Fishery and biological aspects of Euphausia superba on its fishery grounds at the South Shetland Islands and in the Bransfield Strait in March-May, 2006

Abstract Euphausia superba is an abundant element in the marine plankton on the planet. Despite substantial research on this species, there is no comprehensive understanding of the population genetics of E. superba yet. In this study, the ND6 gene was used to assess the genetic variation in E. superba. In the South Shetland Islands, the population of E. superba shows abundant genetic variation, but we found a lack of genetic structure. An analysis of the demographic history suggested that a sudden expansion has been responsible for its high biomass. Our study could not only broaden our comprehension of E. superba, but also provide more scientific information on fisheries resources exploitation, biodiversity conservation and the maintenance of a proper ecological balance.

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Pogonophryne skorai sp. n. (Perciformes: Artedidraconidae), a new species of toadlike plunderfish from the Bransfield Strait and coastal waters of the south Shetland Islands, Antarctica

Russian Journal of Marine Biology ◽

10.1134/s1063074013030048 ◽

2013 ◽

Vol 39 (3) ◽

pp. 190-196 ◽

Cited By ~ 4

Author(s):

A. V. Balushkin ◽

V. V. Spodareva

Keyword(s):

New Species ◽

Coastal Waters ◽

South Shetland Islands ◽

The South ◽

Shetland Islands ◽

Bransfield Strait ◽

A New Species

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Natural iron enrichment around the Antarctic Peninsula in the Southern Ocean

Biogeosciences Discussions ◽

10.5194/bgd-6-7481-2009 ◽

2009 ◽

Vol 6 (4) ◽

pp. 7481-7515 ◽

Cited By ~ 6

Author(s):

M. V. Ardelan ◽

O. Holm-Hansen ◽

C. D. Hewes ◽

C. S. Reiss ◽

N. S. Silva ◽

...

Keyword(s):

Antarctic Peninsula ◽

Weddell Sea ◽

South Shetland Islands ◽

The South ◽

Total Acid ◽

Shetland Islands ◽

Iron Enrichment ◽

Bransfield Strait ◽

Natural Iron ◽

The Antarctic

Abstract. As part of the US-AMLR program that occupied 99 hydrographic stations in the South Shetland Islands-Antarctic Peninsula region in January–February of 2006, concentrations of dissolved iron (DFe) and total acid-leachable iron (TaLFe) were measured in the upper 150 m at 16 stations (both coastal and pelagic waters). The concentrations in the upper mixed layer (UML) of DFe and TaLFe were relatively high in Weddell Sea Shelf Waters (~0.6 nM and 15 nM, respectively) and lowest in Drake Passage waters (~0.2 nM and 0.9 nM, respectively). In the Bransfield Strait, representing a mixture of waters from the Weddell Sea and the Antarctic Circumpolar Current (ACC), concentrations of DFe were ~0.4 nM and of TaLFe ~1.7 nM. The highest concentrations of DFe and TaLFe in the UML were found at shallow coastal stations close to Livingston Island (~1.6 nM and 100 nM, respectively). The ratio of TaLFe:DFe varied with the distance to land: ~45 at the shallow coastal stations, ~15 in the high-salinity waters of Bransfield Strait, and ~4 in ACC waters. Concentrations of DFe increased slightly with depth in the water column, while that of TaLFe did not show any consistent trend with depth. Our data are consistent with the hypothesis that the relatively high rates of primary production known from the central regions of the Scotia Sea are partially sustained by natural iron enrichment resulting from a northeasterly flow of iron-rich coastal waters originating in the South Shetland Islands-Antarctic Peninsula region.

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Two new species of Dorymenia (Mollusca: Solenogastres: Proneomeniidae) from the South Shetland Islands (Antarctica)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400002812 ◽

2000 ◽

Vol 80 (5) ◽

pp. 835-842 ◽

Cited By ~ 1

Author(s):

O. García-Alvarez ◽

V. Urgorri ◽

L. von Salvini-Plawen

Keyword(s):

New Species ◽

Comparative Study ◽

South Shetland Islands ◽

The South ◽

Shetland Islands ◽

Bransfield Strait ◽

Livingston Island ◽

Two New Species ◽

Antarctic Benthos

This paper describes two new species from the genus Dorymenia (Mollusca: Solenogastres: Proneomeniidae): D. hesperidesi sp. nov. and D. menchuescribanae sp. nov., collected during the Spanish oceanographic expeditions for the study of Antarctic benthos, BENTART'94 and BENTART'95, carried out in the area of the Livingston Island (South Shetland Islands, Antarctica). A comparative study of main specific characteristics of species belonging to the genus Dorymenia found off the South Shetland Islands and in the Bransfield Strait (Antarctica), is also included.

