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You searched for: Publication year rev 7981-2019 Remove constraint Publication year rev: 7981-2019 Subject Antarctica Remove constraint Subject: Antarctica Subject term Antarctica Remove constraint Subject term: Antarctica
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1. The 2017 catastrophic subsidence in the Dålk Glacier, East Antarctica: unmanned aerial survey and terrain modelling

Author:
I. V. Florinsky; D. P. Bliakharskii
Source:
Remote sensing letters 2019 v.10 no.4 pp. 333-342
ISSN:
2150-7058
Subject:
aerial photography; aerial surveys; caves; data collection; digital elevation models; glaciers; hydrology; ice; lakes; landscapes; remote sensing; snowmelt; subsidence; volcanic activity; Antarctica
Abstract:
... We describe and interpret a catastrophic subsidence in the Dålk Glacier, East Antarctica, occurred in the morning of 30 January 2017. We analysed a dataset of high-resolution aerial photographs and video records captured ten days before, one hour after, and ten days after the event by unmanned aerial systems (UASs) as well as UAS-derived digital elevation models (DEMs). We reconstructed a subsiden ...
DOI:
10.1080/2150704X.2018.1552810

2. Janthinobacterium CG23_2: Comparative Genome Analysis Reveals Enhanced Environmental Sensing and Transcriptional Regulation for Adaptation to Life in an Antarctic Supraglacial Stream

Author:
Markus Dieser; Heidi J. Smith; Thiruvarangan Ramaraj; Christine M. Foreman
Source:
Microorganisms 2019 v.7 no.10 pp. -
ISSN:
2076-2607
Subject:
Janthinobacterium; bacteria; cold; complementary genes; cotton; genomics; glaciers; horizontal gene transfer; indigenous species; locomotion; niches; sequence analysis; shrinkage; streams; stress response; transcription (genetics); Antarctic region; Antarctica
Abstract:
... As many bacteria detected in Antarctic environments are neither true psychrophiles nor endemic species, their proliferation in spite of environmental extremes gives rise to genome adaptations. Janthinobacterium sp. CG23_2 is a bacterial isolate from the Cotton Glacier stream, Antarctica. To understand how Janthinobacterium sp. CG23_2 has adapted to its environment, we investigated its genomic trai ...
DOI:
10.3390/microorganisms7100454
PubMed:
31618878
PubMed Central:
PMC6843130

3. Parageobacillus thermantarcticus, an Antarctic Cell Factory: From Crop Residue Valorization by Green Chemistry to Astrobiology Studies

Author:
Ilaria Finore; Licia Lama; Paola Di Donato; Ida Romano; Annabella Tramice; Luigi Leone; Barbara Nicolaus; Annarita Poli
Source:
Diversity 2019 v.11 no.8 pp. -
ISSN:
1424-2818
Subject:
biodiversity; biological models; biomass; biotechnology; crop residues; employment; exopolysaccharides; green chemistry; habitats; nucleotide sequences; soil; summer; thermophilic bacteria; thermostable enzymes; Antarctic region; Antarctica
Abstract:
... Knowledge of Antarctic habitat biodiversity, both marine and terrestrial, has increased considerably in recent years, causing considerable development in the studies of life science related to Antarctica. In the Austral summer 1986–1987, a new thermophilic bacterium, Parageobacillus thermantarcticus strain M1 was isolated from geothermal soil of the crater of Mount Melbourne (74°22&prime ...
DOI:
10.3390/d11080128

4. Accuracy assessment and waveform analysis of CryoSat-2 SARIn mode data over Antarctica

Author:
Fang Wang; Jonathan L. Bamber; Shuangbao Yang; Xiao Cheng; Shubin Liu; Youzhi Zhang; Yunping Chi
Source:
International journal of remote sensing 2019 v.40 no.22 pp. 8418-8431
ISSN:
1366-5901
Subject:
altimeters; altimetry; dielectric properties; ice; remote sensing; roughness; synthetic aperture radar; topography; Antarctica
Abstract:
... The new synthetic aperture radar interferometric (SARIn) measurement mode of CryoSat-2 provides better performance on the rough topography of the ice sheet margins than that of conventional radar altimetry. We assess the accuracy of CryoSat-2 SARIn mode data from Baseline C product of the European Space Agency (ESA), through comparison with two airborne laser altimeters on NASA IceBridge missions. ...
DOI:
10.1080/01431161.2019.1610985

5. Air monitoring of polychlorinated biphenyls, polybrominated diphenyl ethers and organochlorine pesticides in West Antarctica during 2011–2017: Concentrations, temporal trends and potential sources

Author:
Yanfen Hao; Yingming Li; Xu Han; Thanh Wang; Ruiqiang Yang; Pu Wang; Ke Xiao; Wenjuan Li; Huili Lu; Jianjie Fu; Yawei Wang; Jianbo Shi; Qinghua Zhang; Guibin Jiang
Source:
Environmental pollution 2019 v.249 pp. 381-389
ISSN:
0269-7491
Subject:
DDT (pesticide); HCH (pesticide); air; endosulfan; half life; hexachlorobenzene; lindane; monitoring; persistent organic pollutants; polybrominated diphenyl ethers; polychlorinated biphenyls; samplers; Antarctic region; Antarctica
Abstract:
... Annual air samples were collected at various sites in the Fildes Peninsula, West Antarctica from December 2010 to January 2018 using XAD-2 resin passive air samplers to investigate concentrations, temporal trends and potential sources of persistent organic pollutants (POPs) in Antarctic air. Relatively low concentrations of polychlorinated biphenyls (PCBs) (Σ19PCBs: 1.5–29.7 pg/m3), polybrominated ...
DOI:
10.1016/j.envpol.2019.03.039

6. Altitude and fungal diversity influence the structure of Antarctic cryptoendolithic Bacteria communities

Author:
Claudia Coleine; Jason E. Stajich; Nuttapon Pombubpa; Laura Zucconi; Silvano Onofri; Fabiana Canini; Laura Selbmann
Source:
Environmental microbiology reports 2019 v.11 no.5 pp. 718-726
ISSN:
1758-2229
Subject:
Actinobacteria; DNA barcoding; Proteobacteria; altitude; bacterial communities; biodiversity; fungi; ribosomal DNA; rocks; temperature; Antarctic region; Antarctica
Abstract:
... Endolithic growth within rocks is a critical adaptation of microbes living in harsh environments where exposure to extreme temperature, radiation, and desiccation limits the predominant life forms, such as in the ice‐free regions of Continental Antarctica. The microbial diversity of the endolithic communities in these areas has been sparsely examined. In this work, diversity and composition of bac ...
DOI:
10.1111/1758-2229.12788

