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When glaciers calve: Large underwater tsunamis discovered at edge of Antarctica, likely affecting ice melt, climate and marine ecosystem

14 July, 2024 by Michael Meredith

The mixing of water in the ocean is a key influence on our climate and ecosystems, but its importance is often under-recognized. Mixing in the seas around Antarctica—a key process…

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Ancient diversification in extreme environments: Exploring the historical biogeography of the Antarctic winged midge Parochlus steinenii (Diptera: Chironomidae)

11 July, 2024 by Chester Sands, Felipe Simoes, Peter Convey

The terrestrial fauna of Antarctica consists of a limited number of species, notably insects, small crustaceans and other micro-invertebrates. Over long periods of evolutionary isolation, these organisms have developed varying…

Read more on Ancient diversification in extreme environments: Exploring the historical biogeography of the Antarctic winged midge Parochlus steinenii (Diptera: Chironomidae)

Improved Energy Resolution Measurements of Electron Precipitation Observed During an IPDP‐Type EMIC Event

9 July, 2024 by Aaron Hendry, Alexander Lozinski, Mark Clilverd

High energy resolution DEMETER satellite observations from the Instrument for the Detection of Particle (IDP) are analyzed during an electromagnetic ion cyclotron (EMIC)-induced electron precipitation event. Analysis of an Interval…

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Fungal and fungal-like diversity present in ornithogenically influenced maritime Antarctic soils assessed using metabarcoding

2 July, 2024 by Peter Convey

We assessed soil fungal and fungal-like diversity using metabarcoding in ornithogenically influenced soils around nests of the bird species Phalacrocorax atriceps, Macronectes giganteus, Pygoscelis antarcticus, and Pygoscelis adelie on the…

Read more on Fungal and fungal-like diversity present in ornithogenically influenced maritime Antarctic soils assessed using metabarcoding

Network analyses on photographic surveys reveal that invertebrate predators do not structure epibenthos in the deep (~2000m) rocky Powell Basin, Weddell Sea, Antarctica

2 July, 2024 by Huw Griffiths, Rowan Whittle, Tasnuva Khan

Predator-prey interactions in marine ecosystems control population sizes, maintain species richness, and provide intermediate disturbance. Such ecosystem structuring interactions may be rare in Antarctic epibenthic communities, which are unique among…

Read more on Network analyses on photographic surveys reveal that invertebrate predators do not structure epibenthos in the deep (~2000m) rocky Powell Basin, Weddell Sea, Antarctica

At‑sea distribution of marine predators around South Georgia during austral winter, with implications for fisheries management

1 July, 2024 by Alastair Wilson, Claire Waluda, Kate Owen, Martin Collins, Meghan Goggins, Philip Hollyman, Philip Trathan

The sub-Antarctic island of South Georgia is surrounded by highly productive waters, supporting dense aggregations of Antarctic krill (Euphausia superba), a vital food source for globally important seabird and marine…

Read more on At‑sea distribution of marine predators around South Georgia during austral winter, with implications for fisheries management

Ocean warming and acidification adjust inter- and intra-specific variability in the functional trait expression of polar invertebrates

1 July, 2024 by Lloyd Peck

Climate change is known to affect the distribution and composition of species, but concomitant alterations to functionally important aspects of behaviour and species-environment relations are poorly constrained. Here, we examine…

Read more on Ocean warming and acidification adjust inter- and intra-specific variability in the functional trait expression of polar invertebrates

The Impact of CO2 and Climate State on Whether Dansgaard–Oeschger Type Oscillations Occur in Climate Models

29 June, 2024 by Irene Malmierca Vallet, John Slattery, Louise Sime

Greenland ice core records feature Dansgaard–Oeschger (D-O) events, which are abrupt warming episodes followed by gradual cooling during ice age climate. The three climate models used in this study (CCSM4,…

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Life-history stage influences immune investment and oxidative stress in response to environmental heterogeneity in Antarctic fur seals

29 June, 2024 by Cameron Fox-Clarke, Camille Toscani, Claire Stainfield, Jaume Forcada

Immune defenses are crucial for survival but costly to develop and maintain. Increased immune investment is therefore hypothesized to trade-off with other life-history traits. Here, we examined innate and adaptive…

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Twenty‐thousand‐year gap between deglaciation and peat formation on sub‐Antarctic Marion Island attributed to climate and sea level change

28 June, 2024 by Alexander Whittle, Dominic Hodgson

Radiocarbon dating of basal peats has been a key factor in determining minimum ages for deglaciation on sub-Antarctic islands. On Marion Island, peat bogs dominate the landscape below 300 m a.s.l.,…

Read more on Twenty‐thousand‐year gap between deglaciation and peat formation on sub‐Antarctic Marion Island attributed to climate and sea level change

Enzymes and biosurfactants of industrial interest produced by culturable fungi present in sediments of Boeckella Lake, Hope Bay, north‑east Antarctic Peninsula

22 June, 2024 by Peter Convey

This study characterized cultivable fungi present in sediments obtained from Boeckella Lake, Hope Bay, in the north-east of the Antarctic Peninsula, and evaluated their production of enzymes and biosurfactants of…

