|
|
|
| Registros recuperados: 259 | |
|
|
| López,Carlos; Steinitz-Kannan,Miriam; Stamou,Georgia; Michaloudi,Evangelia; Papakostas,Spiros; Fontaneto,Diego; Segers,Hendrik. |
| Abstract The presence of the rotifer species Brachionus rotundiformis from the B. plicatilis species complex in Lake Arcturo, a saline lake in the Genovesa Island of the Galápagos Islands, is here reported. This is the first record of the species for the rotifer fauna of Ecuador as well as of the species complex to the Galápagos Islands. This finding is consistent with the idea of high dispersion capacity, and of cosmopolitan distribution of this species complex. Because Genovesa Island is uninhabited, passive transport by wind currents and zoochory by migrant birds seem to emerge as the most plausible factors in this process of colonization. Integrative studies on the morphological variations, genetic, molecular, and ecological aspects are still required... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachionidae; Geographical distribution; Neotropics; Rotifers; South America. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100221 |
| |
|
|
| Nascimento,Francisco Eriberto de Lima; Santos-Silva,Antonio. |
| Abstract Glyptoscapus letiziae, a new species of Hexoplonini Martins, 2006, is described from Brazil (Minas Gerais). Glyptoscapus cicatricosus Aurivillius, 1899 and G. vanettii Martins, 1959 are synonymized with G. pallidulus (White, 1855). A key to species of Glyptoscapus is provided. New state records are presented for Thoracibidion io (Thomson, 1867) (Neoibidionini), Coleoxestia rafaeli Santos-Silva & Wappes, 2017 and C. denticornis (Gahan, 1892) (Cerambycini). The female of C. rafaeli is described for the first time. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Key; Southern Brazil; South America; Taxonomy. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492018000100234 |
| |
|
|
| Rodrigues,Higor D.D.; Moreira,Felipe F.F.. |
| ABSTRACT The broad-shouldered water strider Paravelia cunhai sp. nov. is described and illustrated based on material from the state of Pará, northern Brazil. The new species can be distinguished from all other species in this genus mainly by the dark color of the head and pronotum, absence of pruinosity or silvery pubescence on the anterior lobe of pronotum, maculae pattern on the fore wings, hind femur with row of 22 spines on mesal margin, and general shape of the paramere. This new species was collected in a pool inside a cave without incident light, a habitat recorded for the genus only recently, which reinforces the hypothesis that some species of Paravelia have troglophilic habits. In addition, a photograph of the dorsal habitus and notes concerning... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gerromorpha; South America; Veliinae; Broad-shouldered water striders. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492016001700183 |
| |
|
| |
|
|
| Silva,João Paulo C.B. da; Carvalho,Marcelo R. de. |
| Potamotrygon tatianae sp. nov., is described from Río Madre de Díos, Peru, upper Rio Madeira basin. The new species is distinguished from all congeners by a unique combination of characters, including its dorsal color pattern formed by a relatively slender, highly convoluted, beige to dark brown vermicular pattern, a single row of dorsal tail spines, and a relatively longer tail posterior to caudal stings. Potamotrygon tatianae sp. nov., occurs sympatrically with other species of Potamotrygon (P. falkneri, P. orbignyi and P. motoro). From the similar species P. falkneri, P. tatianae sp. nov., is further distinguished by the absence of circular, reniform, and oval spots, by its proportionally much longer tail, by having dorsal tail spines in one irregular... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Potamotrygon tatianae sp. nov.; Potamotrygon falkneri; Taxonomy; Morphology; Cryptic species; Río Madeira; South America. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011000800001 |
| |
|
| |
|
| |
|
| |
|
|
| Santos-Silva,Antonio; Lingafelter,Steven W.. |