7. Altitude-dependent accumulation of short chain chlorinated paraffins in fish from alpine lakes and Lhasa river on the Tibetan Plateau

Author:
Bibai Du; Jiali Ge; Ruiqiang Yang; Xu Han; Hui Chen; Juan Li; Lixi Zeng
Source:
Environmental pollution 2019 v.250 pp. 594-600
ISSN:
0269-7491
Subject:
alkanes; altitude; bioaccumulation; environmental fate; fish; lakes; persistent organic pollutants; rivers; Antarctica; China
Abstract:
... High mountain cold-trapping effects can play important roles in the global long-range transport of persistent organic pollutants (POPs). Short chain chlorinated paraffins (SCCPs) have recently been included into the Stockholm Convention as a new class of POPs. However, the long-range transport behavior and environmental fate of SCCPs still remain largely unknown in high-altitude mountain areas. In ...
DOI:
10.1016/j.envpol.2019.04.059

8. Analysis of occurrence, bioaccumulation and molecular targets of arsenic and other selected volcanic elements in Argentinean Patagonia and Antarctic ecosystems

Author:
Paula A. Lamela; Julio A. Navoni; Roberto D. Pérez; Carlos A. Pérez; Cristian L. Vodopivez; Antonio Curtosi; Guillermina A. Bongiovanni
Source:
Science of the total environment 2019 v.681 pp. 379-391
ISSN:
0048-9697
Subject:
X-ray fluorescence spectroscopy; algae; animals; aquifers; arsenic; bacteria; bioaccumulation; biotransformation; bromine; calcium; chlorine; chromium; cobalt; copper; ecosystems; elemental composition; groundwater; iron; manganese; nickel; pollution; polyacrylamide gel electrophoresis; potassium; proteins; rivers; rubidium; selenium; sodium dodecyl sulfate; strontium; sulfur; titanium; vanadium; volcanic activity; volcanoes; water quality; zinc; Andes region; Antarctic region; Antarctica; Argentina; Latin America
Abstract:
... In Latin America, the high proportion of arsenic (As) in many groundwaters and phreatic aquifers is related to the volcanism of the Andean Range. Nevertheless, there is still very little published research on As and other elements occurrence, and/or transference to biota in Southern regions such as Argentinean Patagonia and the South Shetland Islands in Antarctica, where there are active volcanoes ...
DOI:
10.1016/j.scitotenv.2019.05.096

9. Analysis of the temporal–spatial changes in surface radiation budget over the Antarctic sea ice region

Author:
Teng Zhang; Chunxia Zhou; Lei Zheng
Source:
Science of the total environment 2019 v.666 pp. 1134-1150
ISSN:
0048-9697
Subject:
absorption; climate; data collection; global warming; ice; melting; monitoring; net radiation; radiative forcing; satellites; solar radiation; summer; temperature; time series analysis; weather forecasting; Antarctic region; Antarctica; Indian Ocean; Pacific Ocean
Abstract:
... The surface radiation budget (SRB) of the Antarctic sea ice region (ASIR) is important for the climate change in Antarctica, which partly explains the global warming. Long-term (1982–2015) satellite-derived (EUMETSAT Satellite Application Facility on Climate Monitoring, CLARA-A2) and reanalysis (European Centre for Medium-Range Weather Forecasts, ERA-Interim) datasets provided high quality and glo ...
DOI:
10.1016/j.scitotenv.2019.02.264

10. Anaplasmataceae, Borrelia and Hepatozoon agents in ticks (Acari: Argasidae, Ixodidae) from Chile

Author:
Sebastián Muñoz-Leal; Marcos G. Lopes; Arlei Marcili; Thiago F. Martins; Daniel González-Acuña; Marcelo B. Labruna
Source:
Acta tropica 2019 v.192 pp. 91-103
ISSN:
0001-706X
Subject:
Borrelia burgdorferi; Ehrlichia; Hepatozoon; Ixodes; Ornithodoros; Spheniscus; birds; mammals; microorganisms; phylogeny; polymerase chain reaction; reptiles; ticks; Antarctica; Chile
Abstract:
... Microorganisms harbored by Chilean autochthonous ticks have been scarcely studied and current knowledge is restricted to three species of hard ticks only. The current study aimed to assess the presence of Anaplasmataceae, Borrelia and Hepatozoon agents in ticks collected directly from the environment, on reptiles, birds and mammals in twelve localities from northern, central and southern regions o ...
DOI:
10.1016/j.actatropica.2019.02.002

11. Anatomical constraints to nonstomatal diffusion conductance and photosynthesis in lycophytes and bryophytes

Author:
Marc Carriquí; Margalida Roig‐Oliver; Timothy J. Brodribb; Rafael Coopman; Warwick Gill; Kristiina Mark; Ülo Niinemets; Alicia V. Perera‐Castro; Miquel Ribas‐Carbó; Lawren Sack; Tiina Tosens; Mashuri Waite; Jaume Flexas
Source:
new phytologist 2019 v.222 no.3 pp. 1256-1270
ISSN:
0028-646X
Subject:
Bryophyta; carbon dioxide; cell walls; chloroplasts; economics; leaf mass; leaves; nitrogen content; photosynthesis; tissues; vascular plants; Antarctica; Australia; Estonia; Hawaii; Spain
Abstract:
... Photosynthesis in bryophytes and lycophytes has received less attention than terrestrial plant groups. In particular, few studies have addressed the nonstomatal diffusion conductance to CO₂ gₙₛd of these plant groups. Their lower photosynthetic rate per leaf mass area at any given nitrogen concentration compared with vascular plants suggested a stronger limitation by CO₂ diffusion. We hypothesized ...
DOI:
10.1111/nph.15675

12. Angiosperm symbioses with non‐mycorrhizal fungal partners enhance N acquisition from ancient organic matter in a warming maritime Antarctic

Author:
Paul W. Hill; Richard Broughton; Jeremy Bougoure; William Havelange; Kevin K. Newsham; Helen Grant; Daniel V. Murphy; Peta Clode; Soshila Ramayah; Karina A. Marsden; Richard S. Quilliam; Paula Roberts; Caley Brown; David J. Read; Thomas H. Deluca; Richard D. Bardgett; David W. Hopkins; Davey L. Jones
Source:
Ecology letters 2019 v.22 no.12 pp. 2111-2119
ISSN:
1461-023X
Subject:
Antarctic plants; Ascomycota; Colobanthus quitensis; Deschampsia antarctica; amino acids; carbon dioxide; carbon sinks; ecosystems; endophytes; indigenous species; mosses and liverworts; mycorrhizal fungi; organic nitrogen; peat; peptides; roots; symbiosis; vascular plants; Antarctic region; Antarctica
Abstract:
... In contrast to the situation in plants inhabiting most of the world’s ecosystems, mycorrhizal fungi are usually absent from roots of the only two native vascular plant species of maritime Antarctica, Deschampsia antarctica and Colobanthus quitensis. Instead, a range of ascomycete fungi, termed dark septate endophytes (DSEs), frequently colonise the roots of these plant species. We demonstrate that ...
DOI:
10.1111/ele.13399
PubMed:
31621153
PubMed Central:
PMC6899649

