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

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

doi:10.1590/s0101-81752002000300003

Cited by 17 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Algal rafting represents an effective dispersal mechanism for species living on algae (e. g. Gaimardia trapesina and some species of Philobrya), which distribute eastward following the West Wind Drift. Additionally, transport by fishes has been reported as a dispersal mechanism: Rochefortia charcoti, withstanding passage through the digestive tract of fishes, is passively dispersed in Antarctic environments (Domaneschi et al, 2002). Above all, the West Wind Drift could be potentially contributing to the distribution of species having a planktonic larval stage, a condition so far only reported for a few Antarctic bivalves (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The fauna of the South Orkney Islands was studied by the Scottish National Antarctic Expedition (Melvill and Standen, 1907), from the R/V "Polarstern" and R/V "Walther Herwig" cruises (Mühlenhardt-Siegel, 1989). Preston (1916), Soot-Ryen (1951), Arnaud et al (1986), Mühlen-hardt-Siegel (1989), Arnaud et al (2001), andNarchi et al (2002) contributed to the knowledge of the fauna from the South Shetland Islands. Carcelles (1953) and Powell (1960) provided checklists of the Antarctic bivalves (including the Scotia Arc islands), but subsequent studies conducted in Antarctic waters (Dell, 1964(Dell, , 1990Hain, 1990; this study) strongly suggest that the information contained in published lists needs to be revised.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The bivalves from the Scotia Arc islands: species richness and faunistic affinities

Zelaya¹

2005

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: Species richness of the shallow-water bivalves from the Scotia Arc islands was studied on the basis of new collections and by reviewing extant information. Seventy-three species are recognised from the entire area. South Georgia, the South Orkney Islands and the South Shetland Islands were similar in species richness to the Antarctic Weddell sector. New records for 51 bivalve species are provided and the presence of 18 undescribed species is reported. The faunistic similarity of the islands of the Scotia Arc to the Magellan region and the Antarctic Weddell sector is re-examined. These islands show a high similarity to the Antarctic Weddell sector (49 to 85%) and a low similarity to the Magellan region (12 to 32%). Evidence from bivalves clearly supports the placement of the Scotia Arc islands within the Antarctic region.Keywords: diversity, biogeography, molluscs, Bivalvia, Scotia Sea, Antarctic. RESUMEN: DIVERSIDAD Y SIMILITUDES FAUNÍSTICAS DE LOS BIVALVOS DE LAS ISLAS DEL ARCO DESCOTIA. -La diversidad de bivalvos que habitan en las aguas someras del Arco de Scotia fue estudiada sobre la base de recientes colecciones desarrolladas en el área y por la revisión de la información preexistente. Un total de 73 especies fueron reconocidas para el área; el número de especies hallado en las islas Georgias del Sur (49), Orcadas del Sur (43) y Shetland del Sur (42) resultó similar al actualmente conocido para el cuadrante antártico de Weddell (41 especies). Se proporcionan nuevas citas para 51 especies de bivalvos y se informa sobre la existencia de 18 especies aún no descriptas. Las similitudes faunísticas de las islas del Arco de Scotia con la región magallánica y con el cuadrante antártico de Weddell fueron reanalizadas. Estas islas mostraron una elevada similitud con el cuadrante antártico de Weddell (49 a 85%, dependiendo del archipiélago) y una baja similitud respecto a la región magallánica (12 a 32%). Las evidencias procedentes de los bivalvos claramente soportan el emplazamiento de las islas del Arco de Scotia dentro de la región antártica.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The bivalves from the Scotia Arc islands: species richness and faunistic affinities

Zelaya¹

2005

Sci. Mar.

View full text Add to dashboard Cite

show abstract

“…Other species of this genus are widely distributed in the tropical and subtropical Indo-Pacific, with only one species in the cold waters of South Australia and Tasmania and none in South Africa, New Zealand and South America (Dell 1972). Laternula elliptica can be found in the shallow sheltered coastal waters (depths > 1m) down to 500m depth (Dell 1990, Narchi et al 2002, but is more common between 15 to 45m, as in the case of King George Island (Nonato et al 2000). This bivalve occurs often in dense patches and densities can reach values as much as 80 per m 2 in shallow subtidal regions (Ahn et al 1996, Ansell & Harvey 1997, Lohan et al 2001.…”

Section: Life History and Ecophysiology Of Laternula Ellipticamentioning

confidence: 99%

NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE Laternula elliptica (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER

2007

View full text Add to dashboard Cite

The Antarctic marine environment is characterized by the extreme seasonality of the primary production in the water column and the low but stable temperatures. Both are considered the main factors in the adaptative evolution of Antarctic ectothermic organisms. Studies about physiological and biochemical processes of the cold-adapted species revealed the presence of antifreeze glycoproteins in the biological fluids and cold-adapted proteins. The low and stable temperatures have resulted in the appearence of enzymes with high catalytic efficiency and the absence of the thermal stress proteins in some Antarctic fishes. The austral winter promotes a seasonal food shortage, submitting the benthic ectotherms to long periods of starvation. This is particularly true for the organisms that depend on phytoplankton as their primary source of food. The Antarctic marine environment also presents areas of high copper concentrations on the sediment surface as well as cadmium in the water column. The bivalve Laternula elliptica, a circumpolar species, has been proposed as bioindicator for long term monitoring of heavy metals in the shallow waters of Antarctica due to its capacity to accumulate metals, especially cadmium and zinc. Like other Antarctic ectothermic organisms, L. elliptica changes its metabolism from aerobic to anaerobic as a function of temperature, being 6 ºC critical and 9 ºC lethal. This bivalve also shows a marked seasonality in its metabolism, with low oxygen consumption in winter as compared to summer. It is speculated that it enters into a dormancy state during the austral winter as it apparently retracts its siphons below the sediment surface. The apparent supression of the water pumping by the siphons during winter forces L. elliptica to mobilize its energy reserves, using the siphon proteins as its principal source of energy (ratio of oxygen consumption/excreted nitrogen = 3.0). Even during summer, when the high food supply stimulates the bivalve growth, the metabolism is mainly protein based. (O:N ratio = 16). The excretory nitrogen metabolism of this bivalve is typically ammoniotelic, characterized by the excretion of almost 90% of nitrogen in the form of ammonia and 10% as urea. Probably, the urea excreted arises from the hydrolysis of the proteic aminoacid L-arginine by arginase in order to maintain the tissue levels of that aminoacid. In such case, the presence of this enzyme in the kidney tissues may be related to the physiological constraints caused by the retraction of the siphons and the requirements for the excretion of this nitrogen compound during the austral winter. Studies with the renal arginase of this bivalve showed a high metabolic tolerance to the metallic cations Cu, Zn, Fe and Cd, when compared to the arginase behavior of other bivalves such as Dreissena polymorpha. The present work covers the life history of this bivalve, its potential use as a biomarker and its adaptations to the extreme marine environment conditions in Antarctica. Key-words: Antarctica, benthos, Laternula ...

show abstract

“…Beginning with the first Brazilian expeditions, many molluscs have been collected from this location, and brought for identification by the malacologists of the Instituto de Biociências da Universidade de São Paulo (IBUSP), coordinated by the late Prof. Walter Narchi (Narchi et al 2002). Investigations on the biology and anatomy of bivalves were continued by Prof. Osmar Domaneschi and his students (Narchi et al 2002, Passos et al 2005, Sartori et al 2006, who gathered a rich bibliography on these animals, especially on their taxonomy.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the Bivalvia (Mollusca) from the continental shelves of Antarctica and Brazil

Passos

Magalhães

2011

Biota Neotrop.

Self Cite

View full text Add to dashboard Cite

comparative study of the Bivalvia (Mollusca) from the continental shelves of Antarctica and Brazil. Biota Neotrop. 11(1): http://www.biotaneotropica.org.br/v11n1/en/ abstract?article+bn02211012011.Abstract: During identification of bivalve molluscs collected in Antarctica, a rich taxonomic bibliography was gathered, stimulating comparisons with the Brazilian malacofauna. We listed a total of 68 and 368 known shallow-water species (less than 200 m depth) from Antarctica and Brazil, respectively, in order to find species, families and superfamilies in common, and to investigate how these malacofaunas differ in regard to these representative groups and their life habits. There are 23 superfamilies absent in Antarctica, but present in Brazil with at least one species; the reverse does not occur, as all superfamilies known from Antarctica are also recorded from Brazil. The number of Brazilian species is higher, being composed of a mixture of taxa from different biogeographical provinces, whereas in Antarctica there are only a few species adapted to its polar conditions, with minor components from elsewhere. Thus, many typical Caribbean species extend into Brazil, belonging to the diverse Arcoidea, Pectinoidea, Lucinoidea, Cardioidea, Veneroidea, and Tellinoidea. Cemented Ostreoidea, Plicatuloidea, Dimyoidea, Spondylidae (Pectinoidea), and Chamoidea are absent from Antarctica, as are wood (Teredinidae, Pholadoidea) and rock borers (Pholadidae, Pholadoidea; Gastrochaenoidea; and Lithophaginae, Mytiloidea). A large number of Brazilian species of infaunal (e.g., Tellinidae, Veneridae, Cardiidae, and Mactroidea) and epifaunal groups (Pectinidae, Mytilidae, and Arcidae) are absent from or poorly represented in Antarctica. Nuculanoidea, Limopsoidea, Lucinoidea, Galeommatoidea, Cyamioidea, and Cuspidarioidea are the richest groups in Antarctica; some of them are also represented by several species in Brazil, albeit in deeper waters. Three species are recorded as living in both places: Limatula pygmaea (Limidae), Lasaea adansoni (Lasaeidae), and Gaimardia trapesina (Gaimardiidae). Through the analysis of these groups from each fauna, it is possible to identify those that are taxonomically diverse in one place or another, and then emphasize them in ecological studies, eventually using them as model or monitoring organisms. The present paper can be a starting point for future discussion on the existing latitudinal gradients along the coast of eastern South America, stimulating studies on changes occurring in the composition of the faunas of bivalves from Brazil, Uruguay, Argentina, and Antarctica. Resumo: Durante a identificação de moluscos bivalves coletados na Antártica, foi reunida uma rica bibliografia taxonômica, estimulando comparações com a malacofauna do Brasil. Assim, listamos um total de 68 espécies conhecidas para águas rasas (menos de 200 m de profundidade) da Antártica e 368 para o Brasil, procurando encontrar espécies, famílias e superfamílias em comum a ambos os locais, e investigando em que essas malacofaunas di...

show abstract

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

Cited by 17 publications

References 3 publications

The bivalves from the Scotia Arc islands: species richness and faunistic affinities

The bivalves from the Scotia Arc islands: species richness and faunistic affinities

NITROGEN METABOLISM OF THE ANTARCTIC BIVALVE Laternula elliptica (KING & BRODERIP) AND ITS POTENTIAL USE AS BIOMARKER

A comparative study of the Bivalvia (Mollusca) from the continental shelves of Antarctica and Brazil

Contact Info

Product

Resources

About