| The characters defining Mecosarthron Buquet, 1840 and Xixuthrus Thomson 1864 are discussed, along with a historical review of the literature that described and classified these taxa. Through morphological examination of these genera and most of the included species, we addressed the systematic placement of Xixuthrus domingoensis Fisher, 1932 that was placed in Mecosarthron by Ivie (1985). We restore its placement in the genus Xixuthrus. The first description of the female of X. domingoensis is provided, along with comparative redescriptions of Mecosarthron gounellei (Lameere, 1903), and M. buphagus Buquet, 1840. We include a key to the species currently in Mecosarthron. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Systematics; Hispaniola; South America; Longhorned beetles; Sexual dimorphism; Morphology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492012002700001 |
| |
|
|
| Silva,Fernanda dos Santos; Cavallari,Daniel Caracanhas; Simone,Luiz Ricardo Lopes de. |
| Abstract New records for Helicina schereri Baker, 1913, are reported. It was a species previously restricted to the states of Ceará, Rio Grande do Norte, Paraíba, Alagoas and Tocantins in Northeastern Brazil, and State of Santa Catarina, much further south. The new occurrences reported herein fill distribution gaps and also significantly expand the range of the species ca. 970 km westwards. The new records are from the following locations: Bahia State (Ituaçu and Itaquara municipalities) in Northeast Brazil; Mato Grosso do Sul State (Bonito Municipality) in the Midwest; and Minas Gerais (Lagoa Santa municipality) in the Southeast. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land snails; Neritimopha; Range expansion; South America. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100203 |
| |
|
|
| Santos-Silva,Antonio; Nascimento,Francisco Eriberto de Lima; Drumont,Alain; Kozlov,Anton Olegovich. |
| ABSTRACT Three new species and one new genus are described: Psyrassa lisitskyi sp. nov., from Peru (Elaphidiini); Ophtalmibidion antonkozlovi sp. nov., from Colombia (Neoibidionini); and Nappella gen. nov., is proposed to N. antonkozlovi sp. nov., from Peru (Calliini). Epectasis mexicana Breuning, 1954 is redescribed, and figured for the first time, and recorded for Colombia. Psyrassa lisitskyi is included in a modified couplet from a previous key. A key to species of Ophtalmibidion and genera of Calliini are provided. Chorenta biramiguelus is recorded for Peru. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Key; Longhorned beetle; South America; Taxonomy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100215 |
| |
|
|
| Zaher,Hussam; Grazziotin,Felipe Gobbi; Cadle,John E.; Murphy,Robert W.; Moura-Leite,Julio Cesar de; Bonatto,Sandro L.. |
| We present a molecular phylogenetic analysis of caenophidian (advanced) snakes using sequences from two mitochondrial genes (12S and 16S rRNA) and one nuclear (c-mos) gene (1681 total base pairs), and with 131 terminal taxa sampled from throughout all major caenophidian lineages but focussing on Neotropical xenodontines. Direct optimization parsimony analysis resulted in a well-resolved phylogenetic tree, which corroborates some clades identified in previous analyses and suggests new hypotheses for the composition and relationships of others. The major salient points of our analysis are: (1) placement of Acrochordus, Xenodermatids, and Pareatids as successive outgroups to all remaining caenophidians (including viperids, elapids, atractaspidids, and all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Serpentes; Colubridae; Caenophidia; Phylogeny; Classification; Systematics; Xenodontinae; Dipsadinae; New genus; Elapoidea; Colubroidea; South America; West Indies. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492009001100001 |
| |
|
| |
|
|
| Carvalho,Marcelo R. de; Ragno,Maíra P.. |
| A new species of the relatively poorly known Neotropical freshwater stingray genus Plesiotrygon Rosa, Castello & Thorson, 1987 is described from the main channel and smaller tributaries (Ríos Itaya and Pachitea) of the upper Amazon basin in Peru. The first specimen to be collected, however, was from much farther east in Rio Solimões in 1996, just down-river from Rio Purus (specimen unavailable for this study). Plesiotrygon nana sp. nov., is a very distinctive and unusually small species of freshwater stingray (Potamotrygonidae), described here mostly from three specimens representing different size classes and stages of sexual maturity. Plesiotrygon nana sp. nov., is distinguished from its only congener, P. iwamae Rosa, Castello & Thorson,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plesiotrygon iwamae; Taxonomy; Morphology; Myliobatiformes; Rio Solimões; Río Ucayali; South America. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011000700001 |