13. Antarctic Studies Show Lichens to be Excellent Biomonitors of Climate Change

Author:
Leopoldo G. Sancho; Ana Pintado; T. G. Allan Green
Source:
Diversity 2019 v.11 no.3 pp. -
ISSN:
1424-2818
Subject:
air pollution; climate; climate change; environmental factors; indicator species; lichens; monitoring; species diversity; temperature; thallus; Antarctic region; Antarctica
Abstract:
... Lichens have been used as biomonitors for multiple purposes. They are well-known as air pollution indicators around urban and industrial centers. More recently, several attempts have been made to use lichens as monitors of climate change especially in alpine and polar regions. In this paper, we review the value of saxicolous lichens for monitoring environmental changes in Antarctic regions. The pr ...
DOI:
10.3390/d11030042

14. An Antarctic flock under the Thorson's rule: Diversity and larval development of Antarctic Velutinidae (Mollusca: Gastropoda)

Author:
Giulia Fassio; Maria Vittoria Modica; Maria Chiara Alvaro; Barbara Buge; Daniele Salvi; Marco Oliverio; Stefano Schiaparelli
Source:
Molecular phylogenetics and evolution 2019 v.132 pp. 1-13
ISSN:
1055-7903
Subject:
Gastropoda; biogeography; data collection; flocks; internal transcribed spacers; larvae; larval development; phylogeny; ribosomal DNA; Antarctic region; Antarctica
Abstract:
... In most marine gastropods, the duration of the larval phase is a key feature, strongly influencing species distribution and persistence. Antarctic lineages, in agreement with Thorson's rule, generally show a short pelagic developmental phase (or lack it completely), with very few exceptions. Among them is the ascidian-feeding gastropod family Velutinidae, a quite understudied group. Based on a mul ...
DOI:
10.1016/j.ympev.2018.11.017

15. Antarctic heterotrophic bacterium Hymenobacter nivis P3T displays light‐enhanced growth and expresses putative photoactive proteins

Author:
Mia Terashima; Keisuke Ohashi; Taichi E. Takasuka; Hisaya Kojima; Manabu Fukui
Source:
Environmental microbiology reports 2019 v.11 no.2 pp. 227-235
ISSN:
1758-2229
Subject:
Hymenobacter; algal blooms; bacteria; cryptochromes; deoxyribodipyrimidine photo-lyase; genes; phenotype; phytochrome; polymers; protein synthesis; proteome; proteomics; rhodopsin; snow; ultraviolet radiation; Antarctic region; Antarctica
Abstract:
... Hymenobacter nivis P3ᵀ is a heterotrophic bacterium isolated from Antarctic red snow generated by algal blooms. Despite being non‐photosynthetic, H. nivis was dominantly found in the red snow environment that is exposed to high light and UV irradiation, suggesting that this species can flourish under such harsh conditions. In order to further understand the adaptive strategies on the snow surface ...
DOI:
10.1111/1758-2229.12702

16. Antarctica Crossing World Record: A Case Study on the Use of Functional Nutrition and Its Effect on Nutrient Demand, Body Composition and Selected Biomarkers of Performance (P12-052-19)

Author:
Carina Kern; Kristine Polley; Meghan Hamrock; Weston Bussler; Karma James; Saradhadevi Varadharaj; John Troup
Source:
Current developments in nutrition 2019 v.3 no.Supplement_1 pp. -
ISSN:
2475-2991
Subject:
alanine transaminase; aspartate transaminase; athletes; biomarkers; body fat; body weight; carbohydrate content; carbohydrates; case studies; cortisol; crossing; diet; estradiol; exercise; hematologic tests; ingredients; lactate dehydrogenase; lipid content; liver; males; muscle tissues; nutritional status; optimal nutrition; protein content; sports; testosterone; vitamin D; weight loss; Antarctica
Abstract:
... Chronic high-intensity exercise in extreme conditions requires high nutrient demand and places high strain on an athlete's body. Without balanced nutrition, these challenges will result in caloric deficit, loss of muscle mass and have associated negative physiological effects. Optimal nutrition can help manage and mitigate limits of extreme human performance and support recovery. Purpose: To asses ...
DOI:
10.1093/cdn/nzz035.P12-052-19

17. Antarctica: The final frontier for marine biological invasions

Author:
Arlie H. McCarthy; Lloyd S. Peck; Kevin A. Hughes; David C. Aldridge
Source:
Global change biology 2019 v.25 no.7 pp. 2221-2241
ISSN:
1354-1013
Subject:
anthropogenic activities; anthropogenic stressors; biodiversity; climate change; cryptogenic species; ecological invasion; ecosystem services; ecosystems; issues and policy; laws and regulations; ocean acidification; pollution; risk; tourism; Antarctic region; Antarctica
Abstract:
... Antarctica is experiencing significant ecological and environmental change, which may facilitate the establishment of non‐native marine species. Non‐native marine species will interact with other anthropogenic stressors affecting Antarctic ecosystems, such as climate change (warming, ocean acidification) and pollution, with irreversible ramifications for biodiversity and ecosystem services. We rev ...
DOI:
10.1111/gcb.14600
PubMed:
31016829
PubMed Central:
PMC6849521

18. Assessing status and trends of open ocean habitats: a regionally resolved approach and Southern Ocean application

Author:
Rowan Trebilco; Jess Melbourne-Thomas; Michael Sumner; Simon Wotherspoon; Andrew Constable
Source:
Ecological indicators 2019 pp. -
ISSN:
1470-160X
Subject:
Euphausia superba; case studies; chlorophyll; climate change; cold zones; decision making; ecosystems; environmental indicators; habitats; ice cover; krill; latitude; oceans; remote sensing; sea ice; surface water temperature; Antarctica
Abstract:
... Assessing the status and trends of habitats, species, and ecosystems in the vast, remote, and difficult to observe open oceans is a pressing challenge for conserving and managing marine species and ecosystems under a changing climate. Here, we present a framework for assessing the status and trends of key ocean habitat components using synoptic data sources. It aims to quantify ecosystem variabili ...
DOI:
10.1016/j.ecolind.2019.105616

19. Assessing the Risk of Metals and Their Mixtures in the Antarctic Nearshore Marine Environment with Diffusive Gradients in Thin-Films