Read more on Enzymes and biosurfactants of industrial interest produced by culturable fungi present in sediments of Boeckella Lake, Hope Bay, north‑east Antarctic Peninsula

The importance of cloud properties when assessing surface melting in an offline-coupled firn model over Ross Ice shelf, West Antarctica

21 June, 2024 by Andrew Orr, Ella Gilbert, Ruth Price, Thomas Bracegirdle, Tony Phillips

The Ross Ice Shelf, West Antarctica, experienced an extensive melt event in January 2016. We examine the representation of this event by the HIRHAM5 and MetUM high-resolution regional atmospheric models,…

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Steppe-tundra composition and deglacial floristic turnover in interior Alaska revealed by sedimentary ancient DNA (sedaDNA)

15 June, 2024 by Alistair Monteath

When tracing vegetation dynamics over long timescales, obtaining enough floristic information to gain a detailed understanding of past communities and their transitions can be challenging. The first high-resolution sedimentary DNA…

Read more on Steppe-tundra composition and deglacial floristic turnover in interior Alaska revealed by sedimentary ancient DNA (sedaDNA)

A New Model of Electron Pitch Angle Distributions and Loss Timescales in the Earth’s Radiation Belts

8 June, 2024 by Jack Atkinson, Johnathan Ross, Richard Horne, Sarah Glauert

As the number of satellites on orbit grows it is increasingly important to understand their operating environment. Physics-based models can simulate the behavior of the Earth's radiation belts by solving…

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A large-scale transcontinental river system crossed West Antarctica during the Eocene

5 June, 2024 by Claus-Dieter Hillenbrand, Robert Larter

Extensive ice coverage largely prevents investigations of Antarctica’s unglaciated past. Knowledge about environmental and tectonic development before large-scale glaciation, however, is important for understanding the transition into the modern icehouse…

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Coupled ice–ocean interactions during future retreat of West Antarctic ice streams in the Amundsen Sea sector

3 June, 2024 by Alexander Bradley, Rosie Williams, David Bett, Paul Holland, Robert Arthern

The Amundsen Sea sector has some of the fastest-thinning ice shelves in Antarctica, caused by high, ocean-driven basal melt rates, which can lead to increased ice streamflow, causing increased sea…

Read more on Coupled ice–ocean interactions during future retreat of West Antarctic ice streams in the Amundsen Sea sector

A comparison of two statistical postprocessing methods for heavy‐precipitation forecasts over India during the summer monsoon

3 June, 2024 by Andrew Orr

Accurate ensemble forecasts of heavy precipitation in India are vital for many applications and essential for early warning of damaging flood events, especially during the monsoon season. In this study…

Read more on A comparison of two statistical postprocessing methods for heavy‐precipitation forecasts over India during the summer monsoon

Top predator feeding ecology and microplastic (MP) contamination on the far eastern South American coast: Evidence of MP trophic biotransfer

1 June, 2024 by Simon Morley

This study describes the feeding ecology, spatial distribution of each ontogenetic phase and the corresponding plastic debris contamination, in the Caribbean sharpnose shark, Rhizoprionodon porosus as a function of spatial-temporal…

Read more on Top predator feeding ecology and microplastic (MP) contamination on the far eastern South American coast: Evidence of MP trophic biotransfer

Pathogenic potential of an environmental Aspergillus fumigatus strain recovered from soil of Pygoscelis papua (Gentoo Penguins) colony in Antarctica

1 June, 2024 by Peter Convey

Aspergillus fumigatus is a common opportunistic pathogen in different animals, including birds such as penguins. For the first time, a fungal strain identified as A. fumigatus was isolated from soil…

Read more on Pathogenic potential of an environmental Aspergillus fumigatus strain recovered from soil of Pygoscelis papua (Gentoo Penguins) colony in Antarctica

Simultaneous organic aerosol source apportionment at two Antarctic sites reveals large-scale and eco-region specific components

29 May, 2024 by Anna Jones, Thomas Lachlan-Cope

Antarctica and the Southern Ocean are the most pristine areas of the globe and represent ideal places to investigate aerosol-climate interactions in an unperturbed atmosphere. In this study, we present…

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Surface snow bromide and nitrate at Eureka, Canada in early spring and implications for polar boundary layer chemistry

23 May, 2024 by Xin Yang

This study explores the role of snowpack in polar boundary layer chemistry, especially as a direct source of reactive bromine (BrOx = BrO + Br) and nitrogen (NOx = NO + NO2) in the Arctic springtime. Surface snow…

Read more on Surface snow bromide and nitrate at Eureka, Canada in early spring and implications for polar boundary layer chemistry

Walruses from space: walrus counts in simultaneous remotely piloted aircraft system versus very high-resolution satellite imagery

21 May, 2024 by Hannah Cubaynes, Jaume Forcada, Peter Fretwell

Regular counts of walruses (Odobenus rosmarus) across their pan-Arctic range are necessary to determine accurate population trends and in turn understand how current rapid changes in their habitat, such as…

