SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Coleman, Charles Oliver.

Amathillopsis charlottae n. sp. from the Antarctic Ocean is described herein, the first record of the Amathillopsidae from this region. The new taxon differs from all other known species of this family by the combination of: long carina on pleonite 3, urosomite 1 without carina, accessory flagellum of antenna 1 uniarticulate, mandibular palp article 2 only weakly shorter than 3 and telson entire. The genus Cleonardopsis, formerly classified as Eusiridae, is transfered into Amathillopsidae.

Bivalves Antárticos e Subantárticos coletados durante as Expedições Científicas Brasileiras à Antártica I a IX (1982-1991)

Palavras-chave: Crustacea; Amphipoda; Amathillopsis charlottae n. sp.; Antarctic.

Ano: 1998

URL: http://www.repository.naturalis.nl/record/505339

Zoologia

Narchi,Walter; Domaneschi,Osmar; Passos,Flávio Dias.

The bivalves collected in the Western Antarctic and Subantarctic waters by scientists of the Instituto Oceanográfico - USP during the Scientific Brazilian Expeditions to Antarctical-IX are characterised through its conchiliological features, illustrated and their occurrence plotted in maps. A species of bivalve collected by scuba divers of the IO-USP on the Napier Rock, Admiralty Bay, King George Island during the Expeditions XV and XVI is also considered in this work. The material identified is representative of 25 species distributed among three families and four genera of Protobranchia, three farnilies and five genera of Pteriornorpha, five families and six genera of Heterodonta, and four families and four genera of Anomalo desmata. The main scope of...

Can we generate robust species distribution models at the scale of the Southern Ocean?

Palavras-chave: Bivalvia; Mollusca; Antarctic; Subantarctic; Taxonomy.

Ano: 2002

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300003

Characterization of radionuclides in the marine sediments of Orca Seamount, Admiralty Bay, and Mackellar Cove

Fabri-ruiz, Salomé; Danis, Bruno; David, Bruno; Saucède, Thomas.

Aim Species distribution modelling (SDM) represents a valuable alternative to predict species distribution over vast and remote areas of the ocean. We tested whether reliable SDMs can be generated for benthic marine organisms at the scale of the Southern Ocean. We aimed at identifying the main large‐scale factors that determine the distribution of the selected species. The robustness of SDMs was tested with regards to sampling effort, species niche width and biogeography. Location Southern Ocean. Methods The impact of sampling effort was tested using two sets of data: one set with all presence‐only data available until 2005, and a second set using all data available until 2015 including recent records from campaigns carried out during the Census of...

Tipo: Text

Palavras-chave: Antarctic; Biogeography; Conservation; Echinoidea; Ecological niche; Random forest; Sampling effort; Sub-Antarctic.

Ano: 2019

URL: https://archimer.ifremer.fr/doc/00458/56990/58881.pdf

Boletín de Investigaciones

Poma-Llantoy,Víctor Raul; Mendoza-Hidalgo,Pablo Antonio; Ricaurte-Villota,Constanza.

ABSTRACT Contamination by radioactive elements and their transfer through the trophic chain can have harmful effects on ecosystems and human health, therefore its continuous monitoring is important. The present study aimed to characterize the concentration of radionuclides of natural and anthropogenic origin in marine sediments from three areas in the northwest of Antarctica, Orca Seamount, Admiralty Bay and Mackellar Inlet, in order to evaluate possible risk levels, sources and transportation routes. Measurements were made using a high-resolution Canberra spectrometer and methodological precision and accuracy was assessed by analyzing reference materials certified by the International Atomic Energy Agency (IAEA), SOIL-6 and Moss SOIL-447. The results...

URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300109

Palavras-chave: 137Cs; 40K; Antarctic; Radioactive contamination; Radiation monitoring..

Ano: 2021

Ecophysiology of Antarctic macroalgae: effects of environmental light conditions on photosynthetic metabolism

RChHN

GÓMEZ,I..