Author:
Darren J. Koppel; Catherine K. King; Kathryn E. Brown; Gwilym A. V. Price; Merrin S. Adams; Dianne F. Jolley
Source:
Environmental science & technology 2019 v.54 no.1 pp. 306-315
ISSN:
1520-5851
Subject:
ecotoxicology; guidelines; marine environment; risk; risk assessment; technology; toxicity; water quality; Antarctic region; Antarctica; New Zealand
Abstract:
... Robust environmental assessments and contaminant monitoring in Antarctic near-shore marine environments need new techniques to overcome challenges presented by a highly dynamic environment. This study outlines an approach for contaminant monitoring and risk assessment in Antarctic marine conditions using diffusive gradients in thin-films (DGT) coupled to regionally specific ecotoxicology data and ...
DOI:
10.1021/acs.est.9b04497

20. Australian-Antarctic breakup and seafloor spreading: Balancing geological and geophysical constraints

Author:
Simon E. Williams; Joanne M. Whittaker; Jacqueline A. Halpin; R. Dietmar Müller
Source:
Earth-science reviews 2019 v.188 pp. 41-58
ISSN:
0012-8252
Subject:
Mesozoic era; geophysics; magnetism; models; stratigraphy; tectonics; Antarctica; Australia
Abstract:
... The motion of diverging tectonic plates is typically constrained by geophysical data from preserved ocean crust. However, constraining plate motions during continental rifting and the breakup process relies on balancing evidence from a diverse range of geological and geophysical observations, often subject to differing interpretations. Reconstructing the evolution of rifting and breakup between Au ...
DOI:
10.1016/j.earscirev.2018.10.011

21. Automatically Extracted Antarctic Coastline Using Remotely-Sensed Data: An Update

Author:
Yining Yu; Zhilun Zhang; Mohammed Shokr; Fengming Hui; Xiao Cheng; Zhaohui Chi; Petra Heil; Zhuoqi Chen
Source:
Remote Sensing 2019 v.11 no.16 pp. -
ISSN:
2072-4292
Subject:
Landsat; algorithms; automation; coasts; ice; ice shelf; remote sensing; Antarctic region; Antarctica
Abstract:
... The temporal and spatial variability of the Antarctic coastline is a clear indicator of change in extent and mass balance of ice sheets and shelves. In this study, the Canny edge detector was utilized to automatically extract high-resolution information of the Antarctic coastline for 2005, 2010, and 2017, based on optical and microwave satellite data. In order to improve the accuracy of the extrac ...
DOI:
10.3390/rs11161844

22. Bacterial Community Composition and Diversity Respond to Nutrient Amendment but Not Warming in a Maritime Antarctic Soil

Author:
Kevin K. Newsham; Binu M. Tripathi; Ke Dong; Naomichi Yamamoto; Jonathan M. Adams; David W. Hopkins
Source:
Microbial ecology 2019 v.78 no.4 pp. 974-984
ISSN:
0095-3628
Subject:
Arthrobacter; bacterial communities; community structure; ecosystems; field experimentation; genes; global warming; greenhouse gas emissions; phylogeny; plant growth; ribosomal RNA; sequence analysis; soil; soil bacteria; Antarctic region; Antarctica
Abstract:
... A resumption of climate warming in maritime Antarctica, arising from continued greenhouse gas emissions to the atmosphere, is predicted to lead to further expansions of plant populations across the region, with consequent increases in nutrient inputs to soils. Here, we test the main and interactive effects of warming, applied with open top chambers (OTCs), and nutrient amendment with tryptic soy b ...
DOI:
10.1007/s00248-019-01373-z

23. Bamboo fossils from Oligo–Pliocene sediments of northeast India with implications on their evolutionary ecology and biogeography in Asia

Author:
Gaurav Srivastava; Tao Su; Rakesh Chandra Mehrotra; Pushpa Kumari; Uma Shankar
Source:
Review of palaeobotany and palynology 2019 v.262 pp. 17-27
ISSN:
0034-6667
Subject:
Miocene epoch; Oligocene epoch; Pliocene epoch; bamboos; biogeography; climate; climate change; culms; flowering; fossils; leaves; new species; niches; phylogeny; sediments; tectonics; Antarctica; Europe; India
Abstract:
... Bamboos comprise the subfamily Bambusoideae distributed in all continents except for Antarctica and Europe. They occupy varied habitats and are sensitive to climate change. They have sporadic flowering and low rates of dispersal, which make them indigenous and characteristic of the continents in which they occur. Plate tectonics have also played an important role in their dispersal. The dependency ...
DOI:
10.1016/j.revpalbo.2018.12.002

24. Benthic responses to an Antarctic regime shift: food particle size and recruitment biology

Author:
Paul K. Dayton; Shannon C. Jarrell; Stacy Kim; P. Ed Parnell; Simon F. Thrush; Kamille Hammerstrom; James J. Leichter
Source:
Ecological applications 2019 v.29 no.1 pp. e01823
ISSN:
1051-0761
Subject:
Bacillariophyceae; Bivalvia; Bryozoa; Polychaeta; Sterechinus neumayeri; benthic ecosystems; benthic organisms; climate change; ecological resilience; glaciers; ice; icebergs; invertebrates; iron; melting; monitoring; oceanography; particle size; phytoplankton; primary productivity; spring; Antarctic region; Antarctica; McMurdo Sound
Abstract:
... Polar ecosystems are bellwether indicators of climate change and offer insights into ecological resilience. In this study, we describe contrasting responses to an apparent regime shift of two very different benthic communities in McMurdo Sound, Antarctica. We compared species‐specific patterns of benthic invertebrate abundance and size between the west (low productivity) and east (higher productiv ...
DOI:
10.1002/eap.1823
PubMed:
30601593
PubMed Central:
PMC6850755

25. The Biodiversity and Geochemistry of Cryoconite Holes in Queen Maud Land, East Antarctica

Author:
Stefanie Lutz; Lori A. Ziolkowski; Liane G. Benning
Source:
Microorganisms 2019 v.7 no.6 pp. -
ISSN:
2076-2607
Subject:
bacterial communities; biodiversity; carbon; genes; geochemistry; high-throughput nucleotide sequencing; ice; lakes; oases; ribosomal RNA; snow; soil; stable isotopes; summer; Antarctic region; Antarctica; Arctic region
Abstract:
... Cryoconite holes are oases of microbial diversity on ice surfaces. In contrast to the Arctic, where during the summer most cryoconite holes are ‘open’, in Continental Antarctica they are most often ‘lidded’ or completely frozen year-round. Thus, they represent ideal systems for the study of microbial community assemblies as well as carbon accumulation, since individual cryo ...
DOI:
10.3390/microorganisms7060160
PubMed:
31159414
PubMed Central:
PMC6616603

