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

Imaging proto-oceanic crust off the Brazilian Continental Margin

Michelet, Claire; Zeppilli, Daniela; Hubas, Cédric; Baldrighi, Elisa; Cuny, Philippe; Dirberg, Guillaume; Militon, Cécile; Walcker, Romain; Lamy, Dominique; Jézéquel, Ronan; Receveur, Justine; Gilbert, Franck; Houssainy, Amonda El; Dufour, Aurélie; Heimbürger-boavida, Lars-eric; Bihannic, Isabelle; Sylvi, Léa; Vivier, Baptiste; Michaud, Emma.

Bioindicators assess the mangroves ecological state according to the types of pressures but they differ with the ecosystem’s specificities. We investigated benthic meiofauna diversity and structure within the low human-impacted mangroves in French Guiana (South America) in response to sediment variables with various distances to the main city. Contaminant’s concentrations differed among the stations, but they remained below toxicity guidelines. Meiofauna structure (Foraminifera, Kinorhyncha, Nematoda) however varied accordingly. Nematode’s identification brought details on the sediment’s quality. The opportunistic genus Paraethmolaimus (Jensen, 1994) strongly correlated to the higher concentrations of Hg, Pb. Anoxic sediments were marked by organic...

Tipo: Text

Palavras-chave: Mangroves; Biodiversity; Meiofauna; Nematode; Anthropogenic pressures; Natural contamination; South America.

Ano: 2021

URL: https://archimer.ifremer.fr/doc/00684/79587/82274.pdf

Comment on 'A new scheme for the opening of the South Atlantic Ocean and the dissection of an Aptian salt basin' by Trond H. Torsvik, Sonia Rousse, Cinthia Labails and Mark A. Smethurst

Klingelhoefer, Frauke; Evain, Mikael; Afilhado, A.; Rigoti, Caesar; Loureiro, Afonso; Alves, D.; Lepretre, Angelique; Moulin, Maryline; Schnurle, Philippe; Benabdellouahed, Massinissa; Baltzer, Agnes; Rabineau, Marina; Feld, Aurelie; Viana, A.; Aslanian, Daniel.

During the Sanba (Santos basin seismic transect) experiment in 2010–2011, a 380-km-long combined wide-angle and reflection seismic profile has been acquired using 30 ocean-bottom seismometers, a 4.5 km seismic streamer and a 8900 in.3 airgun array. The Sanba 3 profile crosses the southern flank of the Sao Paulo Plateau, the Sao Paulo Ridge and the easternmost Santos Basin in an east–west direction. Its eastern end is located on undisturbed oceanic crust. Tomographic and forward modelling of the wide-angle seismic data reveals that the sedimentary thickness is variable with only 1–2 km on top of the ridge and thickening to 4–5 km in the basin. Crustal thickness at the ridge is about 18 km and the relative layer thickness and velocity gradients indicate a...

Tipo: Text

Palavras-chave: Controlled source seismology; Seismic tomography; Mid-ocean ridge processes; Continental margins: divergent; Continental tectonics: extensional; Crustal structure; South America.

Ano: 2015

URL: http://archimer.ifremer.fr/doc/00242/35296/33826.pdf

Aslanian, Daniel; Moulin, Maryline.

P>Torsvik et al. recently presented a revised model for the opening of the South Atlantic Ocean. According to these authors, this new plate tectonic model is internally consistent and consistent with globally balanced plate motion solutions and takes into account realistic intraplate deformation. However, this model shows a number of kinematic and geological problems that we underline here, together with some comparisons with the new kinematic model recently proposed by Moulin et al.

Tipo: Text

Palavras-chave: Plate motions; Continental margins: divergent; Africa; Atlantic Ocean; South America.

Ano: 2010

URL: http://archimer.ifremer.fr/doc/00014/12504/9878.pdf

Ocean circulation and climate variability in the western South Atlantic and eastern South America during the last deglaciation

Chiessi, Cristiano Mazur.

The growing impact of human activities on the climate system adds a new dimension of complexity and urgency to climate change research. Human activities may have the potential to push key components of the climate system past critical states into qualitatively different modes of operation, i.e. to exceed a tipping point. This possibility requires additional efforts from the many branches of climate change research in order to improve the accuracy of climate change projections. The examination of past climate records has proven to be a very useful area of climate change research. This thesis tackles two elements of the climate system whose tipping points are currently considered very critical: the Atlantic meridional overturning circulation and South...

Tipo: Text

Palavras-chave: South Atlantic; South America; Last deglaciation; Stable isotopes; Trace elements; Atlantic meridional overturning circulation; South American summer monsoon.

