scholarly journals Using habitat models to identify marine important bird and biodiversity areas for Chinstrap Penguins Pygoscelis antarcticus in the South Orkney Islands

Polar Biology ◽  
2018 ◽  
Vol 42 (1) ◽  
pp. 17-25 ◽  
Author(s):  
M. P. Dias ◽  
V. Warwick-Evans ◽  
A. P. B. Carneiro ◽  
C. Harris ◽  
B. G. Lascelles ◽  
...  
Keyword(s):  
The South ◽  
Habitat Models ◽  
Orkney Islands ◽  
Pygoscelis Antarcticus ◽  
South Orkney Islands

scholarly journals Identification of marine Important Bird and Biodiversity Areas for penguins around the South Shetland Islands and South Orkney Islands

2018 ◽  
Vol 8 (21) ◽  
pp. 10520-10529 ◽  
Author(s):  
Maria P. Dias ◽  
Ana Paula Bertoldi Carneiro ◽  
Victoria Warwick-Evans ◽  
Colin Harris ◽  
Katharina Lorenz ◽  
...  
Keyword(s):  
South Shetland Islands ◽  
The South ◽  
Shetland Islands ◽  
Orkney Islands ◽  
South Orkney Islands

Theudium Austroatlanticum (Verrucariaceae), A New Species from the South Orkney Islands

1993 ◽  
Vol 25 (3) ◽  
pp. 271-277 ◽  
Author(s):  
Alan Orange
Keyword(s):  
New Species ◽  
The South ◽  
Orkney Islands ◽  
Signy Island ◽  
South Orkney Islands ◽  
A New Species

AbstractThelidium austroatlanticum sp. nov. is described from Signy island; it is characterized by an epilithic thallus, more or less appressed involucrellum, and 1-septate spores 30–40 μm long. Thelidium incavatum is also reported for Signy Island.

The South Orkney Islands

1936 ◽  
Vol 87 (5) ◽  
pp. 470
Author(s):  
H. R. M. ◽  
James W. S. Marr
Keyword(s):  
The South ◽  
Orkney Islands ◽  
South Orkney Islands

scholarly journals Variability of the Antarctic Slope Current System in the Northwestern Weddell Sea

2017 ◽  
Vol 47 (12) ◽  
pp. 2977-2997 ◽  
Author(s):  
Marina Azaneu ◽  
Karen J. Heywood ◽  
Bastien Y. Queste ◽  
Andrew F. Thompson
Keyword(s):  
Current System ◽  
Water Layer ◽  
Bottom Layer ◽  
Weddell Sea ◽  
The South ◽  
Orkney Islands ◽  
Dense Water ◽  
South Orkney Islands ◽  
Antarctic Slope Current ◽  
The Antarctic

AbstractThe dense water outflow from the Antarctic continental shelf is closely associated with the strength and position of the Antarctic Slope Front. This study explores the short-term and spatial variability of the Antarctic Slope Front system and the mechanisms that regulate cross-slope exchange using highly temporally and spatially resolved measurements from three ocean gliders deployed in 2012. The 22 sections along the eastern Antarctic Peninsula and west of the South Orkney Islands are grouped regionally and composited by isobaths. There is consistency in the front position around the Powell Basin, varying mostly between the 500- and 800-m isobaths. In most of the study area the flow is bottom intensified. The along-slope transport of the Antarctic Slope Current (upper 1000 m) varies between 0.2 and 5.9 Sv (1 Sv ≡ 106 m3 s−1) and does not exhibit a regional pattern. The magnitude of the velocity field shows substantial variability, up to twice its mean value. Higher eddy kinetic energy (0.003 m2 s−2) is observed in sections with dense water, possibly because of baroclinic instabilities in the bottom layer. Distributions of potential vorticity show an increase toward the shelf along isopycnals and also in the dense water layer. Glider sections located west of the South Orkney Islands indicate a northward direction of the flow associated with the Weddell Front, which differs from previous estimates of the mean circulation. This study provides some of the first observational confirmation of the high-frequency variability associated with an active eddy field that has been suggested by recent numerical simulations in this region.

Dispersal of male and female Antarctic fur seals (Arctocephalus gazella)

1998 ◽  
Vol 55 (4) ◽  
pp. 845-852 ◽  
Author(s):  
I L Boyd ◽  
D J McCafferty ◽  
K Reid ◽  
R Taylor ◽  
T R Walker
Keyword(s):  
Arctocephalus Gazella ◽  
Adult Males ◽  
The South ◽  
Male And Female ◽  
Breeding Sites ◽  
South Georgia ◽  
Orkney Islands ◽  
Fur Seals ◽  
South Orkney Islands ◽  
Antarctic Fur Seals

This study examined the foraging locations of adult male and female Antarctic fur seals (Arctocephalus gazella) in the Scotia Sea during the postbreeding period. Satellite transmitters were used to track adult males and females and to obtain information about dive depths. Male fur seals migrated away from the breeding area during the postbreeding period whereas females remained close to the breeding grounds and foraged in the same area during two consecutive years. The most intensive foraging by females was associated with the edge of the continental shelf of South Georgia. Males dived deeper than females. Counts of males at South Georgia and at the South Orkney Islands support the result from satellite tracking data showing that males move from South Georgia to the South Orkney Islands at the end of the breeding season. Unlike males, females were limited in their foraging range by the necessity to return to feed dependent young, so breeding sites are likely to be located close to foraging areas that are optimal for females. Locations used for feeding by females were avoided by males, either because they were suboptimal for males or because foraging by females at South Georgia causes local depletion of food, and males, which have the option to forage further afield, can forage more successfully in regions where there are no females. Comparison with fisheries data also suggests that these fur seals are targeting the most abundant exploitable prey.

scholarly journals Distribution patterns of chaetognata, polychaeta, pteropoda and salpidae off south georgia and south orkney islands

2010 ◽  
Vol 58 (4) ◽  
pp. 287-298 ◽  
Author(s):  
Alina María Crelier ◽  
José Roberto Dadon ◽  
Hernán G. Isbert-Perlender ◽  
Daniel Eduardo Nahabedian ◽  
María Cristina Daponte
Keyword(s):  
Distribution Patterns ◽  
Polar Front ◽  
Species Density ◽  
The South ◽  
South Georgia ◽  
Orkney Islands ◽  
Pattern Frequency ◽  
South Orkney Islands ◽  
Circumpolar Current ◽  
Using Data

The distribution pattern, frequency and density (ind./1000 m) of different mesozooplankton species from the South Georgia Islands, South Orkney Islands and the Weddell-Scotia Confluence were analyzed using data obtained in 1994. The maximum densities of the species found were: Eukrohnia hamata (5330), Sagitta gazellae (1052), Clione limacina antarctica (450), Spongiobranchaea australis (375), Clio sulcata (100), Limacina helicina (4076 x 10³), Limacina retroversa (71 x 10(4)), Pelagobia longicirrata (29170), Rhynchonereella bongraini (117), Tomopteris carpenterii (26), Tomopteris planktonis (498), Tomopteris septentrionales (498) and Salpa thompsoni (189). Species density and frequency decreased from South Georgia to the South Orkney Islands, recording intermediate values at the Weddell-Scotia Confluence. Species density in the South Orkney area seemed to be limited by variations in temperature and salinity. The southern area around South Georgia showed the highest density of species, probably due to the influence of the Southern Front of the Antarctic Circumpolar Current. The presence of species characteristic of sub-Antarctic waters such as L. retroversa in the Confluence area could be related to the southward movements of eddies that originate in the Polar Front.

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