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80 results for “East Antarctica”
FIGURE 5 in Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica)
FIGURE 5. Schizotricha auroraaustralis sp. nov.: A, forked hydrocladial internode showing hydrotheca, nematothecae and apophysis supporting lower-order hydrocladium, and ahydrothecate internode (arrow); B–C, unforked hydrocladial internodes with hydrothecae and nematothecae; D, detail of hydrotheca and nematothecae. Scale bars: 200 µm (A–C), 100 µm (D).
FIGURE 4 in Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica)
FIGURE 4. Schizotricha auroraaustralis sp. nov.: A, hydrocladial branching and hydrothecal disposition; B, cauline internode showing hydrotheca and nematothecae, and first ahydrothecate hydrocladial internode; C, forked hydrocladial internode showing hydrotheca, nematothecae and apophysis supporting lower-order hydrocladium, and two ahydrothecate internodes; D– G, unforked hydrocladial internodes with hydrothecae and nematothecae; H, gonotheca Scale bars: 500 µm (A); 250 µm (B–H).
FIGURE 1. A in Staurastrum antarcticum: a new desmid species from a lake in Oasis Larsemann Hills (East Antarctica)
FIGURE 1. A) Map of Antarctica indicating the position of the sampling site in Oasis Larsemann Hills: LH-59 lake, B) Photograph of lake LH-59 (indicated by arrow), C) The sample of algobacterial mat.
FIGURE 3 in Staurastrum antarcticum: a new desmid species from a lake in Oasis Larsemann Hills (East Antarctica)
FIGURE 3. Scanning electron micrographs of four cells of Staurastrum antarcticum sp. nov., illustrating the presence of mucilage pores and mucilage plugs (indicated by arrows) on the cell wall. Scale bar = 2 µm.
FIGURE 2 in Staurastrum antarcticum: a new desmid species from a lake in Oasis Larsemann Hills (East Antarctica)
FIGURE 2. Light microscopical images of Staurastrum antarcticum sp. nov., from Oasis Larsemann Hills (Antarctica). A, C) Vegetative cells in frontal view, B, D) Vegetative cells in apical view. Scale bar = 10 µm.
Data from: Mollusks from the upper Shackleton Limestone (Cambrian Series 2), Central Transantarctic Mountains, East Antarctica
An assemblage of Cambrian Series 2, Stages 3–4 conchiferan mollusks from the Shackleton Limestone, Transantarctic Mountains, East Antarctica is formally described and illustrated. The fauna includes one bivalve, one macromollusk and ten micromollusks, including the first description of the species Xinjispira simplex outside North China. The new fauna shows some similarity to previously described micromollusks from lower Cambrian glacial erratics from the Antarctic Peninsula. The fauna, mainly composed of steinkerns, is relatively low diversity, but the presence of diagnostic taxa, including helcionelloid Mackinnonia rostrata, bivalve Pojetaia runnegari, cambroclavid Cambroclavus absonus and bradoriid Spinospitella coronata as well as the botsfordiid brachiopod Schizopholis yorkensis in the overlying Holyoake Formation correlates the succession to the Dailyatia odyssei Zone (Cambrian Stage 3–4) in South Australia.
Concentration and spatial variation of atmospheric ice nucleating particles over East Antarctica retrieved from the surface snow
<p>This dataset is the INP concentration in water.</p>
Data from: Mollusks from the upper Shackleton Limestone (Cambrian Series 2), Central Transantarctic Mountains, East Antarctica
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Data from: Brachiopods from the Byrd Group (Cambrian Series 2, Stage 4), Central Transantarctic Mountains, East Antarctica
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Radiation data (2014-2019) at site D17 (Adelie Land, East Antarctica)
<p>This dataset reports raw half-hourly radiative fluxes acquired at site D17 on the marginal slopes of Adelie Land (East Antarctica) and complements another dataset on near-surface meteorological variables including drifting-snow mass fluxes at the same location. The available data have been measured almost continuously since mid February 2014 with a Kipp and Zonen CNR4 net radiometer installed 2 m above ground and include downward/upward shortwave/longwave radiation.</p> <p>Latitude: 66.7°S ; Longitude 139.9°E</p> <p>Date/Time (UTC): Start:2014-02-18 06:00 ; End: 2019-12-07 23:30</p> <p>Elevation 450 m</p> <p>The data files contain the following variables and units:</p> <p>YYYY: year; MM: month; DD: day; hh: hour; mm: minute; SWU: upward shortwave radiation (W m<sup>-2</sup>); SWD: downward shortwave radiation (W m<sup>-2</sup>); LWU: upward longwave radiation (W m<sup>-2</sup>); LWD: downward longwave radiation (W m<sup>-2</sup>); </p>
Hull fouling marine invasive species pose a very low, but plausible, risk of introduction to East Antarctica in climate change scenarios