Ano: 2008

URL: https://archimer.ifremer.fr/doc/00495/60660/64157.pdf

First record of Ptychoglossus brevifrontalis Boulenger, 1912 (Squamata, Alopoglossidae) in French Guiana

Dewynter, Maël; Godé, Laurent; Girardot, Thierry; Courtois, Elodie Alice.

One specimen of Ptychoglossus brevifrontalis Boulenger, 1912 was found during a field survey in the core area of the Amazonian National Park of French Guiana in the southern part of the country. Despite intensive herpetological surveys in French Guiana during the last three decades, this is the first record of the species for this country. This new locality extends the distribution of the species and draws attention to the need for more study of litter-dwelling lizards in French Guiana.

Tipo: Text

Palavras-chave: Guiana Shield; Herpetofauna; Lizards; Neotropical region; Parc Amazonien de Guyane; South America.

Ano: 2020

URL: https://archimer.ifremer.fr/doc/00607/71942/70640.pdf

New records of Monodelphis kunsi (Didelphimorphia, Didelphidae) from Brazil

Mastozool. neotrop.

Hannibal,Wellington; Figueiredo,Valquiria V; Filho,Paulo Landgref; Godoi,Maurício N.

We review the known distribution of Monodelphis kunsi from South America and reported nine new localities of occurrence in Mato Grosso do Sul state, southwestern Brazil. These new records fill the gap on geographic distribution of M. kunsi in southwestern Brazil. The species presents wide geographic range including distinct habitats. The lack of studies in southwestern Brazil and the non-utilization of pitfall traps can be the main factors responsible for the lack of knowledge on distribution of small mammal species to this region.

Tipo: Info:eu-repo/semantics/report

Palavras-chave: Biogeography; Ecoregions; Pitfall traps; Pygmy short-tailed opossum; South America.

Ano: 2012

URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832012000200012

The extinction of some south american camelids: the case of Lama (Vicugna) Gracilis

Mastozool. neotrop.

Cajal,Jorge; Tonni,Eduardo P.; Tartarini,Viviana.

Lama (Vicugna) gracilis (Gervais and Ameghino, 1881) is a Camelidae that inhabited the low plains of Argentina and Uruguay during the Pleistocene and early Holocene. Considering that Lama gracilis was a vicariant of L. vicugna in the low plains, sympatry cases between Lama guanicoe and Lama vicugna are analyzed to test the hypothesis that considers the competence for the same resource as the cause of extinction of Lama gracilis. It is concluded that the reduced populations of L. gracilis were forced to extinction especially by hunting pressure of paleoindian groups.

Tipo: Info:eu-repo/semantics/article

Palavras-chave: Camelidae; Extinction; Pleistocene; South America.

Ano: 2010

URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832010000100014

Three new species of the genus Adelophryne (Amphibia: Anura: Leptodactylidae) from northeastern Brazil, with remarks on the other species of the genus

Hoogmoed, M.S.; Borges, D.M.; Cascon, P..

In the present paper three new species of the genus Adelophryne from the coastal Atlantic forest in Brazil are described. The species are separated from the two species formerly known from the Amazon forest by caatinga vegetation and a distance of at least 1600 km. A. pachydactylus from Bahia has a reduced number of phalanges in the fourth finger, and large subdigital pads under fingers and toes. A. baturitensis has distinct subarticular tubercles under the toes and a relatively large size. A. maranguapensis has large discs on fingers and toes and is boldly patterned. During fieldwork in Amapá two specimens of A. gutturosa were collected and based on them additional data are provided and some concepts from the original description are revised. Literature...

Sphaeromatidae (Crustacea, Isopoda) of the Beagle Channel and description of Cymodopsis beageli n. sp

Palavras-chave: Adelophryne; South America; Brazil; Atlantic forest; New species; 42.82.

Ano: 1994

URL: http://www.repository.naturalis.nl/record/319391

Brandt, Angelina.

During an expedition with RV Victor Hensen (1994) and the RV Polarstern (1996) Isopoda Sphaeromatidae were collected in and off the eastern entrance of the Beagle Channel. The species found, Caecocassidias patagonica Kussakin, 1967, Cassidinopsis emarginata (Guérin-Méneville, 1843) and Moruloidea darwinii (Cunningham, 1871), were previously all poorly or insufficiently described; therefore a redescription is presented herein. Exosphaeroma gigas (Leach, 1818) was also collected frequently, but it was already redescribed earlier and thus only the localities are presented. Moreover, a new species, Cymodopsis beageli, n.sp., which is most closely allied to Cymodopsis sphyracephalata Hurley & Janssen, 1977, is described from the Beagle Channel.

Four new combinations in Chomelia and Stenostomum (Rubiaceae, Guettardeae) from Central America, the Guianas and the Amazon Basin

Palavras-chave: Crustacea; Isopoda; Taxonomy; Beagle Channel; South America; Southern Ocean; Subantarctic.

