Reproductive Performance of Seabirds and Seals at South Georgia and Signy Island, South Orkney Islands, 1976–1987: Implications for Southern Ocean Monitoring Studies

1988 ◽  
pp. 261-285 ◽  
Author(s):  
J. P. Croxall ◽  
T. S. McCann ◽  
P. A. Prince ◽  
P. Rothery
Keyword(s):  
Southern Ocean ◽  
Reproductive Performance ◽  
South Georgia ◽  
Orkney Islands ◽  
Signy Island ◽  
South Orkney Islands ◽  
Ocean Monitoring

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.

scholarly journals Snowmelt modelling on signy island, South Orkney Islands

1998 ◽  
Vol 26 ◽  
pp. 161-166 ◽  
Author(s):  
Michael J. Gardiner ◽  
J. Cynan Ellis-Evans ◽  
Malcolm G. Anderson ◽  
Martyn Tranter
Keyword(s):  
Snow Water Equivalent ◽  
Energy Content ◽  
Heat Fluxes ◽  
Geographical Information ◽  
Wave Radiation ◽  
Snow Pack ◽  
State Variables ◽  
Orkney Islands ◽  
Signy Island ◽  
South Orkney Islands

The ability of the Utah energy-balance and snowmelt model (UEB) to simulate decline in snow water equivalent (SWE) at an extreme location was assessed. Field data were collected at Paternoster Valley, Signy Island, South Orkney Islands (60°43′S) during the austral summer of 1996–97. This is the first application of UEB in a maritime Antarctic site. UEB is a physically based snow melt model using a lumped snow-pack representation with primary state variables SWE and snow pack-energy content(U).Meteorological inputs are air temperature, wind speed, humidity, precipitation and total incoming solar and longwave radiation. The Paternoster Valley catchment was subdivided into eight non-contiguous terrain classes for sampling and modelling using a geographical information system (GIS). Simulations of SWE in each of these classes were compared พ with field observations. It is shown that initialUand snow-surface thermal conductance(Ks)affect model simulations. Good approximations of SWE depletion are obtained using measured incoming solar radiation to drive the model but there are shortcomings in the characterization of long wave radiation and sensible-heat fluxes.

A fern cultured from Antarctic glacier detritus

2013 ◽  
Vol 26 (4) ◽  
pp. 341-344 ◽  
Author(s):  
R.I. Lewis Smith
Keyword(s):  
Maritime Antarctic ◽  
Orkney Islands ◽  
Ice Cap ◽  
Signy Island ◽  
South Orkney Islands ◽  
Mode Of Transport

AbstractA fem, Elaphoglossum hybridum (Bory) Brack., has been cultured from mineral sediment in cryoconite holes in the ice cap of Signy Island, South Orkney Islands. Its provenance, mode of transport to its Maritime Antarctic destination and the significance of viable exotic propagules as potential colonists are discussed.

The Nematode and Acanthocephalan Parasites of the Sheathbill, Chionis alba (Gmelin), at Signy Island, South Orkney Islands and a summary of host parasite relationships in the Sheathbill

1969 ◽  
Vol 43 (1-2) ◽  
pp. 59-67 ◽  
Author(s):  
N. V. Jones ◽  
I. C. Williams
Keyword(s):  
Orkney Islands ◽  
British Antarctic Survey ◽  
Signy Island ◽  
South Orkney Islands ◽  
Host Parasite ◽  
Trematode Parasites

We have previously reported on the cestode and trematode parasites of the Sheathbill at Signy Island (Jones & Williams 1967, 1968, 1969) and conclude with an account of the nematodes and Acanthocephala. Our previous reports were based on specimens obtained from 13 Sheathbills collected at Signy Island in July and October, 1965 by Mr. Charles Howie, British Antarctic Survey. In addition to these we have examined a further 12 Sheathbills taken at Signy Island in March, 1967. We are greatly indebted to Mr. E. A. Smith, Senior Biologist, British Antarctic Survey, for arranging the collection and transport of the latter material.

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.

Sign in / Sign up

Export Citation Format

Share Document