Showing 13487 items
31 March, 2021 by Cameron Fox-Clarke, Camille Toscani, Claire Stainfield, Jaume Forcada
Allee effects play an important role in the dynamics of many populations and can increase the risk of local extinction. However, some authors have questioned the weight of evidence for…Read more on Evidence for an Allee effect in a declining fur seal population
28 March, 2021 by Louise Sime
Changes of the topography of the Antarctic ice sheet (AIS) can complicate the interpretation of ice core water stable isotope measurements in terms of temperature. Here, we use a set…
28 March, 2021 by Nigel Meredith, Richard Horne
We use data from eight satellites to statistically examine the role of chorus as a potential source of plasmaspheric hiss. We find that the strong equatorial (|λm| < 6o) chorus…
26 March, 2021 by Alex Brisbourne, Andy Smith, Sofia-Katerina Kufner
Microseismicity, induced by the sliding of a glacier over its bed, can be used to characterize frictional properties of the ice‐bed interface, which are a key parameter controlling ice stream…
25 March, 2021 by Adrian Jenkins, Louis-Alexandre Couston, Paul Holland
We report an idealized numerical study of a melting and freezing solid adjacent to a turbulent, buoyancy-affected shear flow, in order to improve our understanding of topography generation by phase…Read more on Topography generation by melting and freezing in a turbulent shear flow
25 March, 2021 by Peter Convey
The Antarctic Peninsula is under pressure from non-native plants and this risk is expected to increase under climate warming. Establishment and subsequent range expansion of non-native plants depend in part…Read more on Warming impacts potential germination of non-native plants on the Antarctic Peninsula
25 March, 2021 by Hugh Corr
Curvilinear channels on the surface of an ice shelf indicate the presence of large channels at the base. Modelling studies have shown that where these surface expressions intersect the grounding…24 March, 2021 by Fabian Haumann, Michael Meredith
The Atlantic sector of the Southern Ocean is the world’s main production site of Antarctic Bottom Water, a water-mass that is ventilated at the ocean surface before sinking and entraining…Read more on Ventilation of the abyss in the Atlantic sector of the Southern Ocean
22 March, 2021 by Emma Woodfield, Jade Reidy, Johnathan Ross, Mark Clilverd, Nigel Meredith, Richard Horne, Sarah Glauert, Jade Reidy
Particle precipitation is a loss mechanism from the Radiation Belts whereby particles trapped by the Earth’s magnetic field are scattered into the loss cone due to wave‐particle interactions. Energetic electron…
20 March, 2021 by Emma Young, Simon Morley
While there is now strong evidence that many factors can shape dispersal, the mechanisms influencing connectivity patterns are species‐specific and remain largely unknown for many species with a high dispersal…19 March, 2021 by Maximilian Lowe
In this study, we present an estimate of the gravity signal of the slabs beneath the Alpine mountain belt. Estimates of the gravity effect of the subducting slabs are often…Read more on Gravity effect of Alpine slab segments based on geophysical and petrological modelling
17 March, 2021 by Robert Mulvaney
The spatial glaciochemical variability of snow samples collected along a transect from Zhongshan Station to Lambert Glacier Basin 69 (LGB69) in Antarctica was investigated. Sea-salt ion concentrations exponentially decreased with…
17 March, 2021 by Peter Convey
We assess the fungal diversity present in permafrost from different islands in the South Shetland Islands archipelago, maritime Antarctic, using next-generation sequencing (NGS). We detected 1,003,637 fungal DNA reads representing,…
16 March, 2021 by Richard Horne
Pc1 geomagnetic pulsations, equivalent to electromagnetic ion cyclotron waves in the magnetosphere, display a specific amplitude modulation, though the region of the modulation remains an open issue. To classify whether…
16 March, 2021 by Alexander Lozinski, Richard Horne, Sarah Glauert
Proton flux measurements from the Proton Telescope instrument aboard the CRRES satellite are revisited, and used to drive a radial diffusion model of the inner proton belt at 1.1 ≤…
16 March, 2021 by Sofia-Katerina Kufner
Break-off of part of the down-going plate during continental collision occurs due to tensile stresses built-up between the deep and shallow slab, for which buoyancy is increased because of continental-crust…Read more on The Hindu Kush slab break-off as revealed by deep structure and crustal deformation.
