Consulta: creatorFacets:"Valente,Vera L.S."
Registros recuperados: 8
Data/hora: 06/06/2024 02:42:16

Chromosomal inversion polymorphism in Drosophila mediopunctata: seasonal, altitudinal, and latitudinal variation
Provedor de dados: 74
Autores: Ananina,Galina; Peixoto,Alexandre A.; Bitner-Mathé,Blanche C.; Souza,Wilma N.; Silva,Luciano Basso da; Valente,Vera L.S.; Klaczko,Louis B.
The most polymorphic chromosome for inversions in Drosophila mediopunctata is the chromosome II, where 17 inversions have been found, eight of which occurring in the distal region and nine in the proximal region. We present an analysis of the chromosome II inversion polymorphism with respect to seasonal, altitudinal and latitudinal variation. In D. mediopunctata from the Parque Nacional do Itatiaia (southeastern Brazil), the frequencies of three of the distal inversions (namely DA, DS, and DP) vary seasonally. These inversions also show altitudinal clines in their frequencies. This microgeographic pattern was not observed on a macrogeographic scale. D. mediopunctata from Porto Alegre are less polymorphic for inversions than other populations, the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cline; Microgeographic variation; Temperature; Tripunctata group; Brazil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000100011

Population dynamics of the invasive species Zaprionus indianus (Gupta) (Diptera: Drosophilidae) in communities of drosophilids of Porto Alegre City, Southern of Brazil
Provedor de dados: 82
Autores: Silva,Norma M. da; Fantinel,Carina da C.; Valente,Vera L.S.; Valiati,Victor H.
Population studies of invasive species allow us to understand how invaders react to new biotic and abiotic conditions, and how native species react to invasion. We evaluated the colonisation efficiency of the invader Zaprionus indianus (Gupta), in the urban area of Porto Alegre city, southern of Brazil. Samples of flies were taken from three urban parks, and ecological indexes were used based on the frequency of the sampled species. The indexes were calculated for breeding and feeding sites separately. The highest frequencies of Z. indianus compared to the other drosophilids were registered during seasons of highest mean temperatures, both for the feeding and the breeding sites. The highest values for the dominance index (D) and the lowest values for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological invasion; Ecological index; Urban park.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000300002

Study of the Drosophilidae (Diptera) communities on Atlantic Forest islands of Santa Catarina State, Brazil
Provedor de dados: 82
Autores: Toni,Daniela C. de; Gottschalk,Marco S.; Cordeiro,Juliana; Hofmann,Paulo P.R.; Valente,Vera L.S.
A study of the community dynamics of Drosophilidae was carried out in six insular communities and two others on the mainland. Seasonal collections were carried out throughout two years in Santa Catarina State, southern of Brazil. The diversity index calculations show high values when compared with temperate climate communities. The sites on the mainland (Serra do Tabuleiro) presented the highest diversity, which was measured by the Diversity Index (H'). These sites are covered by primary Atlantic Forest and theoretically should have a higher variation of ecological niches. A dendogram showing the similarity between the communities, calculated by Morisita Index, points to a level of similarity equal to 60% for all communities. In this diagram, we can see...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; Biodiversity; Ecology.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2007000300004

Taxonomic survey of Drosophilidae (Diptera) from mangrove forests of Santa Catarina Island, Southern Brazil
Provedor de dados: 82
Autores: Schmitz,Hermes J.; Valente,Vera L.S.; Hofmann,Paulo R.P.
Assemblages of drosophilids have been characterised in several environments of the Brazilian territory, like the Atlantic Rain Forest, urban areas, cerrados, the Amazon Forest, and others. The present survey is the first attempt to characterise the fauna of Drosophilidae in mangrove forests, an environment typical of tropical coasts worldwide. Twenty-eight samples were collected from the three main mangrove forests of Santa Catarina Island, southern Brazil, using banana-baited traps hung in trees. Samples were taken in January (summer), April (autumn), July (winter) and October (spring) between July 2002 and July 2005. In total, 82,942 specimens of drosophilids were caught, belonging to 69 species of six genera - Amiota Loew, Drosophila Fallén, Leucophenga...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; Biodiversity; Fauna of mangroves; Insect assemblage; Zaprionus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2007000100007