Daylength is the major environmental factor affecting the seasonal photosynthetic performance of Antarctic macroalgae. For example, the "season anticipation" strategy of large brown algae such as Ascoseira mirabilis and Desmarestia menziesii are based on the ability of their photosynthetic apparatus to make use of the available irradiance at increasing daylengths in late winter-spring. The seasonal development and allocation of biomass along the lamina of A. mirabilis are related to a differential physiological activity in the plant. Thus, intra-thallus differentiation in O2-based photosynthesis and carbon fixation represents a morpho-functional adaptation that optimizes conversion of radiant energy to primary productivity. In Desmarestia menziesii,...

Tipo: Journal article

Palavras-chave: Polar macroalgae; Antarctic; Photosynthesis; Daylength.

Ano: 2001

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200004

Elements for a revision and notes on bionomy of the Cumacea (Crustacea: Peracarida) of the Weddell Sea (Antarctica). : Material collected by the Expedition ANTARKTIS-VIII/5 of R.V. “Polarstern” 1989/90

Petrescu, I.; Wittmann, K.J..

Among 26 species of Antarctic Cumacea sampled during the southern summer 1989/90 from benthic habitats in the Weddell Sea, four are described as new to science: Campylaspis ledoyeri spec. nov., Hemilamprops bacescui spec. nov., Paralamprops racovitzai spec. nov., and Leptostylis weddelli spec. nov. Detailed descriptions are given for the previously unknown or undescribed sex in seven species: Cyclaspis gigas Zimmer, 1907, Procampylaspis compressa Zimmer, 1907, Paralamprops asper Zimmer, 1907, P. mawsoni (Hale, 1937), Diastylis anderssoni armata Ledoyer, 1993, D. mawsoni Calman, 1918, and Leptostylis antipus Zimmer, 1907. Previous descriptions are supplemented by additional morphological data on 14 species: Cyclaspis gigas, Vaunthompsonia inermis Zimmer,...

Epimeria heldi, a new species of Amphipoda (Crustacea, Epimeriidae) from the Antarctic Ocean

Palavras-chave: Crustacea; Cumacea; Taxonomy; New species; Morphology; Bionomy; Antarctic; Marine benthos; 42.74.

Ano: 2003

URL: http://www.repository.naturalis.nl/record/216173

Coleman, Charles Oliver.

The new amphipod species Epimeria heldi is described. It differs from all known eperimiids in the following combination of characters: apically rounded coxae 1-3, the characteristic sculptured coxal plate 4, the narrow basis 7 and uropod 3 rami apically rounded. The body colour of the living animal is grey, with dark red mouthparts and appendages, and yellow eyes.

Expédition OceanoScientific 2016-2017 : Etudes des mesures de température et de salinité de surface

Palavras-chave: Crustacea; Amphipoda; Antarctic; Epimeria heldi n. sp.

Ano: 1998

URL: http://www.repository.naturalis.nl/record/504687

High-resolution topography for Digital Terrain Model (DTM) in Keller Peninsula, Maritime Antarctica

Reynaud, Thierry; Reverdin, Gilles; Metzl, Nicolas; Griboval, Yvan.

The OceanoScientific Programm was initiated in 2006 and yielded the creation of a specific equipment : the OSC-System. The OSC-System measures physical parameters at the air-sea interface including Sea Surface temperature and Salinity. An OSC-System was installed on board of the OceanoScientific Explorer Boogaloo sailing ship. A cruise around the world was initiated the 17/11/2016 and ended 02/06/2017 including 60 days south of 40°S. Sea Surface temperature and salinity collected along this cruise are discussed in this technical report.

Tipo: Text

Palavras-chave: Mesures; Température; Salinité; Surface; Oceanoscientific; Boogaloo; Antarctique; Temperature; Salinity; SST; SSS; Measurements; Antarctic.

Ano: 2018

URL: https://archimer.ifremer.fr/doc/00472/58356/60914.pdf

Anais da ABC (AABC)

SCHÜNEMANN,ADRIANO L.; ALMEIDA,PEDRO HENRIQUE A.; THOMAZINI,ANDRÉ; FERNANDES FILHO,ELPÍDIO I.; FRANCELINO,MÁRCIO R.; SCHAEFER,CARLOS E.G.R.; PEREIRA,ANTONIO BATISTA.