12 March, 2021 by Anna Jones, Alexandra Weiss, James France, Thomas Lachlan-Cope
The North Sea is Europe's key oil and gas (O&G) basin with the output currently meeting 3 %–4 % of global oil supply. Despite this, there are few observational constraints on the…Read more on Speciation of VOC emissions related to offshore North Sea oil and gas production
12 March, 2021 by Elaine Mawbey
Theory suggests that the ocean's biological carbon pump, the process by which organic matter is produced at the surface and transferred to the deep ocean, is sensitive to temperature because…
9 March, 2021 by Fausto Ferraccioli
We present a new magnetic compilation for Central Gondwana conformed to a recent satellite magnetic model (LCS-1) with the help of an equivalent layer approach, resulting in consistent levels, corrections…Read more on East Antarctica magnetically linked to its ancient neighbours in Gondwana
8 March, 2021 by Mark Clilverd
In recent years there has been a growing body of direct experimental evidence demonstrating electromagnetic ion cyclotron (EMIC) waves driving energetic electron precipitation (EEP) at unexpectedly low, sub‐MeV energies —…
5 March, 2021 by James France
Sea ice is difficult, expensive, and potentially dangerous to observe in nature. The remoteness of the Arctic and Southern Oceans complicates sampling logistics, while the heterogeneous nature of sea ice…
5 March, 2021 by Claire Allen, Dieter Tetzner, Liz Thomas
The insoluble particulate matter deposited on ice sheets provide key information to reconstruct past climate. The low concentration of some insoluble particulate matter, such as terrigenous particles and microfossils, challenges…
4 March, 2021 by Connor Bamford, Iain Staniland, Jennifer Jackson, Philip Trathan, Victoria Warwick-Evans
The diet of Antarctic fur seals (Arctocephalus gazella) at South Georgia is dominated by Antarctic krill (Euphausia superba). During the breeding season, foraging trips by lactating female fur seals are…
3 March, 2021 by Amy King, Liz Thomas
The sub-Antarctic is one of the most data-sparse regions on earth. A number of glaciated Antarctic and sub-Antarctic islands have the potential to provide unique ice core records of past…Read more on Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands
3 March, 2021 by Richard Phillips
Migratory marine species cross political borders and enter the high seas, where the lack of an effective global management framework for biodiversity leaves them vulnerable to threats. Here, we combine…Read more on Global political responsibility for the conservation of albatrosses and large petrels
2 March, 2021 by Peter Convey
We evaluated the fungal diversity associated with carbonate veins and two types of salt encrustation in rocks in a polar desert region of continental Antarctica using DNA a metabarcoding approach.…1 March, 2021 by Joseph Ulanowski
The cloud particle concentration, size, and shape data from optical array probes (OAPs) are routinely used to parameterise cloud properties and constrain remote sensing retrievals. This paper characterises the optical…
1 March, 2021 by Kevin Newsham
Despite nematodes routinely being the most frequent soil- and bryophyte-associated animals in maritime Antarctica, there is a lack of clarity about the influence of warming on their populations in the…
1 March, 2021 by Kevin Newsham, Marta Misiak, Roger Worland, Peter Convey
