Consulta: creatorFacets:"Valiati,Victor Hugo"
Registros recuperados: 3
Data/hora: 05/06/2024 02:38:18

Chromosomal polymorphism in Drosophila willistoni populations from Uruguay
Provedor de dados: 74
Autores: Valente,Vera Lúcia da Silva; Goñi,Beatriz; Valiati,Victor Hugo; Rohde,Cláudia; Morales,Nena Basílio.
Chromosomal polymorphism in natural populations of Drosophila willistoni from Uruguay and southern Brazil was investigated in order to understand the genetic characteristics and evolutionary potential of these almost geographically marginal populations. The level of chromosomal polymorphism in samples from Uruguay was higher than in those from the southernmost Brazilian state of Rio Grande do Sul. The increase in the polymorphism of these populations, in which the species almost reaches its southern limit, contradicts the low level of paracentric inversion polymorphism expected under the central-marginal chromosomal polymorphism cline previously reported. The high frequency of some inversions and the presence of unique inversions in samples from Uruguay...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila willistoni; Chromosome inversion polymorphism; Uruguayan natural populations.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000200009

Two decades of colonization of the urban environment of Porto Alegre, southern Brazil, by Drosophila paulistorum (Diptera, Drosophilidae)
Provedor de dados: 76
Autores: Garcia,Ana Cristina L.; Valiati,Victor Hugo; Gottschalk,Marco S.; Rohde,Cláudia; Valente,Vera Lúcia da S.
Drosophila paulistorum Dobzhansky &amp;amp; Pavan, 1949 had initially been considered absent in anthropogenically disturbed environments, but in 1985 the detection of the species in Porto Alegre city, southern Brazil, suggested its potential to colonize new habitats and laid the foundations for ecologic studies on this species' populations. This study followed the variations in D. paulistorum populations in this town almost 20 years after its first local record. Drosophilid specimens were collected in sites with different urbanization grades and the results point to the expressive decline in D. paulistorum populations in Porto Alegre. This decline may be linked to urban growth and to naturally driven population decline, as imputed to climatic changes like...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological invasion; Colonization; Drosophila paulistorum; Urban ecology; Zaprionus indianus.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000300007

Chromosomal polymorphism in urban populations of Drosophila paulistorum
Provedor de dados: 54
Autores: Valiati,Victor Hugo; Valente,Vera Lucia S.
Drosophila paulistorum populations colonizing the urban area of Porto Alegre, southern Brazil, were studied with the objective of characterizing their chromosomal polymorphism in this new environment. Despite being geographically and ecologically marginal and the fact that the colonization of the urban area seems to be a recent event, the populations showed a large number of inversions on all chromosome arms. Differences regarding inversion frequencies and percentage of heterozygosis were found when we compared the samples with respect to geographical, microenvironmental and temporal aspects. Such differences, however, could be attributed to both selective and stochastic factors
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551997000400004