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SEISMIC CHARACTERISTICS AND SEDIMENTARY DISTRIBUTION ON THE SOUTH SHETLAND ISLANDS CONTINENTAL MARGIN, ANTARCTICA

Brazilian Journal of Geophysics ◽

10.22564/rbgf.v32i3.509 ◽

2014 ◽

Vol 32 (3) ◽

pp. 549 ◽

Cited By ~ 1

Author(s):

Fabio José Guedes Magrani ◽

Arthur Ayres Neto

Keyword(s):

High Resolution ◽

Continental Margin ◽

South Shetland Islands ◽

Geological Samples ◽

The South ◽

Seismic Profiles ◽

Shetland Islands ◽

Bransfield Strait ◽

Sandy Silt ◽

Seismic Amplitudes

ABSTRACT. This work consists in characterizing the sedimentary distribution of the South Shetland Islands continental margin, Bransfield Strait, Antarctica, throughthe interpretation and correlation of high-resolution seismic profiles and geological samples. The analysis of echo-characters, seismic amplitudes and their correlationwith the collected samples, revealed five different echo types. Echo types I and II have good seismic resolution and are characterized by continuous sharp bottom echoeswith subparallel reflections. Echoes III and IV are characterized by diffuse and very prolonged bottom echoes with no subbottom reflectors. Echo V is associated withglacial deposits on the upper slope in response to deglaciation and transport of coarse grains in a muddy matrix and is characterized by diffraction hyperbolae. Theecho-characters showed good correlation with geological samples collected along the Bransfield Strait and bays of the King George Island, but the correlation with theseismic amplitude map was not as obvious. Echo I shows medium-high amplitudes and samples within its area of occurrence (AM-02 and AM-14) indicate silty sandand sandy silt, respectively. Echo II presents the lowest seismic amplitudes and the sample collected within its area (AM-17) shows approximately 90% mud content.Echoes III and IV, located on the shallowest portions of South Shetland’s continental margin, demonstrate medium-low amplitude values, and are related to samplesAM-01 and AM-04, both classified as sandy silt with approximately 35%sand.Keywords: Bransfield Strait, echo-characters, high-resolution seismic, sedimentary analysis. RESUMO. O presente trabalho consiste na interpretação integrada da sísmica de alta resolução e da amostragem geológica, a fim de caracterizar a geologia de fundona região da margem continental das Ilhas Shetland do Sul, Estreito de Bransfield, Antártica. A caracterização geológica foi realizada através da análise de ecocaráteres, mapas de amplitude sísmica e sua correlação com os sedimentos coletados. Cinco diferentes ecocaráteres foram identificados e classificados. Ecos I e II demonstramboa resolução e são caracterizados por ecos contínuos e nítidos com reflexões subparalelas. Ecos III e IV são caracterizados por ecos difusos, muito prolongados ecom ausência de refletores subparalelos. O Eco V está associado a depósitos glaciais no talude superior, em respostas ao degelo, e ao transporte de grãos grossos em uma matriz mais fina. Além disso, é caracterizado pela presença de hipérboles de difração. Os ecocaráteres mostraram boa correlação com os testemunhos geológicos coletados no Estreito de Bransfield e nas baías da Ilha Rei George, mas não apresentaram uma relação óbvia com o mapa de amplitudes. O Eco I possui amplitudes médio-altas e as amostras contidas em sua área (AM-02 e AM-14) indicam, respectivamente, um conteúdo de areia siltosa e silte arenoso. O Eco II apresenta os menores valores de amplitude com conteúdo de lama (argila + silte) de aproximadamente 90%, conforme a amostra AM-17. Os Ecos III e IV, localizados nas porções mais rasasda margem continental das Shetland do Sul, demonstram valores médio-baixos de amplitude e se relacionam às amostras AM-01 e AM-04, ambas siltes-arenosos com conteúdo de areia de aproximadamente 35%.Palavras-chave: Estreito de Bransfield, ecocaráteres, sísmica de alta resolução, análise sedimentar.

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