strong> instrument was a lidar altimeter and the primary instrument on the NASA ICESat mission. It took point elevation measurements approximately every 170 meters along its track, and each shot had a footprint of approximately 70 meters in diameter.</p> <p>The GLAS instrument contained 3 lasers, but due to some instrumentation issues, it was decided to turn the lasers on and off during predetermined time periods. For more detailed information about GLAS and the ICESat mission, visit the <a href="http://icesat.gsfc.nasa.gov/icesat/" target="_blank" rel="nofollow noopener noreferrer noopener noreferrer noopener noreferrer">ICESat website</a>.</p> <p>For use with the CmCt project, the Greenland elevation data from ICESat/GLAS (Zwally et al, 2002) were preprocessed. The data were cleaned and limited to the ice sheets. At the time of creation the 634 release of the <a href="https://nsidc.org/data/GLA12/versions/34" target="_blank" rel="nofollow noopener noreferrer noopener noreferrer noopener noreferrer">GLAS12</a> product was used (<em>Zwally et al, 2014</em>). </p> <p>The processing was accomplished by:</p> <ol> <li>restricting the data to GLAS data points only on the ice surface</li> <li>applying two data quality filters we required the GLAS surface reflectivity to be > 0.0375 and we required the uncertainty associated with the GLAS fitting procedure to be < 0.0375 (the numerical coincidence is in fact a coincidence). These are the same quality criteria that were used for <a href="http://imbie.org/" target="_blank" rel="nofollow noopener noreferrer noopener noreferrer noopener noreferrer">IMBIE2</a> and thus are being implemented for the CmCt.</li> <li>checking the data against the reerence DEM (GIMP 90-m DEM for Greenland or Bamber 1-km DEM for Antarctica), requiring the elevation difference to be < 200m.</li> </ol> <p>Please find more details on the data preprocessing in the Supporting Docs tab.</p> <p>The<a href="https://www.esa.int/Applications/Observing_the_Earth/Envisat" target="_blank" rel="nofollow noopener noreferrer noopener noreferrer noopener noreferrer"> <strong>Envisat</strong></a> (Environmental Satellite), <strong><a href="https://eoportal.org/web/eoportal/satellite-missions/e/ers-1" target="_blank" rel="nofollow noopener noreferrer noopener noreferrer noopener noreferrer">ERS1</a></strong>, <strong><a href="https://eoportal.org/web/eoportal/satellite-missions/e/ers-2" target="_blank" rel="nofollow noopener noreferrer noopener noreferrer noopener noreferrer">ERS2</a></strong> (European Remote Sensing Satellites 1 and 2) radar altimeter datasets were also preprocessed to prepare the data to generate a comparison data set for the CmCt. Several filters were used to remove data that are not on the ice sheet or have questionable elevations. Please see the detailed processing descriptions in the Supporting Docs.</p> <p>Radar and laser altimeters measure similar parameters. They measure the time of flight of photons from the spacecraft to the reflection point and back to the spacecraft. The time of flight is then used to calculate an elevation. Accurate elevations require precise knowledge of the spacecraft orbit, corrections for atmospheric scattering, and other factors.</p> <p>There are several differences between the radar and laser altimetry data available here that should be noted:</p> <ul> <li>The accuracy of the elevations calculated from the radar data is generally lower than the accuracy of elevations based on laser data, primarily because <ul> <li>the radar beam is much broader (several km by the time it reaches the ground vs < 100 m for the laser beam).</li> <li>the radar photons penetrate snow and ice a significant amount (cm to m), whereas the laser photons from ICESat penetrate minimally if at all.</li> </ul> </li> <li>ERS and Envisat worked at a lower pulse rate than ICESat, and had a shorter repeat period, so the data are sparser on the ground (but repeat approximately monthly). On the other hand, the radar satellites worked continuously, whereas ICESat only operated for 2-3 months per year. </li> <li>The radar data collectively cover a longer period of time, starting more than a decade earlier and extending past the end of the ICESat data.</li> <li>ERS and Envisat were in orbits that left larger holes at the poles than ICESat (8.5 degrees for the radar satellites vs 4 degrees for ICESat).</li> <li>Radar beams penetrate clouds, whereas the ICESat laser beam was scattered by clouds, with returns becoming unusable if the optical depth was much greater than 1.</li> </ul> <h4> </h4> <h4>Laser and Radar Altimetry Available Data Time Range:</h4> <h4> </h4> <table> <tbody> <tr> <td>ERS1:</td> <td>1991-1995</td> </tr> <tr> <td>ERS2:</td> <td>1996-2002</td> </tr> <tr> <td>Envisat:</td> <td>2003-2012</td> </tr> <tr> <td>ICESat/GLAS:</td> <td>2003-2009</td> </tr> </tbody> </table> <h4> </h4> <h4>Downloading Data</h4> <p><a href="https://theghub.org/resources?id=4737"><strong>The data can be downloaded from the Globus GHub-CmCt endpoint. Please log in and click on the Download tab to receive the Download instructions.</strong></a></p> </div> <h4>References</h4> <div> <p>Howat, I. M., A. Negrete, and B. E. Smith, The Greenland Ice Mapping Project (GIMP) land classification and surface elevation data sets, The Cryosphere 8.4 (2014): 1509-1518.</p> <p> </p> <p>Howat, I. M., A. Negrete, and B. E. Smith. MEaSUREs Greenland Ice Sheet Mapping Project (GIMP) Digital Elevation Model, Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center (2015).</p> <p> </p> <p>Zwally, H. J., et al. ICESat's laser measurements of polar ice, atmosphere, ocean, and land, Journal of Geodynamics 34.3 (2002):405-445.</p> <p> </p> <p>Zwally, H. J., et al. GLAS/ICESat L2 Antarctic and Greenland ice sheet altimetry data V034, National Snow and Ice Data Center, Boulder, Colorado (2014).</p> </div>
Fig. 1. A in A new vesselless angiosperm stem with a cambial variant from the Upper Cretaceous of Antarctica
Fig. 1. A. Location of the new fossil locality in Antarctic Peninsula, James Ross Island (gray). B. Map of James Ross Island at the northern Antarctic Peninsula. C. Map with the Santa Marta Formation outcrops (area shaded in gray) at the northern James Ross Island, showing location of the new fossil locality (asterisk). Modified from Olivero 2012 and Carvalho et al. 2013.
