Ross Sea Benthic Ecosystems: Macro- and Mega-faunal Community Patterns From a Multi-environment Survey DOI Creative Commons
Vonda J. Cummings, David A. Bowden, Matthew H. Pinkerton

et al.

Frontiers in Marine Science, Journal Year: 2021, Volume and Issue: 8

Published: April 6, 2021

The Ross Sea, Antarctica, is amongst the least human-impacted marine environments, and site of world’s largest Marine Protected Area. We present research on two components Sea benthic fauna: mega-epifauna, macro-infauna, sampled using video multicore, respectively, continental shelf in previously unsampled habitats northern slope abyssal plain. describe physical habitat characteristics community composition, terms faunal diversity, abundance, functional traits, compare similarities within between habitats. also examine relationships distributions ice cover productivity, summaries satellite-derived data over decade prior to our sampling. Clear differences seafloor communities were noted environments. Seafloor substrates more diverse Slope Abyss, while taxa generally Shelf. Mega-epifauna predominantly suspension feeders across Shelf Slope, with deposit feeder-grazers found higher or equal abundances Abyss. In contrast, common macro-infaunal feeding type Slope. Concordance mega-epifauna macro-infauna suggests that non-destructive sampling can be used indicate likely composition at larger spatial scales, least. Primary seabed organic flux, sea concentrations, their variability time, important structuring factors for both types. This illustrates importance better understanding bentho-pelagic coupling incorporating this biogeographic process-distribution models, enable meaningful predictions how these ecosystems may impacted by projected environmental changes. study has enhanced functions fauna inside outside MPA boundaries, expanding baseline dataset against which success MPA, as well change evaluated longer term.

Language: Английский

Polar Regions DOI Open Access
Andrew Constable, Jackie Dawson, Kirstin K. Holsman

et al.

Cambridge University Press eBooks, Journal Year: 2023, Volume and Issue: unknown, P. 2319 - 2368

Published: June 22, 2023

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Language: Английский

Citations

62
Biogeographic survey of soil bacterial communities across Antarctica DOI Creative Commons
Gilda Varliero, Pedro H. Lebre, Byron J. Adams

et al.

Microbiome, Journal Year: 2024, Volume and Issue: 12(1)

Published: Jan. 12, 2024

Abstract Background Antarctica and its unique biodiversity are increasingly at risk from the effects of global climate change other human influences. A significant recent element underpinning strategies for Antarctic conservation has been development a system Conservation Biogeographic Regions (ACBRs). The datasets supporting this classification are, however, dominated by eukaryotic taxa, with contributions bacterial domain restricted to Actinomycetota Cyanobacteriota. Nevertheless, ice-free areas continent sub-Antarctic islands in terms diversity bacteria. Our study aims generate comprehensive phylogenetic dataset bacteria wide geographical coverage on islands, investigate whether distribution is reflected current ACBRs. Results Soil community composition did not fully conform ACBR classification. Although 19% variability was explained classification, largest differences were between broader continental maritime regions, where degree structural overlapping within communities apparent, reflecting division into separate Strong divergence soil also apparent Antarctic/sub-Antarctic mainland. Bacterial partially shaped bioclimatic conditions, 28% dominant genera showing habitat preferences connected least one variables included our analyses. These reported as indicator taxa Conclusions Overall, data indicate that subdivision does reflect Antarctica. We observed considerable overlap structure region region. results suggest might be impacted regional climatic environmental changes. developed provides baseline will provide valuable tool efforts continent. Further studies clearly required, we emphasize need more extensive campaigns systematically sample characterize microbial communities.

Language: Английский

Citations

19
Acceleration of climate warming and plant dynamics in Antarctica DOI Creative Commons
Nicoletta Cannone, Francesco Malfasi, Sergio E. Favero‐Longo

et al.

Current Biology, Journal Year: 2022, Volume and Issue: 32(7), P. 1599 - 1606.e2

Published: Feb. 14, 2022

Language: Английский

Citations

54
Comprehensive insights on environmental adaptation strategies in Antarctic bacteria and biotechnological applications of cold adapted molecules DOI Creative Commons
Kesava Priyan Ramasamy, Lovely Mahawar, Raju Rajasabapathy

et al.

Frontiers in Microbiology, Journal Year: 2023, Volume and Issue: 14

Published: June 16, 2023

Climate change and the induced environmental disturbances is one of major threats that have a strong impact on bacterial communities in Antarctic environment. To cope with persistent extreme environment inhospitable conditions, psychrophilic bacteria are thriving displaying striking adaptive characteristics towards severe external factors including freezing temperature, sea ice, high radiation salinity which indicates their potential regulating climate change’s impacts. The review illustrates different adaptation strategies microbes to changing at structural, physiological molecular level. Moreover, we discuss recent developments “omics” approaches reveal polar “blackbox” psychrophiles order gain comprehensive picture communities. synthesize distinctive cold-adapted enzymes molecules many more industrial applications than mesophilic ones biotechnological industries. Hence, also emphasizes sectors suggests machine learning approach study cold–adapted engineering industrially important for sustainable bioeconomy.

Language: Английский

Citations

29
Mercury biomagnification in an Antarctic food web of the Antarctic Peninsula DOI
Ricardo S. Matias, Hugo R. Guímaro, Paco Bustamante

et al.

Environmental Pollution, Journal Year: 2022, Volume and Issue: 304, P. 119199 - 119199

Published: March 22, 2022

Language: Английский

Citations

31
Anthropogenic debris in three sympatric seal species of the Western Antarctic Peninsula DOI
Julieta Denise Cebuhar, Javier Negrete,

Lucas S. Rodríguez Pirani

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 922, P. 171273 - 171273

Published: Feb. 24, 2024

Language: Английский

Citations

8
New insights into the Weddell Sea ecosystem applying a quantitative network approach DOI Creative Commons
Tomás I. Marina, Leonardo Saravia, Susanne Kortsch

et al.