<p><strong>Aims: </strong>To identify potential hull fouling marine invasive species that could survive in East Antarctica presently and in the future.</p> <p><strong>Location: </strong>Australia's Antarctic continental stations: Davis, Mawson and Casey, East Antarctica; and subantarctic islands: Macquarie Island and Heard and McDonald Islands.</p> <p><strong>Methods: </strong>Our study uses a novel machine-learning algorithm to predict which currently known hull fouling MIS could survive in shallow benthic ecosystems adjacent to Australian Antarctic research stations and subantarctic islands, where ship traffic is present. We used gradient boosted machine learning (XGBoost) with four important environmental variables (sea surface temperature, salinity, nitrate and pH) to develop models of suitable environments for each potentially invasive species. We then used these models to determine if any Australia's three Antarctic research stations and two subantarctic islands could be environmentally suitable for MIS now and under two future climate scenarios.</p> <p><strong>Results: </strong>Most of the species were predicted to be unable to survive at any locations between now and the end of the century, however, four species were identified as potential current threats, and five as threats under future climate change. <em>Asterias amurensis</em> was identified as a potential threat to all locations.</p> <p><strong>Main conclusions: </strong>This study suggests that the risk are very low, but plausible, that known hull fouling species could survive in the shallow benthic habitats near Australia's East Antarctica locations and suggest a precautionary approach is needed by way of surveillance and monitoring in this region, particularly if propagule pressure increases. Whilst some species could survive as adults in the region, their ability to reach these locations and undergo successful reproduction is considered unlikely based on current knowledge.</p>
A decade (2008-2017) of water stable-isotope composition of precipitation at Concordia Station, East Antarctica
<p>A ten-year record of oxygen and hydrogen isotopic composition of precipitation is here presented: from 2008 to 2017, 1483 daily precipitation samples were collected all-year round on a raised platform at Concordia Station, East Antarctica.</p> <p>The dataset is discussed in the following pubblication</p> <p>Dreossi, G., Masiol, M., Stenni, B., Zannoni, D., Scarchilli, C., Ciardini, V., Casado, M., Landais, A., Werner, M., Cauquoin, A., Casasanta, G., Del Guasta, M., Posocco, V., and Barbante, C.: A decade (2008–2017) of water stable-isotope composition of precipitation at Concordia Station, East Antarctica, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-2813, 2023.</p>
Fig. 1 in Oncholaimus langhovdensis sp. nov. (Nematoda: Enoplea: Oncholaimida), a New Species of Free-living Marine Nematode from Langhovde, Dronning Maud Land, East Antarctica
Fig. 1. Oncholaimus langhovdensis sp. nov. Males ICHUM 5311 (holotype; A, C, E, F), 5312 (D), 5313 (G), 5314 (H), and a female ICHUM 5316 (B, I). A, male body; B, female body; C, head, ventral view; D, head, lateral view; E, anterior region; F, male tail, lateral view; G, male tail, lateral view; H, male tail, ventral view; I, female tail, lateral view. Abbreviations: a.t., anterior testis; e.p., excretory pore; i., intestine; n.r., nerve ring; ov., ovary; p., papilla; p.t., posterior testis; ut., uterus; v.d., vas deferens; v.g., ventral gland. Scale bars: A, B, 1 mm; C, D, 20 µm; E, 100 µm; F–I, 50 µm.
Diverse impacts of sea ice and ice shelf melting on phytoplankton communities in the Cosmonaut Sea, East Antarctica
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FIGURE 1 in Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica)
FIGURE 1. Area of study and location of stations.
Hull fouling marine invasive species pose a very low, but plausible, risk of introduction to East Antarctica in climate change scenarios
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Data from: Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21st century
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Supporting data—Heterogeneous basal thermal conditions underpinning the Adélie-George V Coast, East Antarctica
<p>Processed data and logistic regression analysis results from manuscript: Dawson et al., 2024, Heterogeneous basal thermal conditions underpinning the Adélie-George V Coast, East Antarctica, GRL. Refer to the README for more information on each file.</p>
FIG. 1 in First report of diversity of Cyanobacteria of Broknes Peninsula of Larsemann Hills, East Antarctica
FIG. 1. — Base map of Larsemann Hills, Antarctica.
Salinity gradients determine invertebrate distribution in the Prince Charles Mountains, East Antarctica
<p>Raw data and analysis scripts associated with manuscript: "Salinity gradients determine invertebrate distribution in the Prince Charles Mountains, East Antarctica".</p>
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Allen Brain Atlas
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.