Abstract High resolution topography (HRT) surveys is an important tool to model landscapes, especially in zones subjected to strong environmental changes, such as Antarctica, where landform is highly influenced by cryoclasty and permafrost melting. The aim of this work was to obtain a high accurate DTM for Keller Peninsula, Maritime Antarctica. The survey study was assessed in the 2014/2015 and 2015/2016 during the austral summer, by using Terrestrial Laser Scanner (TLS). In order to cover 8 km² of the Peninsula, the TLS equipment was installed in 81 different points. Results of the DTM generated by TLS (hereafter, HRT-DTM), and the terrain variables Aspect, Slope and Hillshade obtained were compared with previous models generated by aerophotographic...

Influence of snow depth and surface flooding on light transmission through Antarctic pack ice

Palavras-chave: Terrestrial laser scanner; Remote sensing; Geomorphology; Antarctic.

Ano: 2018

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502001

Interannual variations in euphausiid life stage distribution in the Dumont d'Urville Sea from 2004 to 2008

Arndt, Stefanie; Meiners, Klaus M.; Ricker, Robert; Krumpen, Thomas; Katlein, Christian; Nicolaus, Marcel.

Snow on sea ice alters the properties of the underlying ice cover as well as associated physical and biological processes at the interfaces between atmosphere, sea ice, and ocean. The Antarctic snow cover persists during most of the year and contributes significantly to the sea-ice mass due to the widespread surface flooding and related snow-ice formation. Snow also enhances the sea-ice surface reflectivity of incoming shortwave radiation and determines therefore the amount of light being reflected, absorbed, and transmitted to the upper ocean. Here, we present results of a case study of spectral solar radiation measurements under Antarctic pack ice with an instrumented Remotely Operated Vehicle in the Weddell Sea in 2013. In order to identify the key...

Tipo: Text

Palavras-chave: Light transmittance; Sea ice; Antarctic; Surface flooding; Snow; Shortwave radiation.

Ano: 2017

URL: http://archimer.ifremer.fr/doc/00386/49758/50279.pdf

Vallet, Carole; Labat, Jean-philippe; Smith, Martina; Koubbi, Philippe.

Euphausiid larvae were caught by oblique tows of a double-framed bongo net at 118 stations along the coast of Terre Adelie during every summer from 2004-2008. Larvae of Euphausia crystallorophias Holt and Tattersall and Thysanoessa macrura G.O. Sars were observed in the study area every year in contrast to larvae of Euphausia superba which were absent during the entire period of sampling. Highest abundances of both species were observed during the summer of 2005 and the lowest in the summer of 2004. Larvae of E. crystallorophias dominated every year and comprised more than 80% of the total abundance of euphausiid larvae. Within species, the calyptopis stages especially calyptopis 1 of E. crystallorophias dominated compared to furcilia stages of T. macrura...

Tipo: Text

Palavras-chave: Euphausia crystallorophias; Thysanoessa macrura; Antarctic; Abundance; Spatial distribution; Environmental factors.

Ano: 2011

URL: https://archimer.ifremer.fr/doc/00227/33829/32464.pdf

Isolation and molecular characterization of Thraustochytrium strain isolated from Antarctic Peninsula and its biotechnological potential in the production of fatty acids

BJM

Caamaño,Esteban; Loperena,Lyliam; Hinzpeter,Ivonne; Pradel,Paulina; Gordillo,Felipe; Corsini,Gino; Tello,Mario; Lavín,Paris; González,Alex R..

ABSTRACT Thraustochytrids are unicellular protists belonging to the Labyrinthulomycetes class, which are characterized by the presence of a high lipid content that could replace conventional fatty acids. They show a wide geographic distribution, however their diversity in the Antarctic Region is rather scarce. The analysis based on the complete sequence of 18S rRNA gene showed that strain 34-2 belongs to the species Thraustochytrium kinnei, with 99% identity. The total lipid profile shows a wide range of saturated fatty acids with abundance of palmitic acid (16:0), showing a range of 16.1-19.7%. On the other hand, long-chain polyunsaturated fatty acids, mainly docosahexaenoic acid and eicosapentaenoic acid are present in a range of 24-48% and 6.1-9.3%,...

