|
|
|
| Registros recuperados: 78 | |
|
|
| Campos,Maurício; Mothes,Beatriz; Veitenheimer Mendes,Inga L.. |
| The aim of this work is to redescribe 11 species of sponges collected through the Brazilian Antarctic Program (PROANTAR), at the South Shetland Islands and vicinity. New information is provided on the Antarctic sponge fauna, in regard to species richness and the geographical and bathymetric distributions of identified species. The following species were identified and are here illustrated and fully described: Cinachyra antarctica (Carter, 1872), Cinachyra barbata Sollas, 1886, Craniella leptoderma (Sollas, 1886), Tethyopsis longispinum (Lendenfeld, 1907), Polymastia invaginata Kirkpatrick, 1907, Homaxinella balfourensis (Ridley & Dendy, 1886), Suberites montiniger Carter, 1880, Halichondria (Eumastia) attenuata (Topsent, 1915), Haliclona... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antarctica; PROANTAR; Taxonomy. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000300021 |
| |
|
|
| Campos,Maurício; Mothes,Beatriz; Veitenheimer Mendes,Inga L.. |
| In the present study 16 species are registered for the South Shetland Islands and vicinity: Acanthorhabdus fragilis Burton, 1929, Iophon unicornis Topsent, 1907, Clathria (Axosuberites) flabellata (Topsent, 1916), Clathria (Axosuberites) nidificata (Kirkpatrick, 1907), Kirkpatrickia variolosa (Kirkpatrick, 1907), Myxodoryx hanitschi (Kirkpatrick, 1907), Iotroata somovi (Koltun, 1964), Tedania (Tedaniopsis) charcoti (Topsent, 1907), Tedania (Tedaniopsis) vanhoffeni (Hentschel, 1914), Tedania (Tedaniopsis) oxeata (Topsent, 1916), Isodictya kerguelenensis (Ridley & Dendy, 1886), Isodictya lankesteri (Kirkpatrick, 1907), Isodictya toxophila Burton, 1932, Isodictya bentarti Ríos, Cristobo & Urgorri, 2004, Latrunculia (Latrunculia) brevis Ridley... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antarctica; New occurrences; PROANTAR; Taxonomy. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000300027 |
| |
|
|
| Rodrigues,Luiz Antonio da Costa; Agostini,Kamila da Matta; Alencar,Alexandre Santos de; Mendonça,Cláudia Barbieri Ferreira; Carvalho,Marcelo Araújo de; Gonçalves-Esteves,Vania. |
| ABSTRACT The procedures for a set of techniques to recover grains of pollen 26 and spores from liquid samples are described. Liquefied samples of matrices, such as melting lakes, snow and ice, can provide a record of climatic and environmental events at different geographic and temporal scales. The need for standardization of techniques was demonstrated in research carried out with matrices of snow and water of thawing lakes and snow collected on King George and Joinville islands (Antarctica). The use of the methods described can permit increased rescue of palynomorphs from liquid matrices, thereby adding greater reliability to palynological data and its use as a biotracer of environmental events. Methods of sieving and centrifugation were tested, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antarctica; Ice; Spores; Snow; Technique to recover grains of pollen. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400667 |
| |
|
| |
|
| |
|
|
| PUTZKE,JAIR; PEREIRA,ANTONIO B.. |
| ABSTRACT This study presents the description of Phaeosphaeria deschampsii, which was found in plant communities from Half Moon Island, South Shetland Archipelago, Antarctica, in February 2014. Many patches of Deschampsia antarctica (Poaceae), the only indigenous Poaceae specie in Antarctic, were found dead, parasitized by a fungi pathogen. Based on the shape of its perithecia, with oblique neck, erumpent in the grass tissues, ascospore form and septation, the specie was identified as new to science. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antarctica; Ascomycota; Grass; Phytopathology. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501967 |
| |
|
|
| KELLNER,ALEXANDER W.A.; RODRIGUES,TAISSA; COSTA,FABIANA R.; WEINSCHÜTZ,LUIZ C.; FIGUEIREDO,RODRIGO G.; SOUZA,GEOVANE A. DE; BRUM,ARTHUR S.; ELEUTÉRIO,LÚCIA H.S.; MUELLER,CARSTEN W.; SAYÃO,JULIANA M.. |