Ocean science, Journal Year: 2024, Volume and Issue: 20(1), P. 141 - 153

Published: Feb. 5, 2024

Abstract. Network approaches can shed light on the structure and stability of complex marine communities. In recent years, such have been successfully applied to study polar ecosystems, improving our knowledge how they might respond ongoing environmental changes. The Weddell Sea is one most studied ecosystems outside Antarctic Peninsula in Southern Ocean. Yet, few studies consider known complexity food web, which its current form comprises 490 species 16 041 predator–prey interactions. Here we analysed focusing trophic interactions that underpin ecosystem stability. We estimated strength for each interaction characterised position web using unweighted weighted properties, species' roles with respect web. found distribution (IS) at level asymmetric, many weak strong ones. detected a positive relationship between median IS two properties (i.e. total number interactions). also only possess key positions terms These are by high IS, middle level, relatively interactions, low similarity. this study, integrated information, enabling more complete assessment function Our results provide new insights, important development effective policies management strategies, particularly given initiative implement protected area (MPA) Sea.

Language: Английский

Citations

7
Estimating the Impact of Biodiversity Loss in a Marine Antarctic Food Web DOI Creative Commons
Vanesa Salinas, Georgina Cordone, Tomás I. Marina

et al.

Diversity, Journal Year: 2024, Volume and Issue: 16(1), P. 63 - 63

Published: Jan. 18, 2024

The consequences of climate change and anthropogenic stressors, such as habitat loss overexploitation, are threatening the subsistence species communities across planet. Therefore, it is crucial that we analyze impact environmental perturbations on diversity, structure function ecosystems. In this study, in silico simulations biodiversity were carried out marine food web Caleta Potter (25 de Mayo/King George Island, Antarctica), where global warming has caused critical changes abundance distribution benthic pelagic over last 30 years. We performed removal, considering their degree trophic level, including four different thresholds occurrence secondary extinctions. examined extinctions connectance, modularity stability web. found responses for these properties depending extinction criteria used, e.g., large increase rapid decrease when most connected relatively high-trophic-level removed. Additionally, studied complexity–stability relationship web, two regimes: (1) high sensitivity to small perturbations, suggesting Cove would be locally unstable, (2) persistence long-range ecosystem.

Language: Английский

Citations

6
Responses of Southern Ocean Seafloor Habitats and Communities to Global and Local Drivers of Change DOI Creative Commons
M Brasier, David K. A. Barnes, Narissa Bax

et al.

Frontiers in Marine Science, Journal Year: 2021, Volume and Issue: 8

Published: May 13, 2021

Knowledge of life on the Southern Ocean seafloor has substantially grown since beginning this century with increasing ship-based surveys and regular monitoring sites, new technologies greatly enhanced data sharing. However, habitats their communities exhibit high spatial variability heterogeneity that challenges way in which we assess state benthos larger scales. The Antarctic shelf is rich diversity compared deeper water areas, important for storing carbon (“blue carbon”) provides habitat commercial fish species. In paper, focus shelf, are vulnerable to drivers change including ocean temperatures, iceberg scour, sea ice melt, acidification, fishing pressures, pollution non-indigenous Some most areas include West Peninsula, experiencing rapid regional warming increased iceberg-scouring, subantarctic islands tourist destinations where human activities environmental conditions increase potential establishment species active around South Georgia, Heard MacDonald Islands. Vulnerable those low thermal tolerance, calcifying susceptible acidity as well slow-growing habitat-forming can be damaged by gears e.g., sponges, bryozoan, coral Management regimes protect key from activities; some will need more protection than others, accounting specific traits make vulnerable, slow growing long-lived species, restricted locations optimum physiological available food, distributions rare Ecosystem-based management practices long-term, highly protected may effective tools preservation habitats. Here, outlining responses observed date projections future. We discuss action preserve under climate change, pressures other anthropogenic impacts.

Language: Английский

Citations

39
Modelling suspended particulate matter dynamics at an Antarctic fjord impacted by glacier melt DOI Creative Commons
Camila Neder,

Vera Fofonova,

Alexey Androsov

et al.

Journal of Marine Systems, Journal Year: 2022, Volume and Issue: 231, P. 103734 - 103734

Published: March 22, 2022

When Antarctic glaciers retreat, high sediment loads from geomorphological and glaciological sources can disturb the biota, especially filtering organisms, thereby significantly alter ecology of coast. We applied Finite volumE Sea-ice Ocean-Coastal Model (FESOM-C), a numerical tool equipped with module, to simulate for first time suspended particulate matter (SPM) dynamics in fjordic environment at northern West Peninsula, Potter Cove as case study. Depth-averaged SPM during meteorologically representative austral summer (120 days December March) considered tidal atmospheric forcing. Additionally, idealised experiments passive particles based on post-processing Lagrangian module identified followed possible material trajectories Cove. Particle area show them be primarily wind-driven, sensitive bathymetry, higher concentrations inner cove highest hydrographical complexity transitional between marine habitat. The plume covers 5.5 km2 total inlet 9 km2, monthly mean values 15 330 mg/l. maximum are January (790 mg/l), expansion February. model was validated available situ measurements. With this study, we identify areas (and similar coastal environments, prospectively) increasing physical stress by longer residence accumulation rates induced glacial meltwater. These factors crucial pelagic benthic assemblages dependent light food availability, well deposition.

Language: Английский

Citations

25