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

Zelaya, Diego G.

doi:10.3989/scimar.2005.69s2113

Cited by 35 publications

(26 citation statements)

References 25 publications

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“…Other studies conducted in Southern Thule have shown a similar pattern for other taxa and found impoverished diversity for isopods (Brandt 1991), bryozoans (López de la Cuadra and García Gómez 2000;Moyano 2005), bivalves and gastropods (Zelaya 2005;Linse et al 2006), and malacostracan crustaceans , suggesting that the local environmental conditions exert a strong influence on all benthos. However, the large number of rare species (singletons) taken into account by the Chao1 estimator suggest that total species richness of Southern Thule shelf could ultimately be high for polychaetes (Table 4) making it in fact a potentially high biodiversity site if future sampling effort was increased.…”

Section: Sites With Low Biodiversitysupporting

confidence: 66%

Comparative marine biodiversity and depth zonation in the Southern Ocean: evidence from a new large polychaete dataset from Scotia and Amundsen seas

et al. 2017

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Based on a dataset of 16,991 and 307 morphospecies of polychaete worms collected from 58 epibenthic sledge deployments across the Scotia and Amundsen Seas, we show that the structures of their shelf, deep-shelf and slope communities are composed of distinct polychaete assemblages spanning regions with Bhigh^, Bintermediate^, and Blow^biodi-versity. Depth has been identified as the main factor structuring the polychaete communities in both seas, countering the prevalent notion of extended eurybathy of the Southern Ocean benthos. From an evolutionary perspective, this strong dissimilarity between shelf and slope fauna could be interpreted as evidence for survival in shelf refugias, rather than migration into deeper waters during glacial maxima. The previously unsampled Amundsen Sea is shown to be diverse, harbouring a high level of taxonomic novelty, with many species new to science. The polychaete community of the inner shelf in the Amundsen Sea (Pine Island Bay) has also been shown to be of deep-sea character, likely due to intrusion of the Circumpolar Deep Water onto the shelf. In the Scotia Sea, our data support the notion of relatively high biodiversity of waters around the South Orkney Islands, South Georgia, and Shag Rocks (all recently established as Marine Protected Areas) and depressed diversity in the extreme environment of Southern Thule.

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Section: Sites With Low Biodiversitysupporting

confidence: 66%

Comparative marine biodiversity and depth zonation in the Southern Ocean: evidence from a new large polychaete dataset from Scotia and Amundsen seas

et al. 2017

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“…), contrasting with their complete absence in Antarctica. Within the American Quadrant, Macoma georgiana Dell, 1964 is the tellinoidean with the most southerly distribution, reaching South Georgia (Zelaya 2005), but not extending into the Scotia Arc and the Antarctic Peninsula. For the Veneroidea, three species are found in Patagonia and probably in the Falklands, but not in Antarctica: Eurhomalea exalbida (Dillwyn, 1817), Gomphina foveolata (Cooper & Preston, 1910), and Protothaca antiqua (King & Broderip, 1832).…”

Section: Discussionmentioning

confidence: 99%

“…Family Pectinidae: Adamussium colbecki (Smith, 1902); Family Propeamussiidae: Cyclochlamys gaussianus (Thiele, 1912) and Cyclopecten pteriola (Melvill & Staden, 1907 (Lamy, 1910), Parathyasira dearborni (Nicol, 1965), Axinulus antarcticus Zelaya, 2010, and Genaxinus debilis Thiele, 1912[Observation: Nicol (1966 and Hain (1990) referred G. debilis to G. bongraini, andZelaya (2005) noted that its presence is "uncertain" for South Georgia, South Orkneys, and the South Shetlands islands; Family Lasaeidae: Lasaea consaguinea (Smith, 1877), Lasaea adansoni (Gmelin, 1791), Mysella minuscula (Pfeffer, 1886), Mysella charcoti (Lamy, 1906), Mysella gibbosa (Thiele, 1912), Mysella narchii , Mysella antarctica (Smith, 1907, Montacuta nimrodiana (Hedley, 1911) Family Gaimardiidae: Kidderia subquadratum (Pelseneer, 1903) and Gaimardia trapesina (Lamarck, 1819); F a m i l y C y a m i i d a e : C y a m i o m a c t r a l a m i n i f e r a (Lamy, 1906), Cyamiocardium denticulatum (Smith, 1907), Cyamiocardium crassilabrum Dell, 1964, andPtychocardia vanhoeffeni Thiele, 1912; Family Neoleptonidae: Neolepton parasiticum (Dall, 1876). Family Poromyidae: Poromya adelaidis (Hedley, 1916).…”

Section: Species From Antarcticamentioning

confidence: 99%

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

Passos

Magalhães

2011

Biota Neotrop.