| Abstract Fossil vertebrates from Antarctica are considerably rare, hampering our understanding of the evolutionary history of the biota from that continent. For several austral summers, the PALEOANTAR project has been carrying out fieldwork in the Antarctic Peninsula in search for fossils, particularly Cretaceous vertebrates. Among the specimens recovered so far are two bones referable to Pterosauria, more specifically to the Pterodacyloidea, the first volant reptiles from Antarctica to be fully described. MN 7800-V (part and counterpart) was recovered from a moraine at the Abernathy Flats (Santa Marta Formation, Lachman Crags Member, Santonian-Campanian) on James Ross Island. It is interpreted as the distal articulation of a first phalanx of the wing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antarctica; Antarctic Peninsula; Pterosauria; PALEOANTAR; Cretaceous. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400519 |
| |
|
|
| PEREIRA,ANTONIO B.; PUTZKE,JAIR. |
| This work aims to summarize the results of research carried out by Brazilian researchers on the plant communities of Antarctic ice free areas during the last twenty five years. Since 1988 field work has been carried out in Elephant Island, King George Island, Nelson Island and Deception Island. During this period six papers were published on the chemistry of lichens, seven papers on plant taxonomy, five papers on plant biology, two studies on UVB photoprotection, three studies about the relationships between plant communities and bird colonies and eleven papers on plant communities from ice free areas. At the present, Brazilian botanists are researching the plant communities of Antarctic ice free areas in order to understand their relationships to soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Scientific publication; Botany; South Shetlands Island; Antarctica. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300923 |
| |
|
| |
|
|
| Santos,Anderson F.; Pires,Fabiano; Jesus,Hugo E.; Santos,André L.S.; Peixoto,Raquel; Rosado,Alexandre S.; D'Avila-Levy,Claudia M.; Branquinha,Marta H.. |
| Two psychrophilic bacterial samples were isolated from King George Island soil, in Antarctica. The phylogenetic analysis based on the 16S rRNA (rrs) gene led to the correlation with the closest related isolates as Sporosarcina aquimarina (99%) and Algoriphagus antarcticus(99%), with query coverage of 99% and 98%, respectively.The spent culture media from both isolates displayed proteolytic activities detected by sodium dodecyl sulfate polyacrylamide gel electrophoresis containing gelatin as protein substrate. Under the employed conditions, S. aquimarina showed a 55 kDa protease with the best activity detected at pH 7.0 and at 27°C. A. antarcticusalso showed a single extracellular protease, however its molecular mass was around 90kDa and its best activity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algoriphagus antarcticus; Antarctica; Sporosarcina aquimarina; Protease. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100109 |
| |
|
|
| Zúñiga-González,Paz; Zúñiga,Gustavo E; Pizarro,Marisol; Casanova-Katny,Angélica. |
| BACKGROUND: Cryptogamic vegetation dominates the ice-free areas along the Antarctic Peninsula. The two mosses Sanionia uncinata and Polytrichastrum alpinum inhabit soils with contrasting water availability. Sanionia uncinata grows in soil with continuous water supply, while P. alpinum grows in sandy, non-flooded soils. Desiccation and rehydration experiments were carried out to test for differences in the rate of water loss and uptake, with non-structural carbohydrates analysed to test their role in these processes. RESULTS: Individual plants of S. uncinata lost water 60 % faster than P. alpinum; however, clumps of S. uncinata took longer to dry than those of P. alpinum (11 vs. 5 h, respectively). In contrast, rehydration took less than 10 min for both... |
| Tipo: Journal article |
Palavras-chave: Antarctica; Antarctic vegetation; Bryophytes; Sugars. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100006 |
| |
|
|
| Mojica-Moncada,Diego F.; Cárdenas,Carlos; Mojica-Moncada,Jhon F.; Brondi,Fabian; Barragán-Barrera,Dalia C.; Marangunic,Cedomir; Holland,David; Franco Herrera,Andrés; Casassa,Gino. |
| ABSTRACT In the western Antarctic Peninsula one of the areas the highest warming in the southern hemisphere has been identified. To characterize this tendency, we selected the Lange Glacier (LG) on King George Island, to evaluate: 1) LG surface temperature and dynamics using stakes with temperature data loggers; 2) LG submerged thickness and sea parameters through bathymetry (BT) and 29 CTD stations in front of LG; 3) glacier front (GF) using BT and a Digital Elevation Model (DEM); 4) change in GF position using DEM and historical data of GF width; 5) Calving flux (QC). Our findings showed 85 % of temperatures were above the 0 °C melting point (mean = 5.0 ± 5.2 °C). The stakes had an average ice loss of 9.3 ± 1.3 cm. The LG mean dynamics was 8.8 ± 1.5 m... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lange Glacier; Melting; Climate change; Calving flux; Antarctica. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300059 |