26. Biogeochemical proxies and diatoms in surface sediments across the Drake Passage reflect oceanic domains and frontal systems in the region

Author:
Paola Cárdenas; Carina B. Lange; Maria Vernet; Oliver Esper; Benjamin Srain; Maria-Elena Vorrath; Sophie Ehrhardt; Juliane Müller; Gerhard Kuhn; Helge W. Arz; Lester Lembke-Jene; Frank Lamy
Source:
Progress in oceanography 2019 v.174 pp. 72-88
ISSN:
0079-6611
Subject:
Bacillariophyceae; Retaria; basins; biogeography; calcium carbonate; calibration; carbon nitrogen ratio; data collection; ice; microfossils; nitrogen; observational studies; oceans; opal; organic carbon; photosynthesis; pigments; sediments; stable isotopes; sterols; water currents; weather; Antarctic region; Antarctica; South America
Abstract:
... The Antarctic Circumpolar Current is the world’s largest current system connecting all major ocean basins of the global ocean. Its flow, driven by strong westerly winds, is constricted to its narrowest extent in the Drake Passage, located between South America and the Antarctic Peninsula. Due to the remoteness of the area, harsh weather conditions and strong bottom currents, sediment recovery is d ...
DOI:
10.1016/j.pocean.2018.10.004

27. Biosurfactant production by yeasts from different types of soil of the South Shetland Islands (Maritime Antarctica)

Author:
J.L. Bueno; P.A.D. Santos; R.R. da Silva; I.S. Moguel; A. Pessoa Jr; M.V. Vianna; F.C. Pagnocca; L.D. Sette; D.B. Gurpilhares
Source:
Journal of applied microbiology 2019 v.126 no.5 pp. 1402-1413
ISSN:
1364-5072
Subject:
Candida; biosurfactants; carbon; carbon nitrogen ratio; developmental stages; emulsifying; enzymes; fermentation; glycerol; soil; yeast extract; yeasts; Antarctic region; Antarctica
Abstract:
... AIM: To screen and identify a potential biosurfactant‐producing yeast strain isolated from Antarctic soil and to evaluate the fermentation process kinetics of the most promising strain on biosurfactant production using glycerol as carbon source. METHODS AND RESULTS: From the 68 isolated yeast strains, 11 strains were able to produce biosurfactants after Emulsification Index (E.I.) and Drop Collaps ...
DOI:
10.1111/jam.14206

28. Biosynthetic Potential of a Novel Antarctic Actinobacterium Marisediminicola antarctica ZS314T Revealed by Genomic Data Mining and Pigment Characterization

Author:
Li Liao; Shiyuan Su; Bin Zhao; Chengqi Fan; Jin Zhang; Huirong Li; Bo Chen
Source:
Marine drugs 2019 v.17 no.7 pp. -
ISSN:
1660-3397
Subject:
Actinobacteria; biosynthesis; carotenoids; enzymes; genomics; littoral zone; multigene family; nonribosomal peptides; oligosaccharides; pigments; sediments; temperature; Antarctic region; Antarctica
Abstract:
... Rare actinobacterial species are considered as potential resources of new natural products. Marisediminicola antarctica ZS314T is the only type strain of the novel actinobacterial genus Marisediminicola isolated from intertidal sediments in East Antarctica. The strain ZS314T was able to produce reddish orange pigments at low temperatures, showing characteristics of carotenoids. To understand the b ...
DOI:
10.3390/md17070388
PubMed:
31266176
PubMed Central:
PMC6669644

29. Biotic Interactions in Experimental Antarctic Soil Microcosms Vary with Abiotic Stress

Author:
E. Ashley Shaw; Diana H. Wall
Source:
Soil systems 2019 v.3 no.3 pp. -
ISSN:
2571-8789
Subject:
Collembola; Eudorylaimus; Rotifera; Tardigrada; abiotic stress; adults; biodiversity; cold; ecological communities; environmental factors; glaciers; landscapes; melting; mites; permafrost; salinity; soil bacteria; soil ecosystems; soil food webs; soil invertebrates; soil water; solutes; temperate soils; valleys; vascular plants; vertebrates; Antarctic region; Antarctica
Abstract:
... Biotic interactions structure ecological communities but abiotic factors affect the strength of these relationships. These interactions are difficult to study in soils due to their vast biodiversity and the many environmental factors that affect soil species. The McMurdo Dry Valleys (MDV), Antarctica, are relatively simple soil ecosystems compared to temperate soils, making them an excellent study ...
DOI:
10.3390/soilsystems3030057

30. Canine and Phocine Distemper Viruses: Global Spread and Genetic Basis of Jumping Species Barriers

Author:
Judith M. Kennedy; J.A. Philip Earle; Shadia Omar; Hani’ah Abdullah; Ole Nielsen; Melody E. Roelke-Parker; S. Louise Cosby
Source:
Viruses 2019 v.11 no.10 pp. -
ISSN:
1999-4915
Subject:
Canine morbillivirus; Primates; binding sites; carnivores; cats; distemper; dogs; hemagglutinins; host range; hosts; lymphocyte proliferation; mortality; nucleotide sequences; pathogenicity; phosphoproteins; seals; vaccines; viruses; wildlife; wildlife diseases; zoonoses; Antarctica; Pacific Ocean; South Africa
Abstract:
... Canine distemper virus (CDV) and phocine distemper (PDV) are closely-related members of the Paramyxoviridae family, genus morbillivirus, in the order Mononegavirales. CDV has a broad host range among carnivores. PDV is thought to be derived from CDV through contact between terrestrial carnivores and seals. PDV has caused extensive mortality in Atlantic seals and other marine mammals, and more rece ...
DOI:
10.3390/v11100944
PubMed:
31615092
PubMed Central:
PMC6833027

31. Carotenoids from heterotrophic bacteria isolated from Fildes Peninsula, King George Island, Antarctica

Author:
Eugenia Vila; Dámaso Hornero-Méndez; Gastón Azziz; Claudia Lareo; Verónica Saravia
Source:
Biotechnology reports 2019 v.21 pp. e00306
ISSN:
2215-017X
Subject:
Arthrobacter; Chryseobacterium; Cryobacterium; Firmicutes; Flavobacterium; Zobellia; antioxidants; bacteria; beta-carotene; beta-cryptoxanthin; biotechnology; chromatography; dyes; feed industry; fruits; glucosides; lycopene; ribosomal RNA; sequence analysis; spectral analysis; synthesis; vegetables; zeaxanthin; Antarctica
Abstract:
... Carotenoids are isoprenoid pigments used by pharmaceutical, cosmetic, food and feed industry as antioxidants and colorants. Although traditional sources of carotenoids are fruits, vegetables and chemical synthesis, prospecting for alternative sinks of common and/or unusual carotenoids is important for the development of natural carotenoid industry.In this work, 30 pigmented bacterial strains from ...
DOI:
10.1016/j.btre.2019.e00306
PubMed:
30705834
PubMed Central:
PMC6348148