Temperatures approaching or exceeding 20 °C have been measured during summer in polar regions at the surfaces of barren fellfield soils under cloudless skies around solar noon. However, despite the…
1 March, 2021 by Andrew Orr, Emily Potter
Many of the glaciers in the Nepalese Himalaya are partially covered in a layer of loose rock known as debris cover. In the Dudh Koshi River Basin, Nepal, approximately 25%…
1 March, 2021 by Peter Convey
Climate change in the Antarctic over the past 50+ years has caused contraction of ice and snow cover, longer melt seasons and intensified glacier melting. These changes affect erosion and…1 March, 2021 by Simon Morley
Members of the trochoidean genus Margarella (Calliostomatidae) are broadly distributed across Antarctic and sub-Antarctic ecosystems. Here we used novel mitochondrial and nuclear gene sequences to clarify species boundaries and phylogenetic…
1 March, 2021 by Andrew Wood, Andrew Fleming, Mark Belchier, Norman Ratcliffe, Simeon Hill, Sophie Fielding, Susie Grant
AIM: Management of competition with predators is an important consideration for fisheries, particularly within marine protected areas (MPAs) where conservation is a primary objective. We aimed to test whether static…1 March, 2021 by James Kirkham
Snow dynamics play a crucial role in the hydrology of alpine catchments in the Himalaya. However, studies based on in-situ observations that elucidate the energy and mass balance of the…1 March, 2021 by Alex Brisbourne, Sofia-Katerina Kufner, Thomas Hudson, Thomas Hudson
Seismic arrays deployed using DAS generally suffer from a poorer SNR than those using conventional seismometers or geophones, however their high spatial resolution provides opportunities to supress noise and enhance…1 March, 2021 by Alex Brisbourne, Sofia-Katerina Kufner, Thomas Hudson, Thomas Hudson
Here, we present the first results of DAS deployed in Antarctica to interrogate icequake microseismicity. Distributed Acoustic Sensing (DAS) can provide much higher density spatial sampling of an earthquake’s seismic…1 March, 2021 by Alex Brisbourne, Andy Smith, Sofia-Katerina Kufner, Thomas Hudson, Thomas Hudson
The use of fibre as a Distributed Acoustic Sensor (DAS) is a recently developed technology with enormous potential, and, until recently, never tested in Antarctica. Here we show how DAS…Read more on Listening to Ice Sheets – Fibre Optic Cables as Seismic Sensors in the Antarctic
1 March, 2021 by Simon Morley
Extrapolating patterns from individuals to populations informs climate vulnerability models, yet biological responses to warming are uncertain at both levels. Here we contrast data on the heating tolerances of fishes…Read more on Fish heating tolerance scales similarly across individual physiology and populations
1 March, 2021 by Dennis Mayk
A sphere might be the most common crystal habit in nature as it exists in a wide range of organic and inorganic material systems (Shtukenberg et al., 2012). These crystal…Read more on Transitional spherulitic layer in the muricid Nucella lapillus
27 February, 2021 by Amelie Kirchgaessner, John King
Föhn winds are warm, strong, downslope winds on the lee side of mountains, which can last from several hours to a few days. Recently Föhn conditions over the ice shelves…25 February, 2021 by Jaume Forcada
The Antarctic fur seal lives south of the Antarctic Polar Front and has never been reported breeding in Latin America. Individuals encountered occasionally, from Peru, norther Chile, and the Juan…Read more on Antarctic Fur Seal (Arctocephalus gazella, Peters 1875).