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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...

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“…According to Osorio & Reid (2004), it is found from Seno de Reloncaví to Magellan. The Atlantic coast and islands surrounding the Antarctic (Zelaya 2005). From 27 to 1674 m depth (Dell 1990).…”

Section: Subclass Pteriomorphiamentioning

confidence: 99%

“…Cyclocardia compressa: Soot-Ryen, 1959Bernard, 1983: 34;Ramírez, 1993: 151, fig. 148 (Zelaya 2005), from 3-120 m (Ramírez 1993) to 20-208 m depth (Osorio & Reid 2004). Smith, 1881 (Fig.…”

Section: Mytilus Edulis Chilensismentioning

confidence: 99%

Chilean Marine Mollusca of Northern Patagonia Collected During the Cimar-10 Fjords Cruise

Cárdenas¹,

Aldea

Valdovinos

2008

Gayana (Concepc.)

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The tip of the South American cone is one of the most interesting Subantarctic areas, both biogeographically and ecologically. Nonetheless, knowledge of the area's biodiversity, in particular that of the subtidal marine habitats, remains poor. Therefore, in 2004, a biodiversity research project was carried out as a part of the cruise Cimar-10 Fjords, organized and supported by the Chilean National Oceanographic Committee (CONA). The results of the subtidal marine mollusk surveys are presented herein. The samples were collected aboard the Agor 60 "Vidal Gormaz" in winter 2004. The study area covered the northern Chilean Patagonia from Seno de Relocanví (41º31'S) to Boca del Guafo (43º49'S), on the continental shelf from 22 to 353 m depth. The Mollusca were collected at 23 sampling sites using an Agassiz trawl. In total, 67 species were recorded: 4% Polyplacophora (Leptochitonidae, Ischnochitonidae), 58% Gastropoda (Lepetidae, Fissurellidae, Trochidae, Turbinidae, Calyptraeidae, Capulidae, Naticidae, Ranellidae, Cerithiopsidae, Epitoniidae, Muricidae, Buccinidae, Columbellidae, Nassariidae, Volutidae, Cancellariidae, Turridae, Pyramidellidae, Acteonidae, Chilinidae), 36% Bivalvia (Nuculidae, Yoldiidae, Malletiidae, Tindariidae, Limopsidae, Phylobryidae, Mytilidae, Pectinidae, Propeamussidae, Lucinidae, Thyasiridae, Neoleptonidae, Carditidae, Condylocardiidae, Veneridae, Tellinidae, Lyonsiidae, Pandoridae, Cuspidariidae), and 1% Scaphopoda (Rhabdidae). Our results show a high proportion of southern (Magellanic) subtidal species; 45 species (67%) are strictly Magellanic or Antarctic and another 16 (24%) were widespread species, with distributions extending to the south of our study area. Only six species (9%) were strictly Peruvian.KEYWORDS: Biodiversity, taxonomy, South America, fjords, Polyplacophora, Gastropoda, Bivalvia, Scaphopoda. RESUMENEl extremo sur de Sudamérica representa una de las áreas subantárticas más interesantes desde un punto de vista ecológico y biogeográfico. A pesar de ello, el conocimiento que se tiene sobre la biodiversidad del área, y en particular de los hábitats marinos submareales, es relativamente pobre. En el año 2004 se realizó un proyecto de investigación sobre biodiversidad como parte del crucero Fiordos Cimar-10, organizado y financiado por el Comité Oceanográfico Nacional de Chile (CONA). En este artículo se describen los resultados obtenidos sobre de los moluscos submareales.Las muestras fueron obtenidas en el invierno del 2004, a bordo del buque Agor 60 "Vidal Gormaz". El área de estudio se localizó en el extremo norte de la Patagonia chilena, desde el Seno de Relocanví (41º31'S) hasta la Boca del Guafo (43º49'S), en la plataforma continental comprendida entre 22 y 353 m de profundidad. Los moluscos fueron recolectados en 23 estaciones de muestreo empleando una rastra Agassiz. Se registró un total de 67 especies, consistentes en 4% Polyplacophora (Leptochitonidae, Ischnochitonidae), 58% Gastropoda (Lepetidae, Fissurellidae, Trochidae, Turbinidae, Calyptraeidae, Capulidae,...

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

Cited by 35 publications

References 25 publications

Comparative marine biodiversity and depth zonation in the Southern Ocean: evidence from a new large polychaete dataset from Scotia and Amundsen seas

Comparative marine biodiversity and depth zonation in the Southern Ocean: evidence from a new large polychaete dataset from Scotia and Amundsen seas

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

Chilean Marine Mollusca of Northern Patagonia Collected During the Cimar-10 Fjords Cruise

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