Six new species of terrestrial algae from Signy Island, South Orkney Islands, Antarctica

1976 ◽  
Vol 11 (4) ◽  
pp. 387-405 ◽  
Author(s):  
Paul A. Broady
Keyword(s):  
New Species ◽  
Orkney Islands ◽  
Signy Island ◽  
South Orkney Islands ◽  
Terrestrial Algae

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.

Paramonostomum signiensis n.sp. (Trematoda: Notocotylidae) from the Sheathbill, Chionis alba (Gmelin), at Signy Island, South Orkney Islands

1969 ◽  
Vol 43 (1-2) ◽  
pp. 53-57 ◽  
Author(s):  
N. V. Jones ◽  
I. C. Williams
Keyword(s):  
New Species ◽  
Parasitological Examination ◽  
Orkney Islands ◽  
British Antarctic Survey ◽  
Signy Island ◽  
South Orkney Islands ◽  
A New Species

Through the generous co-operation of the British Antarctic Survey twelve Sheathbills were collected in April, 1967 at Signy Island, preserved in deep freeze, and made available to us for parasitological examination. Five of the Sheathbills were found to be infected with a new species of notocotylid trematode, namely Paramonostomum signiensis n.sp., which is described below and considered in relation to other species of Paramonostomum Lühe, 1909.

Myriospora, a genus newly reported for Antarctica with a worldwide key to the species

2018 ◽  
Vol 50 (1) ◽  
pp. 101-112
Author(s):  
O. W. PURVIS ◽  
S. FERNÁNDEZ-BRIME ◽  
M. WESTBERG ◽  
M. WEDIN
Keyword(s):  
New Species ◽  
Phylogenetic Analyses ◽  
Strong Support ◽  
First Record ◽  
Mica Schist ◽  
Orkney Islands ◽  
Signy Island ◽  
South Orkney Islands ◽  
Molecular Phylogenetic

AbstractMyriospora signyensis Purvis, Fdez-Brime, M. Westb. & Wedin is described from Signy Island, South Orkney Islands, Antarctica, where it occurs predominantly on quartz mica schist. This represents the first record of the genus for Antarctica. The distinctive interrupted photobiont arrangement places it within the genus Myriospora (formerly known as the ‘Acarospora’ smaragdula group, or Silobia). The new species is characterized by having large, distinctly elevated, sessile apothecia with a prominent margin and a thallus that is usually lobed at the margins and variously orange-red, rust-coloured or brown-pigmented. Molecular phylogenetic analyses inferred with strong support that M. signyensis is closely related to M. scabrida which is similar in having a lobed, imbricate thallus with large and frequently somewhat raised apothecia, but which differs in never being rusty red, by frequently having a larger number of apothecia per areole/squamule and by having a thick and distinctive thalline epinecral layer. Myriospora signyensis is otherwise most similar to M. dilatata but the thallus of M. dilatata is never imbricate-lobate and the ascomata of M. signyensis have larger and more distinctly raised and sessile apothecia. A worldwide key to the 10 species currently recognized in the genus is presented.

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.

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