Ano: 1998

URL: http://www.repository.naturalis.nl/record/504937

Delprete, P.G.; Achille, F.; Mouly, A..

According to current generic delimitations, supported by wood anatomy, palynology, and recent molecular phylogenies, Antirhea, traditionally treated as a Pantropical genus, is instead restricted to the Paleotropics. At the same time, the Neotropical species traditionally positioned in Antirhea should be positioned in Stenostomum. Following these definitions, Stenostomum is a genus with most of the species present in the Caribbean Region, and two species present in the Guianas, namely S. acreanum and S. guianensis, distributed throughout the Amazon Basin. In addition, according to these new generic delimitations, two species previously positioned in Guettarda and Antirhea need to be transferred to Chomelia, as C. triflora and C. ulei.

On the female sex of some elusive South-American Gomphidae with the descriptions of three new genera and four new species (Odonata)

Palavras-chave: Amazon Basin; Chomelia; Floristics; French Guiana; Guettarda; Guettardeae; Guyana; Rubiaceae; South America; Stenostomum; Taxonomy.

Ano: 2010

URL: http://www.repository.naturalis.nl/record/525264

Belle, J..

Females of some South-American Gomphidae are recorded. Anomalophlebia nitida gen. nov. et spec. nov. ( ♀ holotype: Venezuela, State of Bolivar, Los Pijiguasos), Praeviogomphus proprius gen. nov. et spec. nov. ( ♀ holotype: Brazil, State of Rio de Janeiro, Itatiaya), Brasiliogomphus uniseries gen. nov. et spec. nov. ( ♀ holotype: Brazil, State of São Paulo, Lins) and Idiogomphoides emmeli spec. nov. ( ♀ holotype: Brazil, State of Rondônia, Rio Pardo) are described and illustrated. A syntype female of Agriogomphus sylvicola Selys is designated as lectotype. The female of Diaphlebia nexans Calvert and Gomphoides perdita (Förster) are described for the first time while two females pertaining to unknown species of Progomphus and Aphylla are described under...

Taxonomic position and identity of Stenocephalum monticola (Vernonieae, Asteraceae)

Palavras-chave: Gomphidae; New taxa; South America; 42.75.

Ano: 1995

URL: http://www.repository.naturalis.nl/record/319073

Dematteis, M.; Angulo, M.B..

The genus Stenocephalum (Vernonieae, Asteraceae) includes six South American species that have cylindrical heads, 4–11 florets by capitula, cymose inflorescences and type ‘C’ pollen. Until now, Stenocephalum monticola has been considered as a synonym of S. apiculatum. However, the analysis of the type material and additional specimens indicate that it is a quite different species, which differs in leaf size, pubescence and capitula arrangement. Stenocephalum monticola has leaves of 9–20 mm long, leaf blades villous at the base and capitula agglomerate at the stems tips, while S. apiculatum presents leaves of 30–60 mm long, leaf blades basally glabrous and heads mostly solitary, arranged in a pseudo-spiciform inflorescence. Consequently, in this paper S....

New species of Lessingianthus (Asteraceae, Vernonieae) from Brazil and Paraguay

Palavras-chave: Vernonia; Compositae; South America; Brazil; Taxonomy.

Ano: 2008

URL: http://www.repository.naturalis.nl/record/524666

Dematteis, M.; Angulo, M.B..

Two new species of the genus Lessingianthus (Vernonieae, Asteraceae) from Brazil and Paraguay are described and illustrated. Lessingianthus cipoensis is characterized by the presence of solitary heads disposed in short branches and ovate to elliptical leaves. It has a certain resemblance to L. vestitus, which has more branched inflorescences, with long branches, and lanceolate to obovate-lanceolate leaves. Lessingianthus paraguariensis is closely related to L. asteriflorus and L. mollissimus, but it can be distinguished by the broadly elliptical leaves and the large size of the outer phyllaries.

Morphological comparison of Mesocyclops araucanus Campos et al., 1974, and M. longisetus Thiébaud, 1912, and first description of their males

Palavras-chave: Compositae; New species; South America; Taxonomy; Vernonia.

Ano: 2012

URL: http://www.repository.naturalis.nl/record/525043

Pilati, Alberto; Menu-Marque, Silvina.

Originally described by Löffler in 1962 as a variety of Mesocyclops longisetus, M. araucanus was found to have autapomorphies of its own to deserve specific rank. For a long time the identification of these two species were mixed up. Here, M. araucanus female is redescribed and the male described for the first time. A comparison is made with M. longisetus, whose male is also described for the first time. Detailed comparison between these two species shows that the following traits on specimens of both sexes can be used to separate the species: length/width ratio of caudal rami, ratio of terminal caudal setae, and length/width ratio of last segment of endopod of leg 4. Additional diagnostic characters for each sex are given. The geographic distributions of...