Read more on Walruses from space: walrus counts in simultaneous remotely piloted aircraft system versus very high-resolution satellite imagery

Mercury Concentrations in Feathers of Albatrosses and Large Petrels at South Georgia: Contemporary Patterns and Comparisons with Past Decades

18 May, 2024 by Richard Phillips, William Mills

Mercury (Hg) is an environmental contaminant that can negatively impact the health of humans and wildlife. Albatrosses and large petrels show some of the highest levels of Hg contamination among…

Read more on Mercury Concentrations in Feathers of Albatrosses and Large Petrels at South Georgia: Contemporary Patterns and Comparisons with Past Decades

Overview, Progress and Next Steps for Our Understanding of the Near-Earth Space Radiation and Plasma Environment: Science and Applications

15 May, 2024 by Richard Horne, Sarah Glauert

The Near-Earth Space Radiation and Plasma Environment falls within the realm of G3 Cluster (G3 refers to ‘Near-Earth Radiation and Plasma Environment’ of the ‘Coupled Geospace System’) under the COSPAR…

Read more on Overview, Progress and Next Steps for Our Understanding of the Near-Earth Space Radiation and Plasma Environment: Science and Applications

Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses [in review]

7 May, 2024 by Louise Sime, Qinggang Gao, Rahul Sivankutty, Xu Zhang

Given relatively abundant paleo proxies, the study of the Last Interglacial (LIG, ~129-116 thousand years ago, ka) is valuable to understanding natural variability and feedback in a warmer-than-preindustrial climate. The…

Read more on Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses [in review]

When ice and sea are not barriers for flies: First report of Trichocera maculipennis (Diptera) in South America

1 May, 2024 by Peter Convey

1. During the 2022/2023 austral winter, large swarms of Trichocera (Saltrichocera) maculipennis Meigen, 1818 (Diptera: Trichoceridae), were observed around house roofs in Puerto Williams (Navarino Island, southern Chile, 54° S). In…

Read more on When ice and sea are not barriers for flies: First report of Trichocera maculipennis (Diptera) in South America

Updating requirements for Endangered, Threatened and Protected species MSC Fisheries Standard v3.0 to operationalise best practices

1 May, 2024 by Richard Phillips

Bycatch in fisheries is a key threat to non-target marine species, particularly for those species that have life histories with low productivity or poor conservation status. In this paper, the…

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Adapting the Marine Stewardship Council risk-based framework to estimate impacts on seabirds, marine mammals, marine turtles and sea snakes

1 May, 2024 by Richard Phillips

Information available on impacts of fisheries on target or bycatch species varies greatly, requiring development of risk assessment tools to determine potentially unacceptable levels. Seabirds, marine mammals, marine turtles and…

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Biogeographical and seasonal distribution of pteropod populations in the Western and Central Mediterranean Sea inferred from sediment traps

26 April, 2024 by Clara Manno

Pteropods are a group of cosmopolitan holoplanktic gastropods that produce an aragonite shell and play an important role in both marine ecosystems and geochemical cycles. In addition to being affected…

Read more on Biogeographical and seasonal distribution of pteropod populations in the Western and Central Mediterranean Sea inferred from sediment traps

The genome sequence of the marbled rockcod, Notothenia rossii Richardson, 1844 [Data Note] [version 1; peer review: 2 approved, 1 approved with reservations]

24 April, 2024 by Martin Collins

We present a genome assembly from an individual Notothenia rossii (the marbled rockcod; Chordata; Actinopterygii; Perciformes; Nototheniidae). The genome sequence is 1,042.9 megabases in span. Most of the assembly is…

Read more on The genome sequence of the marbled rockcod, Notothenia rossii Richardson, 1844 [Data Note] [version 1; peer review: 2 approved, 1 approved with reservations]

Long‐Term Variability and Tendencies in Mesosphere and Lower Thermosphere Winds From Meteor Radar Observations Over Esrange (67.9°N, 21.1°E)

16 April, 2024 by Ramesh Karanam, Tracy Moffat-Griffin

Long-term variabilities of monthly zonal (U) and meridional winds (V) in northern polar mesosphere and lower thermosphere (MLT, ∼80–100 km) are investigated using meteor radar observations during 1999–2022 over Esrange…

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Unexpectedly uneven distribution of functional trade-offs explains cranial morphological diversity in carnivores

16 April, 2024 by Marie Attard

Functional trade-offs can affect patterns of morphological and ecological evolution as well as the magnitude of morphological changes through evolutionary time. Using morpho-functional landscape modelling on the cranium of 132…

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The genome sequence of the limp eelpout, Melanostigma gelatinosum Günther, 1881 [Data Note] [version 1; peer review: 1 approved with reservations]

12 April, 2024 by Martin Collins

We present a genome assembly from a Melanostigma gelatinosum (the limp eelpout; Chordata; Actinopterygii; Perciformes; Zoarcidae). The genome sequence is 662.0 megabases in span. Most of the assembly is scaffolded…

Read more on The genome sequence of the limp eelpout, Melanostigma gelatinosum Günther, 1881 [Data Note] [version 1; peer review: 1 approved with reservations]