scholarly journals Antarctic beaked whale echolocation signals near South Scotia Ridge

2015 ◽  
Vol 31 (3) ◽  
pp. 1265-1274 ◽  
Author(s):  
Jennifer S. Trickey ◽  
Simone Baumann-Pickering ◽  
John A. Hildebrand ◽  
Maria Vanesa Reyes Reyes ◽  
Mariana Melcón ◽  
...  
Keyword(s):  
Beaked Whale ◽  
Scotia Ridge ◽  
South Scotia Ridge

scholarly journals Metagenomic characterization of the viral community of the South Scotia Ridge

2018 ◽  
Author(s):  
Qingwei Yang ◽  
Chen Gao ◽  
Yong Jiang ◽  
Min Wang ◽  
Xinhao Zhou ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Antarctic Peninsula ◽  
Phylogenetic Analyses ◽  
Marker Genes ◽  
Scotia Ridge ◽  
The Pacific ◽  
Viral Communities ◽  
The Pacific Ocean ◽  
The Antarctic ◽  
South Scotia Ridge

AbstractViruses are the most abundant biological entities in aquatic ecosystems and harbor an enormous genetic diversity. While their great influence on the marine ecosystems is widely acknowledged, current information about their diversity remains scarce. Aviral metagenomic analysis of two surfaces and one bottom water sample was conducted from sites on the South Scotia Ridge (SSR) near the Antarctic Peninsula, during the austral summer 2016. The taxonomic composition and diversity of the viral communities were investigated and a functional assessment of the sequences was determined. Phylotypic analysis showed that most viruses belonging to the order Caudovirales, in particular, the family Podoviridae (41.92-48.7%), which is similar to the viral communities from the Pacific Ocean. Functional analysis revealed a relatively high frequency of phage-associated and metabolism genes. Phylogenetic analyses of phage TerL and Capsid_NCLDV (nucleocytoplasmic large DNA viruses) marker genes indicated that many of the sequences associated with Caudovirales and NCLDV were novel and distinct from known complete phage genomes. High Phaeocystis globosa virus virophage (Pgvv) signatures were found in SSR area and complete and partial Pgvv-like were obtained which may have an influence on host-virus interactions in the area during summer. Our study expands the existing knowledge of viral communities and their diversities from the Antarctic region and provides basic data for further exploring polar microbiomes.ImportanceIn this study, we used high-throughput sequencing and bioinformatics analysis to analyze the viral community structure and biodiversity of SSR in the open sea near the Antarctic Peninsula. The results showed that the SSR viromes are novel, oceanic-related viromes and a high proportion of sequence reads was classified as unknown. Among known virus counterparts, members of the order Caudovirales were most abundant which is consistent with viromes from the Pacific Ocean. In addition, phylogenetic analyses based on the viral marker genes (TerL and MCP) illustrate the high diversity among Caudovirales and NCLDV. Combining deep sequencing and a random subsampling assembly approach, a new Pgvv-like group was also found in this region, which may a signification factor regulating virus-host interactions.

scholarly journals Metagenomic Characterization of the Viral Community of the South Scotia Ridge

2018 ◽  
Author(s):  
Qingwei Yang ◽  
Chen Gao ◽  
Jiang Yong ◽  
Ming Wang ◽  
Xinhao Zhou ◽  
...  
Keyword(s):  
Phylogenetic Analyses ◽  
Great Influence ◽  
Austral Summer ◽  
Taxonomic Composition ◽  
Marker Genes ◽  
The South ◽  
Scotia Ridge ◽  
Viral Communities ◽  
The Antarctic ◽  
South Scotia Ridge

Viruses are the most abundant biological entities in aquatic ecosystems and harbor an enormous genetic diversity. While their great influence on the marine ecosystems is widely acknowledged, current information about their diversity remains scarce. A viral metagenomic analysis of three water samples was conducted from sites on the South Scotia Ridge (SSR) near the Antarctic Peninsula, during the austral summer 2016. The taxonomic composition and diversity of the viral communities were investigated and a functional assessment of the sequences was determined. Phylotypic analysis showed that most viruses belonging to the order Caudovirales, especially the family Podoviridae (41.92-48.7%), similar to the viromes from the Pacific Ocean. Functional analysis revealed a relatively high frequency of phage-associated and metabolism genes. Phylogenetic analyses of phage TerL and Capsid_NCLDV (nucleocytoplasmic large DNA viruses) marker genes indicated that many sequences associated with Caudovirales and NCLDV were novel and distinct from known phage genomes. High Phaeocystis globosa virus virophage (Pgvv) signatures were found in SSR area and complete and partial Pgvv-like were obtained which may have an influence on host-virus interactions. Our study expands the existing knowledge of viral communities and their diversities from the Antarctic region and provides basic data for further exploring polar microbiomes.