25 February, 2021 by Mark Clilverd
The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and the lower part of the ionosphere and as such comprises a complex system coupled to both the atmosphere below and…
23 February, 2021 by Adrian Jenkins, Christopher Bull, Irena Vankova, Paul Holland
Recent work on the Filchner‐Ronne Ice Shelf (FRIS) system has shown that a redirection of the coastal current in the southeastern Weddell Sea could lead to a regime change in…Read more on Remote control of Filchner‐Ronne Ice Shelf melt rates by the Antarctic Slope Current
23 February, 2021 by Pierre Dutrieux
The Getz region of West Antarctica is losing ice at an increasing rate; however, the forcing mechanisms remain unclear. Here we use satellite observations and an ice sheet model to…23 February, 2021 by Richard Phillips
Climate change, fisheries and invasive species represent three pervasive threats to seabirds, globally. Understanding the relative influence and compounding nature of marine and terrestrial threats on the demography of seabird…23 February, 2021 by Hugh Venables, Michael Meredith
The relative flow of carbon through the viral shunt and the microbial loop is a pivotal factor controlling the contribution of secondary production to the food web and to rates…23 February, 2021 by Huw Griffiths
Research vessels equipped with fibre optic and copper-cored coaxial cables support the live onboard inspection of high-bandwidth marine data in real time. This allows for towed still-image and video sleds…
22 February, 2021 by Richard Phillips
Background Inertial measurement units (IMUs) with high-resolution sensors such as accelerometers are now used extensively to study fine-scale behavior in a wide range of marine and terrestrial animals. Robust and…20 February, 2021 by Michael Collins, Melody Clark
The adaptive value of phenotypic plasticity for performance under single stressors is well documented. However, plasticity may only truly be adaptive in the natural multifactorial environment if it confers resilience…Read more on Transcriptional frontloading contributes to cross‐tolerance between stressors
18 February, 2021 by Cecilia Liszka, Clara Manno, Geraint Tarling, Gabriele Stowasser
Diel vertical migration is a widespread behaviour amongst zooplankton, yet its effect on the rate at which individuals respire remains poorly understood. To address this, we investigated the effect of…
17 February, 2021 by Peter Convey
Bioremediation of hydrocarbons has received much attention in recent decades, particularly relating to fuel and other oils. While of great relevance globally, there has recently been increasing interest in hydrocarbon…17 February, 2021 by Louis-Alexandre Couston
Trapped beneath the Antarctic ice sheet lie over 400 subglacial lakes, which are considered to be extreme, isolated, yet viable habitats for microbial life. The physical conditions within subglacial lakes…Read more on Dynamic flows create potentially habitable conditions in Antarctic subglacial lakes
17 February, 2021 by Lily Bentley, Richard Phillips
Diving is an ecologically important behaviour that provides air-breathing predators with opportunities to capture prey, but that also increases their exposure to incidental mortality (bycatch) in commercial fisheries. In this…
17 February, 2021 by Lily Bentley, Richard Phillips
Diving is an ecologically important behaviour that provides air-breathing predators with opportunities to capture prey, but that also increases their exposure to incidental mortality (bycatch) in commercial fisheries. In this…
16 February, 2021
Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere‐ionosphere eXtension simulations are used to investigate the solar migrating semidiurnal tide (SW2) around September equinox at middle to high latitudes in…16 February, 2021 by David Barnes, Samuel Hall, Simon Morley
Environmental conditions of the Southern Ocean around Antarctica have varied little for >5 million years but are now changing. Here we investigated how warming affects competition for space. Little considered…16 February, 2021 by David Barnes, Lloyd Peck, Simon Morley
Environmental conditions of the Southern Ocean around Antarctica have varied little for >5 million years but are now changing. Here we investigated how warming affects competition for space. Little considered…
15 February, 2021 by Huw Griffiths, James Smith, Katrin Linse, Paul Anker
The seafloor beneath floating ice shelves accounts roughly a third of the Antarctic’s 5 million km2 of continental shelf. Prior to this study, our knowledge of these habitats and the…12 February, 2021 by Louis-Alexandre Couston
Iceberg meltwater is a critical freshwater flux from the cryosphere to the oceans. Global climate simulations therefore require simple and accurate parametrizations of iceberg melting. Iceberg shape is an important…