| |
|
| |
|
|
| Pereira,Paulo Roberto Valle da Silva; Navia,Denise; Salvadori,José Roberto; Lau,Douglas. |
| The objective of this work was to evaluate the occurrence of Aceria tosichella Keifer (Prostigmata: Eriophyidae), the wheat curl mite, in Rio Grande do Sul, Brazil. Samples to detect A. tosichella specimens were collected in wheat, corn, oat crops and potential host grasses in 46 localities, in October 2006, August and October 2007. Samples of wheat were also collected in experimental greenhouses at Embrapa Trigo, Passo Fundo, RS, Brazil. A. tosichella specimens were found in wheat samples from Passo Fundo, Palmeira das Missões, São Luís Gonzaga, and Santo Antônio das Missões, RS, Brazil. Symptoms due to A. tosichella infestations were observed only in greenhouse conditions. This is the first report of A. tosichella in Brazil and the second in South America. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eriophyoidea; South America; Acari; Cereal; Quarantine; Virus. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000500015 |
| |
|
|
| Seo, S. Niggol; Mendelsohn, Robert. |
| This paper examines climate change impacts on South American agriculture using a set of Ricardian regressions estimated across different samples of farms in South America. Regressions are run for the whole sample and for subsamples of crop-only, mixed, and livestock-only farms. The results indicate that climate sensitivity varies a great deal across each type of farm. The analysis also reveals that the impacts will vary substantially across South America. The hot and wet Amazon and Equatorial regions are likely to lose the most from warming scenarios whereas the more temperate high elevation and southern regions of South America will likely gain. |
| Tipo: Journal Article |
Palavras-chave: Climate change; Agriculture; South America; Environmental Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/53872 |
| |
|
|
| Jarvis, Lovell S.. |
| Brazil, the worlds largest coffee exporter, encouraged efforts in the 1960s to form the International Coffee Agreement (ICA), which restricted total coffee exports via country export quotas. The quotas led to significant domestic quota rents in producing countries. This paper analyzes the effects of rent seeking in Brazil. The Brazilian Institute of Coffee (IBC), which was responsible for coffee policy, was the focus of rent seeking. The paper models the policy instruments used by the IBC, shows how rent seeking affected policy, industry efficiency and the distribution of rents, explains the causes and effects of IBC reforms in the late 1980s, and draws lessons from the experience. |
| Tipo: Working or Discussion Paper |
Palavras-chave: South America; Brazil; International Coffee Agreement; Rent seeking; Export tax rebates; International Relations/Trade. |
| Ano: 2004 |
URL: http://purl.umn.edu/11952 |
| |
|
| |
|
|
| Wood, Stanley; You, Liangzhi; Zhang, Xiaobo. |
| From a theoretical perspective crop yields should tend to converge over time and space as: growth in yield potential exhibits diminishing returns; an increasing share of farmers shift to using high yielding varieties (HYVs); barriers to the free flow of knowledge and information are removed; and significant investments continue to be made in supporting institutions whose mandates include facilitating and accelerating the cross-border flow of improved agricultural technologies. Using a new, sub-national crop yield database for Latin America and the Caribbean (LAC) we examine whether convergence is indeed occurring, and discover it is not. On the contrary, there is evidence of divergence. We test three hypotheses that might help account for this finding:... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Crop yields; Maize; Rice; Soybeans; Latin America; Caribbean; South America; Crop Production/Industries. |
| Ano: 2004 |
URL: http://purl.umn.edu/60322 |
| |
| Registros recuperados: 259 | |
|
|
|