FIG. 2 in Intraindividual variation in nuclear DNA content in Durvillaea antarctica (Chamisso) Hariot, Macrocystis pyrifera (Linnaeus) C. Agardh and Lessonia spicata (Suhr) Santelices (Phaeophyceae)
FIG. 2. — Developmental stages of sporangia in Lessonia spicata (Suhr) Santelices stained with DAPI: A, sporangia (s) and sporangial mother cells (smc); B, four-nucleate sporangium (4-ns) and sporangial mother cells (smc); C, D, different developmental stages of the sporangia. Scale bars A-D, 5 μm.
Diverse impacts of sea ice and ice shelf melting on phytoplankton communities in the Cosmonaut Sea, East Antarctica
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Figure 3 from: Cao S, Zhang F, Zheng H, Liu C, Peng F, Zhou Q (2018) Coccomyxa antarctica sp. nov. from the Antarctic lichen Usnea aurantiacoatra. PhytoKeys 98: 107-115. https://doi.org/10.3897/phytokeys.98.25360
Figure 3 The NJ tree based on ITS rDNA (a) and SSU rDNA (b) sequences phylogenetic analyses. The sequences obtained by the authors were exhibited in bold font. The clades referred to Malavasi et al. (2016).
Figure 2 from: Cao S, Zhang F, Zheng H, Liu C, Peng F, Zhou Q (2018) Coccomyxa antarctica sp. nov. from the Antarctic lichen Usnea aurantiacoatra. PhytoKeys 98: 107-115. https://doi.org/10.3897/phytokeys.98.25360
Figure 2 Ultrastructure of Coccomyxa antarctica Shunan Cao & Qiming Zhou, sp. nov. a–c cultured in BBM medium; d-f cultured in PDA medium. a, b mature autosporangium c, d Cup-shaped chloroplast e, f vegetative cell. Key: Ch: chloroplast; Cw: cell wall; Mit: mitochondria; N: nucleus; S: starch granules; Th: thylakoids. Scale bars: 0.5 μm(a, d); 0.2 μm (b, c, e, f).
Figure 1 from: Cao S, Zhang F, Zheng H, Liu C, Peng F, Zhou Q (2018) Coccomyxa antarctica sp. nov. from the Antarctic lichen Usnea aurantiacoatra. PhytoKeys 98: 107-115. https://doi.org/10.3897/phytokeys.98.25360
Figure 1 Morphology of Coccomyxa antarctica Shunan Cao & Qiming Zhou, sp. nov. a–d cultured in BBM medium; e-f cultured in PDA medium. Scale bars: 10 μm.
FIGURE 1 in Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica)
FIGURE 1. Area of study and location of stations.
Supplementary material 3 from: Cao S, Zhang F, Zheng H, Peng F, Liu C, Zhou Q (2018) Coccomyxa greatwallensis sp. nov. (Trebouxiophyceae, Chlorophyta), a lichen epiphytic alga from Fildes Peninsula, Antarctica. PhytoKeys 110: 39-50. https://doi.org/10.3897/phytokeys.110.26961
Table S3. Comparison of the closely related species :
Supplementary material 1 from: Cao S, Zhang F, Zheng H, Peng F, Liu C, Zhou Q (2018) Coccomyxa greatwallensis sp. nov. (Trebouxiophyceae, Chlorophyta), a lichen epiphytic alga from Fildes Peninsula, Antarctica. PhytoKeys 110: 39-50. https://doi.org/10.3897/phytokeys.110.26961
Table S1. Pairwise distance calculated using ITS rDNA sequences :
Supplementary material 2 from: Cao S, Zhang F, Zheng H, Peng F, Liu C, Zhou Q (2018) Coccomyxa greatwallensis sp. nov. (Trebouxiophyceae, Chlorophyta), a lichen epiphytic alga from Fildes Peninsula, Antarctica. PhytoKeys 110: 39-50. https://doi.org/10.3897/phytokeys.110.26961
Table S2. Pairwise distance calculated using SSU rDNA sequences :
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