11 February, 2021 by Richard Phillips, William Mills
Northern Macronectes halli and southern giant petrels M. giganteus are opportunistic predators and the dominant avian scavengers in sub-Antarctic and Antarctic ecosystems. At South Georgia, there are globally important breeding…Read more on Long-term inter- and intraspecific dietary variation in sibling seabird species
9 February, 2021 by Lara Perez Miguel, Victoria Peck
International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea's “Iceberg Alley” recovered among the most continuous and highest resolution stratigraphic records in the Southern Ocean near Antarctica spanning…7 February, 2021 by Dani Jones
Dotson Ice Shelf (DIS) in West Antarctica is undergoing rapid basal melting driven by intrusions of warm, saline Circumpolar Deep Water (CDW) onto the continental shelf. Meltwater from DIS is…
4 February, 2021 by Thomas Bauska
During the last glacial period, atmospheric carbon dioxide (CO2) closely followed Antarctic temperature on millennial timescales. This strong correlation between Antarctic climate and atmospheric CO2 has led to suggestions that…Read more on Abrupt changes in the global carbon cycle during the last glacial period
4 February, 2021
Cephalopods play a major role in marine ecosystems, yet very little is known about the dynamics of their habitat use and trophic ecology across the stages of their life cycle,…
3 February, 2021 by Peter Convey
Collembola are a key component of the soil biota globally, playing an important role in community and ecosystem dynamics. Equally significant are their associated microbiomes, that can contribute to key…
3 February, 2021 by Gaelle Veyssiere, Jeremy Wilkinson
Arctic sea ice is shifting from a year-round to a seasonal sea ice cover. This substantial transformation, via a reduction in Arctic sea ice extent and a thinning of its…
2 February, 2021 by David Barnes, Martin Collins, Simon Morley
Bluenose warehou (Hyperoglyphe antarctica) is a popular commercial fish in Australia and New Zealand, but its biology and ecology are very poorly known in other regions where it is found.…
1 February, 2021 by Peter Convey
Assessment of the diversity of algal assemblages in Antarctica has until now largely relied on traditional microbiological culture approaches. Here we used DNA metabarcoding through high-throughput sequencing (HTS) to assess…
1 February, 2021 by David Pearce
The Tibetan Plateau, also termed ‘the Third Pole’ harbors the largest number of high-altitude lakes in the world. Due to the presence of extreme conditions such as low temperature and…Read more on Bacteria in the lakes of the Tibetan Plateau and polar regions
1 February, 2021 by Kevin Hughes, Peter Convey
The flightless midge Eretmoptera murphyi is thought to be continuing its invasion of Signy Island via the treads of personnel boots. Current boot-wash biosecurity protocols in the Antarctic region rely…
1 February, 2021 by Jane Francis
Paleocene leaf floras are rare in high latitudes of the Southern Hemisphere, where studies have shown higher taxonomic diversity compared to Northern Hemisphere equivalents. The floras provide valuable insights into…Read more on Paleocene high-latitude leaf flora of Antarctica Part 1: Entire-margined angiosperms
1 February, 2021 by Jane Francis
Carbon and oxygen isotopes (δ13C and δ18O) in tree rings are widely used to reconstruct palaeoclimate variables such as temperature during the Holocene (12 thousand years ago - present), and…
1 February, 2021 by Clara Manno, Emily Rowlands
Polar marine ecosystems may have higher sensitivity than other ecosystems to plastic pollution due to recurrent physical and biological features; presence of ice and high UV radiation, slow growth rates…
1 February, 2021 by Richard Phillips
1. As temperatures rise, timing of reproduction is changing at different rates across trophic levels, potentially resulting in asynchrony between consumers and their resources. The match‐mismatch hypothesis (MMH) suggests that…
1 February, 2021 by Martin Collins
Yellowfin tuna are the mainstay of the traditional tuna fisheries in St Helena waters, but there is limited knowledge of their ecology and feeding behaviour in the area. In this…
1 February, 2021 by Gareth Marshall
The Arctic continues to warm at a much faster rate than the global average. One process contributing to ‘Arctic amplification’ involves changes in low-frequency macro-scale atmospheric circulation patterns and their…
1 February, 2021 by Martin Collins, Ryan Saunders
Fish morphometric relationships are key tools for fisheries science and studies of food web dynamics and predator foraging behaviour, but parameterisations are limited for Southern Ocean myctophids (Family Myctophidae). New…1 February, 2021 by Chester Sands
