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Keywords = Marambio (Seymour) Island

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33 pages, 11328 KB  
Article
New Species of Vegavis (Neornithes) from Antarctica Highlights Unexpected Cretaceous Antarctic Diversity
by Facundo Irazoqui, Carolina Acosta Hospitaleche, Ariana Paulina-Carabajal, Paula Bona and Nahuel Vega
Diversity 2026, 18(2), 82; https://doi.org/10.3390/d18020082 - 30 Jan 2026
Abstract
A fossil bird (MLP-PV 15-I-7-52) from Marambio (Seymour) Island, Antarctica, is described, representing the best-preserved skull reported for a Cretaceous neornithine and associated postcranial elements. Morphological analysis of the articular portion of the mandible, the pterygoid, and the femur supports the assignment of [...] Read more.
A fossil bird (MLP-PV 15-I-7-52) from Marambio (Seymour) Island, Antarctica, is described, representing the best-preserved skull reported for a Cretaceous neornithine and associated postcranial elements. Morphological analysis of the articular portion of the mandible, the pterygoid, and the femur supports the assignment of this specimen to the genus Vegavis. The palatine morphology exhibits a combination of plesiomorphic and autapomorphic characters within Neognathae. Substantial differences in the size relationship between the ala preacetabularis and the femur, as well as differences between the femora of V. iaai and MLP-PV 15-I-7-52, indicate that the latter represents a new species of Vegavis. In addition, a third species of Vegavis is proposed based on the AMNH FARB 30899 specimen, previously assigned to V. iaai, which exhibits substantial differences with the above-mentioned specimens, particularly in the mandibular morphology. Full article
(This article belongs to the Collection Feature Papers in Animal Diversity)
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18 pages, 6900 KB  
Article
Macrogenomic Analysis Reveals Soil Microbial Diversity in Different Regions of the Antarctic Peninsula
by Jiangyong Qu, Xiaofei Lu, Tianyi Liu, Ying Qu, Zhikai Xing, Shuang Wang, Siluo Jing, Li Zheng, Lijun Wang and Xumin Wang
Microorganisms 2024, 12(12), 2444; https://doi.org/10.3390/microorganisms12122444 - 27 Nov 2024
Cited by 2 | Viewed by 2104
Abstract
(1) Background: The unique geographical and climatic conditions of the Antarctic Peninsula contribute to distinct regional ecosystems. Microorganisms are crucial for sustaining the local ecological equilibrium. However, the variability in soil microbial community diversity across different regions of the Antarctic Peninsula remains underexplored. [...] Read more.
(1) Background: The unique geographical and climatic conditions of the Antarctic Peninsula contribute to distinct regional ecosystems. Microorganisms are crucial for sustaining the local ecological equilibrium. However, the variability in soil microbial community diversity across different regions of the Antarctic Peninsula remains underexplored. (2) Methods: We utilized metagenome sequencing to investigate the composition and functionality of soil microbial communities in four locations: Devil Island, King George Island, Marambio Station, and Seymour Island. (3) Results: In the KGI region, we observed increased abundance of bacteria linked to plant growth promotion and the degradation of pollutants, including PAHs. Conversely, Marambio Station exhibited a significant reduction in bacterial abundance associated with iron and sulfur oxidation/reduction. Notably, we identified 94 antibiotic resistance genes (ARGs) across 15 classes of antibiotics in Antarctic soils, with those related to aminoglycosides, β-lactamase, ribosomal RNA methyltransferase, antibiotic efflux, gene regulatory resistance, and ABC transporters showing a marked influence from anthropogenic activities. (4) Conclusions: This study carries substantial implications for the sustainable use, advancement, and conservation of microbial resources in Antarctic soils. Full article
(This article belongs to the Topic Environmental Bioengineering and Geomicrobiology)
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12 pages, 6758 KB  
Article
Evidencing Fluid Migration of the Crust during the Seismic Swarm by Using 1D Magnetotelluric Monitoring
by Carlos A. Vargas, Alexander Caneva, Juan M. Solano, Adriana M. Gulisano and Jaime Villalobos
Appl. Sci. 2023, 13(4), 2683; https://doi.org/10.3390/app13042683 - 19 Feb 2023
Cited by 5 | Viewed by 2562
Abstract
We applied multi–temporal 1D magnetotelluric (MT) surveys to identify space–time anomalies of apparent resistivity (ρa) in the upper lithosphere in the Antarctic Peninsula (the border between the Antarctic and the Shetland plates). We used time series over several weeks of [...] Read more.
We applied multi–temporal 1D magnetotelluric (MT) surveys to identify space–time anomalies of apparent resistivity (ρa) in the upper lithosphere in the Antarctic Peninsula (the border between the Antarctic and the Shetland plates). We used time series over several weeks of the natural Earth’s electric and magnetic fields registered at one MT station of the Universidad Nacional de Colombia (RSUNAL) located at Seymour–Marambio Island, Antarctica. We associated resistivity anomalies with contrasting earthquake activity. Anomalies of ρa were detected almost simultaneously with the beginning of a seismic crisis in the Bransfield Strait, south of King George Island (approximately 85.000 events were reported close to the Orca submarine volcano, with focal depths < 20 km and MWW < 6.9). We explained the origin of these anomalies in response to fluid migration near the place of the fractures linked with the seismic swarm, which could promote disturbances of the pore pressure field that reached some hundreds of km away. Full article
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