Marine photosynthetic eukaryotes in polar systems: Unveiling phytoplankton diversity and composition in Antarctic waters

Palavras-chave: Thraustochytrids; Antarctic; Docosahexaenoic acid; Eicosapentaenoic acid; Temperature.

Ano: 2017

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000400671

RChHN

DE LA IGLESIA,RODRIGO; TREFAULT,NICOLE.

Antarctic waters are a particular marine environment mainly due to the strong seasonal variations that various parameters are subject to, like light availability and temperature. As in all oceanographic regions, food webs are sustained by photosynthetic microorganisms, which in the case of Antarctic environments seem to be strongly dominated by its eukaryote component. Assessing the ecological role of photosynthetic microbial eukaryotes requires a basic knowledge of their diversity and community composition. This review integrates the available information regarding this component of Antarctic phytoplankton as a way to unveil its diversity and how they respond to the strong changes that occur in this environment. Although several studies indicate the...

Tipo: Journal article

Palavras-chave: Antarctic; Biodiversity; Photosynthetic eukaryotes; Phytoplankton; Antártica; Biodiversidad; Eucariontes fotosintéticos; Fitoplancton.

Ano: 2012

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400006

Modeling Distribution and Abundance of Antarctic Baleen Whales Using Ships of Opportunity

Ecology and Society

Williams, Rob; Sea Mammal Research Unit; rmcw@st-andrews.ac.uk; Hedley, Sharon L.; University of St. Andrews; slc@st-andrews.ac.uk; Hammond, Philip S.; University of St. Andrews; psh2@st-andrews.ac.uk.

Information on animal abundance and distribution is at the cornerstone of many wildlife and conservation strategies. However, these data can be difficult and costly to obtain for cetacean species. The expense of sufficient ship time to conduct design-unbiased line transect surveys may be simply out of reach for researchers in many countries, which nonetheless grapple with problems of conservation of endangered species, by-catch of small cetaceans in commercial fisheries, and progression toward ecosystem-based fisheries management. Recently developed spatial modeling techniques show promise for estimating wildlife abundance using non-randomized surveys, but have yet to receive much field-testing in areas where designed surveys have also been conducted....

Tipo: Peer-Reviewed Reports

Palavras-chave: Abundance; Antarctic; Baleen whale; Cetacean; Distance sampling; Distribution; Line transect; Platform of opportunity; Spatial model.

Ano: 2006

On Clathrozoellidae (Cnidaria, Hydrozoa, Anthoathecatae), a new family of rare deep-water leptolids, with the description of three new species

Peña Cantero, A.L.; Vervoort, W.; Watson, E.J..

Three new species of Anthoathecatae (Cnidaria, Hydrozoa) of the rare genus Clathrozoella Stechow, 1921, Clathrozoella abyssalis spec. nov., C. bathyalis spec. nov. and C. medeae spec. nov., are described from New Zealand and Antarctic waters. Along with the previously known C. drygalskii (Vanhöffen, 1910) the genus Clathrozoella now numbers four species. Details of the skeleton, hydranths, nematocysts and gonophores are described and discussed, as is also the position of the newly established family Clathrozoellidae.

On Oswaldella billardi Briggs, 1938 and O. erratum spec, nov., two antarctic hydroid species (Cnidaria, Hydrozoa)

Palavras-chave: Hydrozoa; Anthoathecatae; Clathrozoellidae; Clathrozoella; Antarctic; Benthos; New species; 42.79.

Ano: 2003

URL: http://www.repository.naturalis.nl/record/220315

Peña Cantero, A.L.; Vervoort, W..

The type material of Oswaldella billardi Briggs, 1938, has been re-examined and a complete description and figures are presented. The study of that material has allowed to reconsider the systematic position of all the material previously assigned to O. billardi and to determine that part of it belongs to another species. Since it is clearly different from the remaining species of the genus, it is described as Oswaldella erratum spec. nov. Resumen: Se ha revisado y redescrito el material tipo de Oswaldella billardi Briggs, 1938. Su estudio ha permitido reconsiderar la posición sistemática de todo el material anteriormente asignado a O. billardi y, así, determinar que parte del mismo pertenece a otra especie. Ya que dicha especie es claramente diferente de...