Species inventories are essential to the implementation of conservation policies to mitigate biodiversity loss and maintain ecosystem services and their value to the society. This is particularly topical with respect…
1 February, 2021 by Lloyd Peck, Luca Telesca
Accurate biological models are critical to predict biotic responses to climate change and human‐caused disturbances. Current understanding of organismal responses to change stems from studies over relatively short timescales. However,…
1 February, 2021 by Christian Buckingham
In this study, we examine the role of curvature in modifying frontal stability. We first evaluate the classical criterion that the Coriolis parameter, f, multiplied by the Ertel potential vorticity…
1 February, 2021 by Christian Buckingham
We continue our study of the role of curvature in modifying frontal stability. In Part 1, we obtained an instability criterion valid for curved fronts and vortices in gradient wind…
1 February, 2021
Interplanetary human missions to Mars and beyond will suppose a very demanding physical and psychological environment for future astronauts. Isolation, confinement, hypoxia or hypercapnia in a less pressurized atmosphere, darkness…
1 February, 2021 by Michael Rose
Year-round monitoring of Erebus volcano (Ross Island) has proved challenging due to the difficulties of maintaining continuous power for scientific instruments, especially through the Antarctic winter. We sought a potential…Read more on Harnessing Erebus volcano’s thermal energy to power year-round monitoring
1 February, 2021 by Leo Middleton, Paul Holland
The transport of heat and salt through turbulent ice shelf-ocean boundary layers is a large source of uncertainty within ocean models of ice shelf cavities. This study uses small-scale, high…
1 February, 2021 by Hannah Cubaynes, Penny Clarke
The emergence of very high-resolution (VHR) satellite imagery (less than 1 m spatial resolution) is creating new opportunities within the fields of ecology and conservation biology. The advancement of sub-meter…Read more on The potential of satellite imagery for surveying whales
1 February, 2021 by Adrian Jenkins, Louis-Alexandre Couston, Paul Holland
We report an idealized numerical study of a melting and freezing solid adjacent to a turbulent, buoyancy-affected shear flow, in order to improve our understanding of topography generation by phase…Read more on Topography generation by melting and freezing in a turbulent shear flow.
1 February, 2021
Behavioral mechanisms for avoiding inbreeding are common in the natural world and are believed to have evolved as a response to the negative consequences of inbreeding. However, despite a fundamental…29 January, 2021 by Huw Griffiths
Understanding the vulnerability of marine calcifiers to ocean acidification is a critical issue, especially in the Southern Ocean (SO), which is likely to be the one of the first, and…28 January, 2021 by Huw Griffiths, Katrin Linse, Rowan Whittle
Habitat heterogeneity is important for maintaining high levels of benthic biodiversity. The Prince Gustav Channel, on the Eastern Antarctic Peninsula, is characterized by an array of habitat types, ranging from…
26 January, 2021 by Kevin Newsham
We report a metabarcoding study documenting the fungal taxa in 29 barren fellfield soils sampled from along a 1,650 km transect encompassing almost the entire maritime Antarctic (60–72°S) and the…25 January, 2021 by Joseph Ulanowski
We report on the electric field variations during Saharan dust advection over two atmospheric remote stations in Greece, using synergistic observations of the vertical atmospheric electric field strength (Ez) at…
21 January, 2021
Understanding the underlying ecological factors that affect the distribution patterns of organisms is vital for their conservation. Cephalopods such as giant warty squids Moroteuthopsis longimana are important in the diets…20 January, 2021 by Philip Trathan, Victoria Warwick-Evans
Global targets for area-based conservation and management must move beyond threshold-based targets alone and must account for the quality of such areas. In the Southern Ocean around Antarctica, a region…
19 January, 2021 by Anne Flink
The submarine landforms and shallow sediment record are presented from Hambergbukta, southeastern Spitsbergen using swath‐bathymetric, subbottom acoustic, and sediment core data. The mapped landforms include large terminal and end‐moraines with…
19 January, 2021 by Huw Griffiths
Whilst both plastic production and inputs at sea have increased since the 1950s, several modelling studies predict a further increase in the coming years in these respective quantities. We compiled…Read more on Are litter, plastic and microplastic quantities increasing in the ocean?