Geochronology and geochemistry of the South Scotia Ridge: Miocene island arc volcanism of the Scotia Sea

2021 ◽  
pp. 103615
Author(s):  
Teal R. Riley ◽  
Alex Burton-Johnson ◽  
Philip T. Leat ◽  
Kelly A. Hogan ◽  
Alison M. Halton
Keyword(s):  
Island Arc ◽  
The South ◽  
Scotia Sea ◽  
Arc Volcanism ◽  
Scotia Ridge ◽  
Island Arc Volcanism ◽  
South Scotia Ridge

Transtensional tectonics along the south Scotia Ridge, Antarctica

1996 ◽  
Vol 267 (1-4) ◽  
pp. 31-56 ◽  
Author(s):  
J. Acosta ◽  
E. Uchupi
Keyword(s):  
The South ◽  
Scotia Ridge ◽  
South Scotia Ridge

Water mass pathways and transports over the South Scotia Ridge west of 50°W

2012 ◽  
Vol 59 ◽  
pp. 8-24 ◽  
Author(s):  
Margarita Palmer ◽  
Damià Gomis ◽  
Maria del Mar Flexas ◽  
Gabriel Jordà ◽  
Loic Jullion ◽  
...  
Keyword(s):  
Water Mass ◽  
The South ◽  
Scotia Ridge ◽  
South Scotia Ridge

scholarly journals An abandoned rift in the southwestern part of the South Scotia Ridge (Antarctica): Implications for the genesis of the Bransfield Strait

Tectonics ◽  
2015 ◽  
Vol 34 (12) ◽  
pp. 2451-2464 ◽  
Author(s):  
Emanuele Lodolo ◽  
Lara F. Pérez
Keyword(s):  
The South ◽  
Southwestern Part ◽  
Bransfield Strait ◽  
Scotia Ridge ◽  
South Scotia Ridge

3D model of a sector of the South Scotia Ridge (Antarctica)

2009 ◽  
Vol 35 (1) ◽  
pp. 83-91 ◽  
Author(s):  
Sara Susini ◽  
Mauro De Donatis
Keyword(s):  
3D Model ◽  
The South ◽  
Scotia Ridge ◽  
South Scotia Ridge

scholarly journals Surface Circulation at the Tip of the Antarctic Peninsula from Drifters

2009 ◽  
Vol 39 (1) ◽  
pp. 3-26 ◽  
Author(s):  
Andrew F. Thompson ◽  
Karen J. Heywood ◽  
Sally E. Thorpe ◽  
Angelika H. H. Renner ◽  
Armando Trasviña
Keyword(s):  
Antarctic Peninsula ◽  
Weddell Sea ◽  
Ecosystem Dynamics ◽  
Mean Flow ◽  
The South ◽  
Scotia Ridge ◽  
Surface Circulation ◽  
Dominant Feature ◽  
The Antarctic ◽  
South Scotia Ridge

Abstract An array of 40 surface drifters, drogued at 15-m depth, was deployed in February 2007 to the east of the tip of the Antarctic Peninsula as part of the Antarctic Drifter Experiment: Links to Isobaths and Ecosystems (ADELIE) project. Data obtained from these drifters and from a select number of local historical drifters provide the most detailed observations to date of the surface circulation in the northwestern Weddell Sea. The Antarctic Slope Front (ASF), characterized by a ∼20 cm s−1 current following the 1000-m isobath, is the dominant feature east of the peninsula. The slope front bifurcates when it encounters the South Scotia Ridge with the drifters following one of three paths. Drifters (i) are carried westward into Bransfield Strait; (ii) follow the 1000-m isobath to the east along the southern edge of the South Scotia Ridge; or (iii) become entrained in a large-standing eddy over the South Scotia Ridge. Drifters are strongly steered by contours of f /h (Coriolis frequency/depth) as shown by calculations of the first two moments of displacement in both geographic coordinates and coordinates locally aligned with contours of f /h. An eddy-mean decomposition of the drifter velocities indicates that shear in the mean flow makes the dominant contribution to dispersion in the along-f /h direction, but eddy processes are more important in dispersing particles across contours of f /h. The results of the ADELIE study suggest that the circulation near the tip of the Antarctic Peninsula may influence ecosystem dynamics in the Southern Ocean through Antarctic krill transport and the export of nutrients.

Continental fragmentation along the South Scotia Ridge transcurrent plate boundary (NE Antarctic Peninsula)

1996 ◽  
Vol 258 (1-4) ◽  
pp. 275-301 ◽  
Author(s):  
J. Galindo-Zaldívar ◽  
A. Jabaloy ◽  
A. Maldonado ◽  
C. Sanz de Galdeano
Keyword(s):  
Antarctic Peninsula ◽  
Plate Boundary ◽  
The South ◽  
Scotia Ridge ◽  
South Scotia Ridge
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