32. Chachezhania antarctica gen. nov., sp. nov., a novel member of the family ‘Rhodobacteraceae’ isolated from Antarctic seawater

Author:
Xiao-xue Yuan; Ning Wang; Meng-yao Zhang; Xiu-lan Chen; Chun-yang Li; Yu-zhong Zhang; Mei Shi; Xi-ying Zhang
Source:
Antonie van Leeuwenhoek 2019 v.112 no.12 pp. 1841-1848
ISSN:
0003-6072
Subject:
bacteria; fatty acids; new genus; new species; nucleotide sequences; phosphatidylcholines; phylogeny; ribosomal DNA; ribosomal RNA; seawater; sequence homology; sodium chloride; Antarctic region; Antarctica
Abstract:
... A Gram-stain-negative, aerobic, non-flagellated, rod-shaped bacterium, designated strain SM1703ᵀ, was isolated from Antarctic seawater collected near the Chinese Antarctic Great Wall Station, King George Island, West Antarctica. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain SM1703ᵀ formed a distinct phylogenetic lineage within the family ‘Rhodobacteraceae’, sharing hi ...
DOI:
10.1007/s10482-019-01301-8

33. Changes in Global Cloud Cover Based on Remote Sensing Data from 2003 to 2012

Author:
Kebiao Mao; Zijin Yuan; Zhiyuan Zuo; Tongren Xu; Xinyi Shen; Chunyu Gao
Source:
Chinese geographical science 2019 v.29 no.2 pp. 306-315
ISSN:
1002-0063
Subject:
carbon; climate change; cloud cover; geographical distribution; hydrology; latitude; moderate resolution imaging spectroradiometer; nitrogen; spatial data; sulfur; temperature; Antarctica; Europe; North America; Pacific Ocean; Pacific Ocean Islands; South East Asia
Abstract:
... As is well known, clouds impact the radiative budget, climate change, hydrological processes, and the global carbon, nitrogen and sulfur cycles. To understand the wide-ranging effects of clouds, it is necessary to assess changes in cloud cover at high spatial and temporal resolution. In this study, we calculate global cloud cover during the day and at night using cloud products estimated from Mode ...
DOI:
10.1007/s11769-019-1030-6

34. Changes in Water Soluble Protein Profile of Antarctic Cyanobacterium Nostoc Commune under Temperature Downshift from 25° to 5 °C

Author:
Ranjana Tripathi; Pradeep Kumar Rai; Anuradha Rai; Surendra Singh
Source:
Geomicrobiology journal 2019 v.36 no.3 pp. 271-277
ISSN:
1521-0529
Subject:
Cyanobacterium (genus); Nostoc commune; acclimation; cold; cold stress; dissociation; molecular weight; oases; protein composition; proteins; proteome; sodium chloride; temperature; water solubility; Antarctic region; Antarctica
Abstract:
... The cyanobacterium Nostoc commune (Nostocales) is an isolate from the Schirmacher Oasis Antarctica. The cyanobacterium is psychrotropic in nature; and maintained in laboratory at 25 °C temperature, in unialgal form. Here, we studied the change in protein profile of water soluble proteins from exponentially growing N. commune upon downshift from its optimum growth temperature (25 °C) to a low tempe ...
DOI:
10.1080/01490451.2018.1555293

35. Characterization of inertia gravity waves and associated dynamics in the lower stratosphere over the Indian Antarctic station, Bharati (69.4°S, 76.2°E) during austral summers

Author:
N. Koushik; Karanam Kishore Kumar; K. V. Subrahmanyam; Geetha Ramkumar; I. A. Girach; M. Santosh; K. Nalini; M. Nazeer; P. R. Shreedevi
Source:
Climate dynamics 2019 v.53 no.5-6 pp. 2887-2903
ISSN:
0930-7575
Subject:
air; climate; data collection; energy; gravity waves; latitude; momentum; stratosphere; summer; troposphere; wavelet; Antarctic region; Antarctica
Abstract:
... Atmospheric gravity waves over the Polar Regions are found to have myriad effects on the dynamics and chemistry of the middle atmosphere. Data collected from high vertical resolution radiosonde measurements carried out in campaign mode from the Indian research base in Antarctica, Bharati (69.4°S, 76.2°E) during the austral summer seasons of 2014–2015, 2015–2016 and 2016–2017 were used to character ...
DOI:
10.1007/s00382-019-04665-9

36. Characterization of the exoskeleton of the Antarctic king crab Paralomis birsteini

Author:
Brittan V. Steffel; Kathryn E. Smith; Gary H. Dickinson; Jennifer A. Flannery; Kerstin A. Baran; Miranda N. Rosen; James B. McClintock; Richard B. Aronson
Source:
Invertebrate biology 2019 v.138 no.2 pp. e12246
ISSN:
1077-8306
Subject:
Callinectes sapidus; Cancer borealis; Paralomis; aquatic organisms; body regions; calcification; calcium; calcium carbonate; crabs; exoskeleton; invasive species; latitude; long term effects; mechanical properties; ocean acidification; predator avoidance; predators; temperature; Antarctic region; Antarctica
Abstract:
... Ocean acidification is projected to inhibit the biogenic production of calcium carbonate skeletons in marine organisms. Antarctic waters represent a natural environment in which to examine the long‐term effects of carbonate undersaturation on calcification in marine predators. King crabs (Decapoda: Anomura: Lithodidae), which currently inhabit the undersaturated environment of the continental slop ...
DOI:
10.1111/ivb.12246

37. Community Structures of Bacteria, Archaea, and Eukaryotic Microbes in the Freshwater Glacier Lake Yukidori-Ike in Langhovde, East Antarctica

Author:
Aoi Chaya; Norio Kurosawa; Akinori Kawamata; Makiko Kosugi; Satoshi Imura
Source:
Diversity 2019 v.11 no.7 pp. -
ISSN:
1424-2818
Subject:
Archaea; Bacillariophyta; Bacteroidetes; Chlorophyta; Ciliophora; Cyanobacteria; DNA; Firmicutes; bacteria; beta-Proteobacteria; biodiversity; clones; community structure; freshwater; glaciers; methanogens; microbial communities; ribosomal RNA; salinity; salt lakes; temperate zones; temperature; Antarctic region; Antarctica
Abstract:
... Since most studies about community structures of microorganisms in Antarctic terrestrial lakes using molecular biological tools are mainly focused on bacteria, limited information is available about archaeal and eukaryotic microbial diversity. In this study, the biodiversity of microorganisms belonging to all three domains in a typical Antarctic freshwater glacier lake (Yukidori-Ike) was revealed ...
DOI:
10.3390/d11070105