Changes in Brazilian Drosophilidae (Diptera) assemblages across an urbanisation gradient
Provedor de dados: 82
Autores: Gottschalk,Marco S.; De Toni,Daniela C.; Valente,Vera L.S.; Hofmann,Paulo R.P.
The present study aims to characterise the assemblages of Drosophilidae sampled from four sites subject to different levels of urbanisation, in the city of Florianópolis, South Brazil. Five samples were collected between August 2000 and August 2001 and five between August 2002 and August 2003 in each site. A gradual change in the dominant species was observed in the urbanisation gradient, with an increase in relative abundance of exotic species in urban areas. Among the native species, the relative abundance of Drosophila capricorni Dobzhansky &amp;amp; Pavan had an expressive decrease. In the other hand the richness in the low urbanisation site increased, probably due to the presence of urban gardens. The diversity index did not vary significantly among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; Zaprionus; Ecology; Diversity; Richness.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2007000600005

The drosophilid fauna (Diptera, Drosophilidae) of the transition between the Pampa and Atlantic Forest Biomes in the state of Rio Grande do Sul, southern Brazil: first records
Provedor de dados: 84
Autores: Hochmüller,Cleverton J.C.; Lopes-da-Silva,Marcelo; Valente,Vera L.S.; Schmitz,Hermes J.
Although studies on drosophilid (Diptera, Drosophilidae) assemblages have become relatively abundant in the past decades, many environments remain to be searched. The present study investigates the composition, the species abundances and the richness of the drosophilid assemblages in two localities of the municipality of Cruz Alta, northwestern region of the state of Rio Grande do Sul, a point of contact between the biomes Atlantic Forest and Pampa: (i) an urban area (2007), constituted by a domestic orchard with Citrus trees, and (ii) a forested area, in Centro de Educação, Pesquisa e Proteção Ambiental - CEPPA (2008/2009), of Universidade de Cruz Alta, located in a fragment of riparian forest. Collections were conducted using fermented banana-baited...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; Insecta; New records; Neotropical region; Species abundances.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492010001900001

Detection of P element transcripts in embryos of Drosophila melanogaster and D. willistoni
Provedor de dados: 42
Autores: Blauth,Monica L.; Bruno,Rafaela V.; Abdelhay,Eliana; Loreto,Elgion L.S.; Valente,Vera L.S.
The P element is one of the most thoroughly studied transposable elements (TE). Its mobilization causes the hybrid dysgenesis that was first described in Drosophila melanogaster. While studies of the P element have mainly been done in D. melanogaster, it is believed that Drosophila willistoni was the original host species of this TE and that P was transposed to the D. melanogaster genome by horizontal transfer. Our study sought to compare the transcriptional behavior of the P element in embryos of D. melanogaster, which is a recent host, with embryos of two strains of D. willistoni, a species that has contained the P element for a longer time. In both species, potential transcripts of transposase, the enzyme responsible for the TE mobilization, were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; D. willistoni hybrid dysgenesis RNAi P element transposable element.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400007

Chromosome studies in southern Brazilian wheat pest aphids Sitobion avenae, Schizaphis graminum, and Methopolophium dirhodum (Homoptera: Aphididae)
Provedor de dados: 54
Autores: Celis,Verónica E. Rubín de; Gassen,Dirceu N.; Santos-Colares,Marisa C.; Oliveira,Alice K.; Valente,Vera L.S.
We examined the chromosome set of the aphid species Sitobion avenae, Schizaphis graminum and Methopolophium dirhodum by means of conventional staining and C, NOR, AluI and HaeIII banding methods. These species are considered important pests to several plants of economic interest in Brazil. No variation was observed in the number of chromosomes of S. avenae, whereas there was intraspecific variation in the other two species. Interspecific differences in the response to the banding treatments were observed. Whereas these techniques allowed the identification of several S. graminum chromosome pairs, only the AluI treatment was capable of inducing differential staining in the M. dirhodum chromosomes and no clear patterns emerged when the S. avenae preparations...
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551997000300010