| |
|
|
| Câmara,Paulo E.A.S; Guedes Costa Silva,Barbara; Carvalho-Silva,Micheline; Knop Henriques,Diego. |
| Located of the east coast of Fildes Peninsula, South of Ardley Island, at King George Island, Ostrov Geologov (Geologist Islands) is a small island with 0.25 miles long. It only had one plant record published so far. We have conducted extensive fieldwork on the site and provide here a comprehensive checklist and a key for the moss species occurring on the island. Despite its small size, theislandcontains about 35% of all theFildes Peninsula moss flora, six new records were found. The pristine state of the island due to its relative isolation, presence of avian nesting sites and a relatively rich moss flora are strong arguments in favor of protection status for the island. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antarctica; Bryophyta; Fildes Peninsula; Moss. |
| Ano: 2017 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722017000200004 |
| |
|
| |
|
|
| Muelbert,Mônica M. C.; Robaldo,Ricardo B.; Martínes,Pablo E.; Colares,Elton P.; Bianchini,Adalto; Setzer,Alberto. |
| In 1999, at-sea activity of two young southern elephant seal males (Mirounga leonina) from Elephant Is. (61º13'S, 55º23'W), Antarctica, was monitored and tracked for 9 months. The individuals were randomly selected, captured, sedated (Zoletil 50®- 1mg/kg), weighed, measured, bled, paint-marked and fitted with satellite tags (STDR - ST-6PPT, Telonics®, USA). Deployment of the STDR took about 45 min since each animal had a lower incisor tooth extracted for age determination. The seals exhibited individual behaviors. Seal "V"-23842 (BM ~ 801kg) moved from Elephant Is. (61.2ºS 55.3ºW) in Jan. 1999 to King George Is. (62.2ºS 58.1ºW) in Feb. 1999 when the tag stopped signaling. Seal "T"-23843 (BM ~ 656 kg) was restricted to the area around Elephant Is. (61.2ºS... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mirounga leonina; Southern elephant seals; Satellite telemetry; Antarctica; At-sea activity. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300017 |
| |
|
| |
|
|
| Vaz,Aline B. M; Rosa,Luiz H; Vieira,Mariana L. A; Garcia,Virginia de; Brandão,Luciana R; Teixeira,Lia C. R. S; Moliné,Martin; Libkind,Diego; van Broock,Maria; Rosa,Carlos A. |
| The diversity of yeasts collected from different sites in Antarctica (Admiralty Bay, King George Island and Port Foster Bay and Deception Island) and their ability to produce extracellular enzymes and mycosporines were studied. Samples were collected during the austral summer season, between November 2006 and January 2007, from the rhizosphere of Deschampsia antarctica, ornithogenic (penguin guano) soil, soil, marine and lake sediments, marine water and freshwater from lakes. A total of 89 isolates belonging to the following genera were recovered: Bensingtonia, Candida, Cryptococcus, Debaryomyces, Dioszegia, Exophiala, Filobasidium, Issatchenkia (Pichia), Kodamaea, Leucosporidium, Leucosporidiella, Metschnikowia, Nadsonia, Pichia, Rhodotorula, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Yeasts; Antarctica; Diversity; Extracellular enzymes; Mycosporines. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300012 |
| |
|
|
| Vásquez-Ponce,Felipe; Higuera-Llantén,Sebastián; Pavlov,María S.; Marshall,Sergio H.; Olivares-Pacheco,Jorge. |
| ABSTRACT Antarctica harbors a great diversity of microorganisms, including bacteria, archaea, microalgae and yeasts. The Pseudomonas genus is one of the most diverse and successful bacterial groups described to date, but only eight species isolated from Antarctica have been characterized. Here, we present three potentially novel species isolated on King George Island. The most abundant isolates from four different environments, were genotypically and phenotypically characterized. Multilocus sequence analysis and 16S rRNA gene analysis of a sequence concatenate for six genes (16S, aroE, glnS, gyrB, ileS and rpoD), determined one of the isolates to be a new Pseudomonas mandelii strain, while the other three are good candidates for new Pseudomonas species.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pseudomonas; Antarctica; P. fluorescens complex; Multilocus Sequence Analysis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400695 |
| |
| Registros recuperados: 78 | |
|
|
|