38. Comparison of the parasite community of two notothens, Notothenia rossii and N. coriiceps (Pisces: Nototheniidae), from King George Island, Antarctica

Author:
G. Muñoz; M. Rebolledo
Source:
Journal of helminthology 2019 v.93 no.6 pp. 732-737
ISSN:
1475-2697
Subject:
Acanthocephala; Notothenia coriiceps; Notothenia rossii; body length; fish; parasites; parasitism; sympatry; Antarctic region; Antarctica
Abstract:
... In this study, we analysed and compared the whole parasite community from the fish Notothenia rossii and Notothenia coriiceps collected from Fildes Bay at King George Island, Antarctica, during January–February 2017 in a field campaign supported by the Chilean Antarctic Institute. The fish samples collected were 45 specimens of N. rossii and 22 of N. coriiceps, with total lengths averaging 29.7 ± ...
DOI:
10.1017/S0022149X18000858

39. Complete genome and data mining of Aeromicrobium sp. A1–2 isolated from the Southern Ocean

Author:
Li Liao; Shiyuan Su; Yong Yu; Jin Zhang; Bo Chen
Source:
Marine genomics 2019 v.45 pp. 5-7
ISSN:
1874-7787
Subject:
Aeromicrobium; biosynthesis; genome; marine sediments; new species; Antarctica
Abstract:
... Aeromicrobium sp. A1–2, a putative new species isolated from marine sediments in the King George Island, Antarctica, was completely sequenced. The genome data showed biosynthetic potential of new natural products and clues for environmental adaptation of this actinobacterium. ...
DOI:
10.1016/j.margen.2018.10.007

40. Complete genome sequencing of Shigella sp. PAMC 28760: Identification of CAZyme genes and analysis of their potential role in glycogen metabolism for cold survival adaptation

Author:
So-Ra Han; Do Wan Kim; Byeollee Kim; Young Min Chi; Seunghyun Kang; Hyun Park; Sang-Hee Jung; Jun Hyuck Lee; Tae-Jin Oh
Source:
Microbial pathogenesis 2019 v.137 pp. 103759
ISSN:
0882-4010
Subject:
DNA; Shigella; bacteria; biochemical pathways; cold; energy conservation; enzymes; glucose; glycogen; lichens; metabolism; new species; nucleotide sequences; operon; ribosomal RNA; sequence analysis; starch; transfer RNA; virulent strains; Antarctic region; Antarctica
Abstract:
... Shigella sp. PAMC 28760 (isolated from Himantormia sp. lichen in Antarctica) is a gram-negative, non-sporulating bacterium that has cellulolytic and amylolytic characteristics as well as glycogen metabolic pathways. In this study, we isolated S. sp. PAMC 28760 from Antarctic lichen, and present the complete genome sequence with annotations describing its unique features. The genome sequence has 58 ...
DOI:
10.1016/j.micpath.2019.103759

41. Concentrations of Thirteen Trace Metals in Scales of Three Nototheniid Fishes from Antarctica (James Ross Island, Antarctic Peninsula)

Author:
Kevin Roche; Jan Kuta; Ivo Sedláček; Rostislav Červenka; Kateřina Tomanová; Pavel Jurajda
Source:
Biological trace element research 2019 v.191 no.1 pp. 214-223
ISSN:
0163-4984
Subject:
Gobionotothen gibberifrons; Notothenia coriiceps; Trematomus bernacchii; aluminum; bioaccumulation; chromium; climate change; coasts; cobalt; diet; fish; food webs; gender differences; habitat preferences; iron; manganese; runoff; sediments; snowmelt; vanadium; volcanic land; zinc; Antarctic region; Antarctica
Abstract:
... In this study, we assessed concentrations of 13 trace metals in the scales of Notothenia coriiceps, Trematomus bernacchii and Gobionotothen gibberifrons caught off the coast of James Ross Island (Antarctic Peninsula). Overall, our results for scales broadly match those of previous studies using different fish and different organs, with most metals found at trace levels and manganese, aluminium, ir ...
DOI:
10.1007/s12011-018-1598-1

42. Concretionary horizons, unusual pedogenetic processes and features of sulfate affected soils from Antarctica

Author:
Davi do Vale Lopes; Carlos Ernesto G.R. Schaefer; José João Lelis Leal de Souza; Fábio Soares de Oliveira; Felipe Nogueira Bello Simas; Mayara Daher; Davi Feital Gjorup
Source:
Geoderma 2019 v.347 pp. 13-24
ISSN:
0016-7061
Subject:
U.S. Soil Taxonomy; acid sulfate soils; aluminum; calcium; cobalt; copper; fluorescence emission spectroscopy; iron; iron oxides; magnesium; nickel; oxidation; potassium; silicon; sodium; soil acidification; soil formation; sulfates; sulfur; toposequences; vanadium; weathering; zinc; Antarctic region; Antarctica; United States
Abstract:
... Although acid sulfate soils have been previously reported in Maritime Antarctica, no detailed study about the nature of the sulfide oxidation process and its effect on pedogenesis has been carried out to this day. The present study evaluate the soil genesis from Barton Peninsula along two toposequences developed under sulfides influence, emphasizing active chemical processes in a typical periglaci ...
DOI:
10.1016/j.geoderma.2019.03.024

43. Contrasting thermal acclimation of leaf dark respiration and photosynthesis of Antarctic vascular plant species exposed to nocturnal warming

Author:
Carolina Sanhueza; Francisca Fuentes; Daniela Cortés; Luisa Bascunan‐Godoy; Patricia L. Sáez; León A. Bravo; Lohengrin A. Cavieres
Source:
Physiologia plantarum 2019 v.167 no.2 pp. 205-216
ISSN:
0031-9317
Subject:
Antarctic plants; Colobanthus quitensis; Deschampsia antarctica; acclimation; carbon; ecosystems; heat treatment; laboratory experimentation; leaves; photosynthesis; starch; sugars; temperature; thermosensitivity; vascular plants; Antarctic region; Antarctica
Abstract:
... Leaf respiration and photosynthesis will respond differently to an increase in temperature during night, which can be more relevant in sensitive ecosystems such as Antarctica. We postulate that the plant species able to colonize the Antarctic Peninsula – Colobanthus quitensis (Kunth) Bartl. and Deschampsia antarctica Desv. – are able to acclimate their foliar respiration and to maintain photosynth ...
DOI:
10.1111/ppl.12881