The fry patterns in the South-American catfish genus Corydoras (Pisces, Siluriformes, Callichthyidae)

Palavras-chave: Copepoda; Cyclopoida; Mesocyclops; South America; Morphology.

Ano: 2002

URL: http://www.repository.naturalis.nl/record/505083

Fuller, Ian.

The fry pattern of aquarium-bred species of the South-American catfish genus Corydoras, contribute to discriminate between species of the so-called ‘acutus’-group, showing a greyish adult colour pattern.

On relict hydrobiid species in Brazilian Amazonia (Gastropoda, Prosobranchia, Hydrobiidae)

Palavras-chave: Callichthyidae; Corydoras; Development; Colour pattern; South America.

Ano: 1999

URL: http://www.repository.naturalis.nl/record/505319

Wesselingh, F.P..

Two extant hydrobiid species from the lower Tapajos river of Brazil are redescribed. Potamopyrgus amazonicus Haas, 1949, is assigned to the genus Dyris Conrad, 1871. At least eleven species from Miocene deposits of Western Amazonia are assigned to Dyris, a genus that was previously assumed to be extinct. The apertural features of Sioliella effusa Haas, 1949, are considered indicative of a close relationship to Miocene Amazonian taxa formaly assigned to Eubora Kadolsky, 1980. Sioliella ovata spec. nov., a Miocene species resembling S. effusa is described. The two Tapajos species can be regarded as relicts of a speciose, endemic, Miocene Western Amazonian molluscan fauna.

A new species of the genus Homolobus Foerster from Ecuador (Hymenoptera: Braconidae: Homolobinae)

Palavras-chave: South America; Amazonia; Miocene; Recent; Hydrobiidae; Dyris; Sioliella; New species; 42.73; 38.22.

Ano: 2000

URL: http://www.repository.naturalis.nl/record/235203

Achterberg, C. van; Shaw, S.R..

A new high elevation altitude species of the genus Homolobus Foerster (Hymenoptera: Braconidae: Homolobinae), H. fuscinervis spec. nov. from Ecuador (Napo province, 2163 m elevation) is described and illustrated.

Studies on the species of the South American lizard genus Arthrosaura Boulenger (Reptilia: Sauria: Teiidae), with the resurrection of two species

Palavras-chave: Hymenoptera; Braconidae; Homolobinae; Homolobus; Oulophus; Neotropical; South America; Ecuador; 42.75.

Ano: 2009

URL: http://www.repository.naturalis.nl/record/315877

Hoogmoed, M.S.; Avila-Pires, T.C.S..

Arthrosaura versteegii and Pantodactylus tyleri are resurrected from the synonymy of A. reticulata. Detailed descriptions of the three species are provided, a key to the species of the genus is presented, differences are pointed out and synonymy and distribution of the known species are given. Two of the species occur sympatrically in several areas, whereas in one area three species are sympatric. The distribution of A. kockii mainly is limited to the eastern part of the Guianas, but also encompasses eastern Pará; that of A. reticulata extends from the Amazonian lowlands of Ecuador to the mouth of the Amazon and also includes the Guianas, that of A. versteegii seems to be restricted to the Guianas, whereas A. tyleri is only known from a high altitude on...

Two new species of Coussarea and a new combination in Faramea (Rubiaceae, Coussareeae) from the Guianas

Palavras-chave: Arthrosaura kockii; Arthrosaura reticulata; Arthrosaura tyleri; Arthrosaura versteegii; South America; Cis-Andean; Brazil; Guianas; Venezuela; Ecuador; Amazon basin; Distribution; Morphology; 42.82.

Ano: 1992

URL: http://www.repository.naturalis.nl/record/318225

Delprete, P.G..

During the preparation of the treatment of the family Rubiaceae for the Flora of the Guianas, two new species of Coussarea were discovered. One species, Coussarea longilaciniata, was collected in Guyana and is characterized by its long-lanceolate calyx lobes; the other, C. spicata, is from French Guiana and is unique in the genus by its spicate inflorescences. In addition, Faramea sessiliflora var. pedunculata is here elevated to the species level, and a new description of F. sessiliflora is also provided in view of the re-delimitation of this species.

Three new species of South American Moraceae

Palavras-chave: Rubiaceae; Coussareeae; Coussarea; Faramea; Guianas; South America; Floristics; Taxonomy.

Ano: 2006

URL: http://www.repository.naturalis.nl/record/525621

Berg, C.C.; Homeier, J..

New South American species are described, one in each of the following genera: Ficus, Helicostylis and Naucleopsis.