Susceptibility modelling of hummocky terrain distribution using the information value method (Deception Island, Antarctic Peninsula)

Geomorphology ◽  
2012 ◽  
Vol 155-156 ◽  
pp. 88-95 ◽  
Author(s):  
Raquel Melo ◽  
Gonçalo Vieira ◽  
Alberto Caselli ◽  
Miguel Ramos
Keyword(s):  
Antarctic Peninsula ◽  
Information Value ◽  
Deception Island ◽  
Information Value Method

Fate and processing of macroalgal wrack subsidies in beaches of Deception Island, Antarctic Peninsula

2014 ◽  
Vol 88 ◽  
pp. 1-10 ◽  
Author(s):  
M. Lastra ◽  
I.F. Rodil ◽  
A. Sánchez-Mata ◽  
M. García-Gallego ◽  
J. Mora
Keyword(s):  
Antarctic Peninsula ◽  
Deception Island

scholarly journals APPLICATION OF A NEW POLARIMETRIC FILTER TO RADARSAT-2 DATA OF DECEPTION ISLAND (ANTARCTIC PENINSULA REGION) FOR SURFACE COVER CHARACTERIZATION

2015 ◽  
Vol XL-7/W3 ◽  
pp. 1035-1039
Author(s):  
S. Guillaso ◽  
T. Schmid ◽  
J. López-Martínez ◽  
O. D'Hondt
Keyword(s):  
Antarctic Peninsula ◽  
Land Surface ◽  
Supervised Classification ◽  
Image Data ◽  
Bilateral Filter ◽  
Support Vector ◽  
Svm Classifier ◽  
Sar Image ◽  
Deception Island ◽  
New Approach

In this paper, we describe a new approach to analyse and quantify land surface covers on Deception Island, a volcanic island located in the Northern Antarctic Peninsula region by means of fully polarimetric RADARSAT-2 (C-Band) SAR image. Data have been filtered by a new polarimetric speckle filter (PolSAR-BLF) that is based on the bilateral filter. This filter is locally adapted to the spatial structure of the image by relying on pixel similarities in both the spatial and the radiometric domains. Thereafter different polarimetric features have been extracted and selected before being geocoded. These polarimetric parameters serve as a basis for a supervised classification using the Support Vector Machine (SVM) classifier. Finally, a map of landform is generated based on the result of the SVM results.

scholarly journals CO1 Metabarcoding of Marine Water Samples from the 2nd Turkish Antarctic Expedition (TAE2) Highlights the Deficiencies in the Reference Barcoding Databases for the Continent

2021 ◽  
Vol 4 ◽  
Author(s):  
Rasit Bilgin ◽  
Kübra Karaman ◽  
Yağmur Tarhana ◽  
Ceylan Yücel ◽  
Elizabeth Hemond ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Methodological Issue ◽  
Demersal Fish ◽  
The Other ◽  
South Shetland Islands ◽  
Marine Biodiversity ◽  
Climate Projections ◽  
Deception Island ◽  
Percent Identity ◽  
The Antarctic

Based on climate projections, the Antarctic Peninsula is one of the regions on the earth expected to be most drastically affected by climate change in the 2nd half of the 21st century. In order to establish baseline levels of marine biodiversity using the environmental DNA approach, we undertook metabarcoding based on the CO1 gene. Samples were collected using 0.22 mM pore-sized Sterivex filters during TAE2 undertaken in 2018, from one site at Deception Island (2 filters), one site at Nansen Island (2 filters), and three sites (one offshore) at Robert Island. A total of 20 taxa were identified (unique hits with BLAST percent identity ≥ 97%) belonging to three kingdoms (Chromista, Plantae, Animalia), nine phyla, 11 classes, 17 orders, 19 families, and 20 genera. Of these, 18 were identified to the species level, one to the genus level, and the other one to the family level. Genetically identified taxa included seven planktonic algae, nine seaweeds, a stalked jellyfish, a nematode, a planktonic copepod, and a demersal fish. In addition, 129 unique OTUs were detected (unique hits with BLAST percent identity < 97%) as unidentified. These results indicate the high levels of undocumented genetic diversity (without CO1 barcode sequences in GenBank) in the Antarctic Peninsula region and adjacent waters, and the need for more work to complete the reference barcode databases for the continent. A dendrogram resulting from cluster analysis (Bray-Curtis similarity measure, group-average linkage) based on the presence/absence data of 20 identified species revealed three well-defined sample (i.e. filter containing DNA fragments of multiple taxa) groups, which almost coincided with their geographical locations. First group included samples (filters) collected from the coast of Deception Island and the second one from the coast of Robert Island, both in the South Shetland Islands, off the northern tip of the Antarctic Peninsula. The third group included samples from Nansen Island coast (off the west coast of Graham Land, Antarctic Peninsula) together with the only sample collected offshore, off Robert Island. The significance of this clustering, thus the difference among sampling sites with regard to species composition, was confirmed by Analysis of Similarity (ANOSIM) results (Global R = 0.982, p = 0.001). The highest number of identified taxa (per filter) and unidentified OTUs (per filter) were observed offshore off Robert Island. Considering that all of the other sampling sites were by the coasts of islands, this observation indicates i) the offshore waters might contain more DNA-bearing material than coastal sites, and/or ii) a methodological issue where the high phytoplankton and suspended matter concentrations by the coasts created a bottleneck in terms of capturing actual species diversity at the coasts, due to clogging of filters by phytoplankton and fine suspended particles.

Electron microprobe characterization of ash layers in sediments from the central Bransfield basin (Antarctic Peninsula): evidence for at least two volcanic sources

2002 ◽  
Vol 14 (4) ◽  
pp. 412-421 ◽  
Author(s):  
S. FRETZDORFF ◽  
J.L. SMELLIE
Keyword(s):  
Antarctic Peninsula ◽  
Hydrothermal Activity ◽  
South Shetland Islands ◽  
Deception Island ◽  
Scotia Sea ◽  
Bransfield Strait ◽  
Sediment Types ◽  
Ash Layer ◽  
Uppermost Layer ◽  
Bransfield Basin

Bransfield Strait, a narrow active rift with three submarine basins, separates the South Shetland Islands from northern Antarctic Peninsula. Volcanism in Bransfield Strait commenced prior to 0.75 Ma and continues, with recent subaerial eruptions at Deception, Bridgeman and Penguin islands, submarine hydrothermal activity and numerous young basaltic seamounts located along the rift axis. Gravity cores were collected from five locations within the central Bransfield basin. Diatomaceous mud interbedded with terrigenous detritus and discrete ash layers up to 10 cm thick are the commonest sediment types in all the cores. The major element compositions of glass shards within the ash layers are, apart from the uppermost layer, compositionally similar to pyroclastic units preserved on Deception Island, a young (<0.75 Ma) active stratovolcano. The uppermost ash layer cannot be closely matched compositionally to any known source in the Antarctic–Scotia Sea–southern South America region. Its presence indicates that a volcanic centre other than Deception Island contributed ash to the Bransfield basin. Based on the shallow stratigraphical position of the compositionally distinctive ash layer, only a few decimetres beneath the seafloor, its source volcano was probably active in historical times (<few hundred years).

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