scholarly journals Geographic distribution of epilithic diatoms (Bacillariophyceae) in Antarctic lakes, South Shetland Islands, Maritime Antarctica Region

Check List ◽  
2019 ◽  
Vol 15 (5) ◽  
pp. 797-809
Author(s):  
Juliana Ferreira da Silva ◽  
Maria Angélica Oliveira ◽  
Rodrigo Paidano Alves ◽  
Ana Paula Vestena Cassol ◽  
Raylane Ribeiro da Anunciação ◽  
...  
Keyword(s):  
Optical Microscope ◽  
Water Systems ◽  
South Shetland Islands ◽  
Maritime Antarctica ◽  
Shetland Islands ◽  
Epilithic Diatoms ◽  
Polar Environment ◽  
Low Diversity ◽  
Unique Species ◽  
Antarctic Environment

Organisms adapt to the environment by establishing themselves in suitable locations. Adaptation to the harsh Antarctic environment is no different. In this work the communities of epilithic diatoms in ice-free areas of water systems of five Antarctic islands are studied. The samples were oxidized, and permanent sheets were later prepared for analysis of the material. They were examined using an optical microscope and mounted on stubs for identification of the taxon in an electron microscope. Fifty-nine species distributed in 28 genera were collected. Only four species were observed in all study areas. Deception Island had unique species in comparison with those on other islands. Knowing the diatom community is a first step in understanding the systems that they inhabit. The polar environment is challenging due to the difficulty of sampling and low diversity and abundance.

scholarly journals Distribution of aerophilous diatom communities associated with terrestrial green macroalgae in the South Shetland Islands, Maritime Antarctica

PLoS ONE ◽  
2019 ◽  
Vol 14 (12) ◽  
pp. e0226691
Author(s):  
Juliana Ferreira da Silva ◽  
Maria Angélica Oliveira Linton ◽  
Raylane Ribeiro da Anunciação ◽  
Eduardo Pereira da Silva ◽  
Rodrigo Paidano Alves ◽  
...  
Keyword(s):  
South Shetland Islands ◽  
The South ◽  
Maritime Antarctica ◽  
Green Macroalgae ◽  
Shetland Islands ◽  
Diatom Communities

Biosurfactant production by yeasts from different types of soil of the South Shetland Islands (Maritime Antarctica)

2019 ◽  
Vol 126 (5) ◽  
pp. 1402-1413 ◽  
Author(s):  
J.L. Bueno ◽  
P.A.D. Santos ◽  
R.R. da Silva ◽  
I.S. Moguel ◽  
A. Pessoa ◽  
...  
Keyword(s):  
Biosurfactant Production ◽  
South Shetland Islands ◽  
The South ◽  
Maritime Antarctica ◽  
Shetland Islands ◽  
Different Types

Cultivable fungi associated with bryosphere of bipolar mosses Polytrichastrum alpinum and Polytrichum juniperinum in King George Island, South Shetland Islands, Maritime Antarctica

Polar Biology ◽  
2020 ◽  
Vol 43 (5) ◽  
pp. 545-553 ◽  
Author(s):  
Camila Rodrigues de Carvalho ◽  
Mariana Costa Ferreira ◽  
Vívian Nicolau Gonçalves ◽  
Ana Raquel de Oliveira Santos ◽  
Michelline Carvalho-Silva ◽  
...  
Keyword(s):  
South Shetland Islands ◽  
King George Island ◽  
Maritime Antarctica ◽  
Shetland Islands

scholarly journals Polyphasic characterization of 10 selected ecologically relevant filamentous cyanobacterial strains from the South Shetland Islands, Maritime Antarctica

2016 ◽  
Vol 92 (7) ◽  
pp. fiw100 ◽  
Author(s):  
Miroslava Jancusova ◽  
Lubomir Kovacik ◽  
Antonio Batista Pereira ◽  
Roman Dusinsky ◽  
Annick Wilmotte
Keyword(s):  
South Shetland Islands ◽  
The South ◽  
Maritime Antarctica ◽  
Shetland Islands ◽  
Polyphasic Characterization

Humidophila komarekiana sp. nov. (Bacillariophyta), a new limnoterrestrial diatom species from King George Island (Maritime Antarctica)

Phytotaxa ◽  
2016 ◽  
Vol 272 (3) ◽  
pp. 184 ◽  
Author(s):  
NATALIA KOCHMAN-KĘDZIORA ◽  
TERESA NOGA ◽  
RALITSA ZIDAROVA ◽  
KATEŘINA KOPALOVÁ ◽  
BART VAN DE VIJVER
Keyword(s):  
New Species ◽  
Marine Diatom ◽  
South Shetland Islands ◽  
Diatom Species ◽  
King George Island ◽  
Maritime Antarctica ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Shetland Islands ◽  
The Antarctic

During a survey of the non-marine diatom flora of King George Island (South Shetland Islands), an unknown Humidophila taxon was recorded. Detailed light and scanning electron microscopy observations indicated that the unknown taxon could not be identified based on the currently available literature. The new species is described as Humidophila komarekiana sp. nov. and is characterized in having strictly linear valves with parallel margins and broadly rounded, never protracted apices, a filiform raphe with almost indistinct, straight proximal and distal raphe endings. The striae are composed of one, irregularly shortened areola. The mantle areolae are interrupted at the apices. The new species is compared with similar taxa in the Antarctic Region and worldwide. Notes on the ecology of the new species are added.

scholarly journals First Record of Juncaceicola as Endophytic Fungi Associated with Deschampsia antarctica Desv.