On two Antarctic species of Oswaldella Stechow, 1919: O. shetlandica Stepan'yants, 1979 and O. elongata spec. nov. (Cnidaria Hydrozoa) (Notes on Antarctic hydroids, II)

Palavras-chave: Cnidaria; Hydrozoa; Hydroids; Oswaldella; New species; Antarctic; 42.72.

Ano: 1997

URL: http://www.repository.naturalis.nl/record/318245

Peña Cantero, A.L.; García Carrascosa, A.M.; Vervoort, W..

Two species of the antarctic hydroid genus Oswaldella Stechow, 1919, are considered. The first, described by Stepan'yants (1979) as a subspecies, O. billardi shetlandica, has been raised to specific level and will henceforth be indicated as Oswaldella shetlandica Stepan'yants, 1979. A second species is described as Oswaldella elongata spec. nov. Both species are differentiated against the remaining known species of Oswaldella; new records are added and the geographical distribution is discussed. Resumen: Se considera la posición sistemática de dos especies del género Oswaldella Stechow, 1919. Una de ellas, descrita por Stepan'yants (1979) como una subespecie de Oswaldella billardi Briggs, 1938, es elevada al nivel específico y pasa a denominarse Oswaldella...

On two new species of Oswaldella Stechow, 1919: O. terranovae spec. nov. and O. tottoni spec. nov. (Cnidaria: Hydrozoa). Notes on Antarctic hydroids, III

Palavras-chave: Cnidaria; Hydrozoa; Hydroids; Antarctic; New records; New species; 42.72.

Ano: 1995

URL: http://www.repository.naturalis.nl/record/318391

Peña Cantero, A.L.; Vervoort, W..

The material assigned by Totton (1930) to Oswaldella antarctica (Jaderholm, 1904) and O. bifurca (Hartlaub, 1904) has been re-examined and redescribed. This material shows such important differences with Hartlaub's and Jäderholm's species and the remaining species of Oswaldella that they are here considered as two new species: O. terranovae spec. nov. and O. tottoni spec, nov., respectively.

Redescription of Echinomunna horrida Vanhöffen, 1914, a highly derived and rare species from the Antarctic (Crustacea, Isopoda, Munnidae)

Palavras-chave: Cnidaria; Hydrozoa; Hydroids; Oswaldella; New species; Antarctic; 42.72.

Ano: 1996

URL: http://www.repository.naturalis.nl/record/319412

Brandt, Angelika.

During an expedition with RV Polarstern (1998) a male specimen of Echinomunna horrida was collected in the supranet of an epibenthic sledge in the Weddell Sea, Antarctica. Due to an incomplete and poor description by Vanhöffen (1914) a redescription is necessary on the basis of the male from the Weddell Sea and the female syntypes from the East Antarctic.

Redescription of Oswaldella antarctica (Jäderholm, 1904) (Cnidaria Hydrozoa) with notes on related species (Notes on Antarctic hydroids, I)

Palavras-chave: Crustacea; Isopoda; Munnidae; Taxonomy; Weddell Sea; Antarctic.

Ano: 1999

URL: http://www.repository.naturalis.nl/record/505320

Peña Cantero, A.L.; Vervoort, W..

Jäderholm's type of Schizotricha antarctica, collected by the Swedish Antarctic Expedition 1901-1903, is redescribed from a syntype in the collections of the Swedish National Museum, Stockholm. The type lot of that species proved to be composite, the material best resembling Jäderholm's (1904, 1905) descriptions and figures has been designated as the syntype. There are two more species in the type lot, that have also been described, but are too poorly represented to be either recognized as one of the described species of Oswaldella or to merit a new specific name; they have been indicated as Oswaldella spec. 1 and spec. 2. Resumen: Se ha revisado y redescrito el material tipo de Schizotricha antarctica Jäderholm, 1904, recogido durante la Swedish Antarctic...