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.

scholarly journals New species of Psolus Oken from Antarctica (Echinodermata: Holothuroidea: Psolidae)

Zootaxa ◽  
2010 ◽  
Vol 2528 (1) ◽  
pp. 61 ◽  
Author(s):  
P. MARK O’LOUGHLIN ◽  
EMILY WHITFIELD
Keyword(s):  
New Species ◽  
The South ◽  
South Georgia ◽  
Orkney Islands ◽  
South Orkney Islands ◽  
Three New Species

Three new species of Psolus Oken from Antarctica are described: Psolus byrdae sp. nov. from the Marie Byrd Seamount; Psolus carolineae sp. nov. from South Georgia; Psolus lockhartae sp. nov. from the South Orkney Islands.

scholarly journals Ocean currents as a potential dispersal pathway for Antarctica’s most persistent non-native terrestrial insect

Polar Biology ◽  
2021 ◽  
Author(s):  
Jesamine C. Bartlett ◽  
P. Convey ◽  
K. A. Hughes ◽  
S. E. Thorpe ◽  
S. A. L. Hayward
Keyword(s):  
Antarctic Peninsula ◽  
Native Species ◽  
Sea Water ◽  
Ocean Current ◽  
The South ◽  
Near Surface ◽  
Orkney Islands ◽  
Signy Island ◽  
South Orkney Islands ◽  
The Antarctic

AbstractThe non-native midge Eretmoptera murphyi is Antarctica’s most persistent non-native insect and is known to impact the terrestrial ecosystems. It inhabits by considerably increasing litter turnover and availability of soil nutrients. The midge was introduced to Signy Island, South Orkney Islands, from its native South Georgia, and routes of dispersal to date have been aided by human activities, with little known about non-human-assisted methods of dispersal. This study is the first to determine the potential for dispersal of a terrestrial invertebrate species in Antarctica by combining physiological sea water tolerance data with quantitative assessments of ocean current journey times. Fourth instar larvae tolerated sea water submergence for up to 21 days, but submerged egg sacs had significantly reduced hatching success. Using near-surface drifter data, we conclude that ocean current dispersal from Signy Island would not present a risk of species transfer beyond the South Orkney Islands on the tested timescales. However, if E. murphyi were to be introduced to the South Shetlands Islands or Adelaide Island, which are located offshore of the Antarctic Peninsula, there would be a risk of successful oceanic dispersal to neighbouring islands and the Antarctic Peninsula mainland. This study emphasises the need for effective biosecurity measures and demonstrates the role that currently undocumented pathways may have in dispersing non-native species.

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.

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