Diversity ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 107 ◽  
Author(s):  
Guilherme de Andrade ◽  
Ehidy Cañón ◽  
Rodrigo Alves ◽  
Daniela Schmitz ◽  
Adriano Schünemann ◽  
...  
Keyword(s):  
First Record ◽  
South Shetland Islands ◽  
Deschampsia Antarctica ◽  
Maritime Antarctica ◽  
Internal Transcribed Spacer Region ◽  
Shetland Islands ◽  
Starting Point ◽  
First Occurrence ◽  
A New Species

In the current study, we present the molecular characterization of an endophyte fungus associated with the leaves of Deschampsia antarctica Desv. (Poaceae), a monocot species native to Antarctica. The isolate was obtained from 90 leaf fragments from two distinct collection sites, both located on Half Moon Island, South Shetland Islands and Maritime Antarctica. The internal transcribed spacer region (ITS) was sequenced and the endophytic fungus was identified as belonging to the genus Juncaceicola Tennakoon, Camporesi, Phook and K.D. Hyde (99% nucleotide sequence identity). When compared to all fungi of the genus Juncaceicola deposited in data base, our isolate showed greater proximity with Juncaceicola typharum, however, because it presents a low bootstrap value to be considered a new species, we treat it as Juncaceicola cf. typharum. Moreover, the identification of our isolate as belonging to the genus Juncaceicola makes this the first occurrence of a species of this genus to be associated with the leaves of Antarctic plants. This work is considered as a starting point for other studies with fungi of this genus associated with leaves of Deschampsia antarctica, as it presents results from two collection points on a single Antarctic island, suggesting that new sites and new Antarctic islands should be explored.

Ecological relationships and stoichiometry within a Maritime Antarctic watershed

2013 ◽  
Vol 25 (2) ◽  
pp. 191-197 ◽  
Author(s):  
David Velázquez ◽  
Maria Ángeles Lezcano ◽  
Ana Frias ◽  
Antonio Quesada
Keyword(s):  
Microbial Mats ◽  
Minor Component ◽  
South Shetland Islands ◽  
Maritime Antarctica ◽  
Nutrient Pools ◽  
Shetland Islands ◽  
Ecological Relationships ◽  
P Content ◽  
A Minor ◽  
Water Catchment

AbstractDuring summer, ice-free areas are common in Maritime Antarctica, and vegetation and microbial communities frequently occur in the moist parts of catchments. In this paper, we present new data and evaluate the biomass, C, N, and P content of various types of vegetation, and the water catchment of an oligotrophic lake sited at Byers Peninsula, Livingston Island, South Shetland Islands. As the main results show, the total amount of C, N, and P contained in the organisms of the watershed is 144, 0.71 and 0.018 g m-2, respectively. According to element contents, 98% of the biological C from the watershed is within mosses and microbial mats structures (79.1 and 19.0% respectively). Also, 98.7% of the N is partially distributed between moss carpets, microbial mats and lichens, 55.2, 43.5, and 3.37 x 10-7% respectively. On the other hand, 90.2% of P is within moss carpets structures. Nutrient pools in the communities of Limnopolar Lake itself are a minor component of the whole catchment.

scholarly journals Soil characteristics on varying lithological substrates in the South Shetland Islands, maritime Antarctica

Geoderma ◽  
2008 ◽  
Vol 144 (1-2) ◽  
pp. 123-139 ◽  
Author(s):  
Ana Navas ◽  
Jerónimo López-Martínez ◽  
José Casas ◽  
Javier Machín ◽  
Juan José Durán ◽  
...  
Keyword(s):  
Soil Characteristics ◽  
South Shetland Islands ◽  
The South ◽  
Maritime Antarctica ◽  
Shetland Islands

Phenotypic and ecological diversity of freshwater coccoid cyanobacteria from maritime Antarctica and Islands of NW Weddell Sea. II.

2014 ◽  
Vol 4 (1) ◽  
pp. 17-39 ◽  
Author(s):  
Jiří Komárek
Keyword(s):  
Natural Populations ◽  
Weddell Sea ◽  
South Shetland Islands ◽  
Eastern Region ◽  
Maritime Antarctica ◽  
Shetland Islands ◽  
North Eastern ◽  
Modern System ◽  
Freshwater Habitats ◽  
James Ross Island

The article contains the second part of the review of natural populations of coccoid (unicellular, colonial) cyanobacteria from the coastal, maritime Antarctica and the vicinity of Antarctic Peninsula, mainly from its north-eastern region. The samples were collected from several localities with terrestrial and freshwater habitats of the deglaciated parts of South Shetland Islands, and from the northern part of James Ross Island. The material was identified according to the modern system (Komárek et al. 2014b). This second part contains 16 species (from 12 genera) from the cytologically more complicated orders Chroococcales, Pleurocapsales and Chroococcidiopsidales, characterized also by more irregular thylakoidal system. Similarly as in types from the order Synechococcales, all species are connected with special habitats and their cultivation is difficult. They are adapted to the special biotopes and in spite of their relatively wide diversity, only few occurred rarely in massive populations. Several species are evidently endemic for Antarctica, 8 species are described as new recognized taxa.

Sign in / Sign up

Export Citation Format

Share Document