44. Critical evaluation of a seaFAST system for the analysis of trace metals in marine samples

Author:
Kathrin Wuttig; Ashley T. Townsend; Pier van der Merwe; Melanie Gault-Ringold; Thomas Holmes; Christina Schallenberg; Pauline Latour; Manon Tonnard; Micha J.A. Rijkenberg; Delphine Lannuzel; Andrew R. Bowie
Source:
Talanta 2019 v.197 pp. 653-668
ISSN:
0039-9140
Subject:
atomic absorption spectrometry; buffer index; buffers; cadmium; cleaning; cobalt; copper; data collection; flow injection analysis; ice; iron; lead; manganese; nickel; normal values; oxidation; pH; rain; salinity; seawater; summer; t-test; zinc; Antarctica
Abstract:
... A seawater preconcentration system (seaFAST) with offline sector-field inductively coupled plasma mass spectrometry (SF-ICP-MS) detection was critically evaluated for ultra-low trace elemental analysis of Southern Ocean samples over a four-year period (2015–2018). The commercially available system employs two Nobias PA1 resin columns for buffer cleaning and sample preconcentration, allowing salt m ...
DOI:
10.1016/j.talanta.2019.01.047

45. Data relating to spatial distribution of polycyclic aromatic hydrocarbons in terrestrial soils of Pakistan and King George Island, Antarctica

Author:
Siwatt Pongpiachan; Woranuch Deelaman; Chomsri Choochuay; Natthapong Iadtem; Vanisa Surapipith; Muhammad Zaffar Hashmi; Muhammad Latif; Muhammad Sohail; Syed Ali Musstjab Akber Shah Eqani; Teetat Charoenkalunyuta; Kittiphop Promdee
Source:
Data in Brief 2019 v.25 pp. 104327
ISSN:
2352-3409
Subject:
comprehensive two-dimensional gas chromatography; data collection; Antarctic region; Antarctica; Pakistan
Abstract:
... Over the past few decades, polycyclic aromatic hydrocarbons (PAHs) have been analysed in various environmental compartments, however, only limited information is available associated with their terrestrial concentrations in Pakistan and Antarctica. All terrestrial soils from Pakistan (n = 120) were collected from 14th to 2nd April 2017 at Islamabad (n = 30), Abbotabad (n = 10), Taxilla (n = 5), an ...
DOI:
10.1016/j.dib.2019.104327

46. Dataset of global extreme climatic indices due to an acceleration of ice sheet melting during the 21st century

Author:
Dimitri Defrance
Source:
Data in Brief 2019 v.27 pp. 104585
ISSN:
2352-3409
Subject:
climate; cumulative distribution; data collection; ice; models; sea level; temperature; Antarctica; Greenland
Abstract:
... This article describes extreme indices maps (Data Cube, raster X Time) for different scenarios with a more important contribution to the sea level rise from Greenland and/or Antarctica during the 21st century under the Representative Concentration Pathway (RCP) 8.5 emission scenario. The indices are produced annually and globally with a resolution of 0.5° × 0.5° from 1951 to 2099. The data were ge ...
DOI:
10.1016/j.dib.2019.104585

47. Depositional input of hydrocarbons recorded in sedimentary cores from Deception and Penguin Islands (South Shetland Archipelago, Antarctica)

Author:
Marina Sutilli; Paulo A.L. Ferreira; Rubens C.L. Figueira; César C. Martins
Source:
Environmental pollution 2019 v.253 pp. 981-991
ISSN:
0269-7491
Subject:
alkanes; biomarkers; coal; islands; petroleum; polycyclic aromatic hydrocarbons; power generation; sediments; tourism; traffic; Antarctic region; Antarctica
Abstract:
... Polycyclic aromatic hydrocarbons (PAHs) and aliphatic hydrocarbons (AHs), including petroleum biomarkers, were studied in four sediment cores collected around Deception and Penguin Islands, Antarctica. Total PAHs in Deception Island (DCP) samples ranged from 2.0 to 26.8 ng g⁻¹, and in Penguin Island (PGI) varied between 13.2 and 60.3 ng g⁻¹. Multiple sources of PAHs were verified in DCP, with petr ...
DOI:
10.1016/j.envpol.2019.07.057

48. Detecting the statistical significance of the trends in the Antarctic sea ice extent: an indication for a turning point

Author:
Josef Ludescher; Naiming Yuan; Armin Bunde
Source:
Climate dynamics 2019 v.53 no.1-2 pp. 237-244
ISSN:
0930-7575
Subject:
autumn; climate; ice; seasonal variation; statistical models; Antarctic region; Antarctica
Abstract:
... In the past decades, the Antarctic sea ice extent (SIE) has been steadily increasing, but recently showed a sharp decline. Here we address the questions whether (1) the observed changes in the Antarctic SIE can be fully explained by natural variability and (2) whether the recent unprecedented decline in the SIE can serve as an indication that the long-term positive trend has reached a turning poin ...
DOI:
10.1007/s00382-018-4579-3

49. Detection of crevasses by geomorphometric treatment of data from unmanned aerial surveys

Author:
I. V. Florinsky; D. P. Bliakharskii
Source:
Remote sensing letters 2019 v.10 no.4 pp. 323-332
ISSN:
2150-7058
Subject:
aerial surveys; digital elevation models; geodesy; glaciers; monitoring; morphometry; remote sensing; snow; Antarctic region; Antarctica
Abstract:
... For Antarctic research, one of the important support tasks is a monitoring of sledge routes and other visited areas for detection of open crevasses and revealing of hidden, snow-covered ones. We study the possibility of revealing hidden crevasses with geomorphometric treatment of high-resolution, glacier digital elevation models (DEMs) produced from imagery captured by unmanned aerial systems (UAS ...
DOI:
10.1080/2150704X.2018.1552809

50. Detection of presumed genes encoding beta-lactamases by sequence based screening of metagenomes derived from Antarctic microbial mats

Author:
Gastón Azziz; Matías Giménez; Héctor Romero; Patricia M. Valdespino-Castillo; Luisa I. Falcón; Lucas A. M. Ruberto; Walter P. Mac Cormack; Silvia Batista
Source:
Frontiers of environmental science & engineering 2019 v.13 no.3 pp. 44
ISSN:
2095-2201
Subject:
Markov chain; antibiotic resistance; antibiotic resistance genes; beta-lactamase; databases; evolution; geographical distribution; metagenomics; models; public health; screening; Antarctic region; Antarctica
Abstract:
... Analysis of environmental samples for bacterial antibiotic resistance genes may have different objectives and analysis strategies. In some cases, the purpose was to study diversity and evolution of genes that could be grouped within a mechanism of antibiotic resistance. Different protocols have been designed for detection and confirmation that a functional gene was found. In this study, we present ...
DOI:
10.1007/s11783-019-1128-1