Consulta: creatorFacets:"Vallinoto,Marcelo"
Registros recuperados: 10
Data/hora: 16/06/2024 19:41:35

Molecular phylogeny of the genus Saguinus (Platyrrhini, Primates) based on the ND1 mitochondrial gene and implications for conservation
Provedor de dados: 74
Autores: Tagliaro,Claudia Helena; Schneider,Horacio; Sampaio,Iracilda; Schneider,Maria Paula Cruz; Vallinoto,Marcelo; Stanhope,Michael.
The systematics of the subfamily Callitrichinae (Platyrrhini, Primates), a group of small monkeys from South America and Panama, remains an area of considerable discussion despite many investigations, there being continuing controversy over subgeneric taxonomic classifications based on morphological characters. The purpose of our research was to help elucidate the phylogenetic relationships within the monkey genus Saguinus (Callitrichinae) using a molecular approach to discover whether or not the two different sections containing hairy-faced and bare-faced species are monophyletic, whether Saguinus midas midas and Saguinus bicolor are more closely related than are S. midas midas and Saguinus midas niger, and if Saguinus fuscicollis melanoleucus and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saguinus; Callitrichinae; ND1; Phylogeny; MtDNA; Conservation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100009

Low levels of genetic diversity depicted from mitochondrial DNA sequences in a heavily exploited marine fish (Cynoscion acoupa, Sciaenidae) from the Northern coast of Brazil
Provedor de dados: 74
Autores: Rodrigues,Rosa; Schneider,Horacio; Santos,Simôni; Vallinoto,Marcelo; Sain-Paul,Ulrich; Sampaio,Iracilda.
The acoupa weakfish (Cynoscion acoupa - Sciaenidae) is a marine species of croaker with estuarine-dependent behavior, found in the western Atlantic from Panama to Argentina. It is one of the most exploited food fish on the northern coast of Brazil. In this study, DNA sequences were determined from the entire control region (D-loop) of the mitochondrial genome of 297 individuals collected during seven different months between December 2003 and August 2005 on the northern coast of Brazil (Amapá and Pará). Genetic variability expressed by haplotype (h = 0,892) and nucleotide (pi = 0,003) diversities were low compared to other heavily exploited marine fish species from the western Atlantic and eastern Asia. AMOVA depicted a lack of genetic structuring among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynoscion acoupa; Acoupa weakfish; Sciaenidae; Low genetic diversity; Mitochondrial DNA; D-loop.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000300015

Mitochondrial DNA-like sequence in the nuclear genome of Saguinus (Callitrichinae, Primates): transfer estimation
Provedor de dados: 74
Autores: Vallinoto,Marcelo; Sena,Leonardo; Sampaio,Iracilda; Schneider,Horacio; Schneider,Maria Paula.
Mitochondrial DNA-like sequences have been found in the nuclei of a variety of organisms. These nuclear pseudogenes can be used to estimate relative evolutionary rates of mitochondrial genes, and can be used as outgroups in phylogenetic analyses. In this study, mitochondrial sequences with pseudogene-like characteristics, including deletions and/or insertions and stop codons, were found in tamarins (Saguinus spp., Callitrichinae, Primates). Phylogenetic analysis allowed estimation of the timing of the migration of these sequences to the nuclear genome, and also permitted inferences on the phylogeny of the genus. The choice of an inadequate outgroup (Aotus infulatus) prevented a good phylogenetic resolution of the subfamily Callitrichinae. The relatively...
Tipo: Info:eu-repo/semantics/article
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000100006

New molecular evidence supports the species status of Kaempfer's Woodpecker (Aves, Picidae)
Provedor de dados: 74
Autores: Azevedo,Lorena de Sousa; Aleixo,Alexandre; Santos,Marcos Pérsio Dantas; Sampaio,Iracilda; Schneider,Horacio; Vallinoto,Marcelo; Rêgo,Péricles Sena do.
Kaempfer's Woodpecker (Celeus obrieni) is the only species of the genus Celeus endemic to Brazil. The description of this taxon as a subspecies of the Rufous-headed Woodpecker (Celeus spectabilis) was based on a single specimen. While C. obrieni and C. spectabilis are now considered separate species based on morphological and limited molecular evidence, no study has critically tested the reciprocal monophyly and degree of evolutionary independence between these taxa with several specimens. Herein, fragments of the mitochondrial and nuclear DNA of three recently-collected specimens of C. obrieni were analyzed to evaluate the degree of evolutionary differentiation of this taxon with respect to C. spectabilis. The results confirm the reciprocal monophyly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bamboo; Biogeography; Celeus obrieni; Celeus spectabilis; Taxonomy.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000200009

Tocantins river as an effective barrier to gene flow in Saguinus niger populations
Provedor de dados: 74
Autores: Vallinoto,Marcelo; Araripe,Juliana; Rego,Péricles S. do; Tagliaro,Claudia H.; Sampaio,Iracilda; Schneider,Horacio.
The Saguinus represent the basal genus of the Callitrichinae subfamily. Traditionally this genus is divided into three groups: Hairy, Mottled and Bare-face, however, molecular data failed to validate these groups as monophyletic units, as well as raised some subspecies to the species status. This is the case of the former subspecies Saguinus midas midas and S. midas niger, which are now considered as different species. In the present study, we sequenced a portion of the D-loop mtDNA region in populations from the East bank of the Xingu and from both banks of the Tocantins river, in order to test the effectiveness of large rivers as barriers to the gene flow in Saguinus. According to our results, the populations from the East and West banks of the Tocantins...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Primates; Saguinus niger; D-loop; MtDNA; Tocantins river.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200005

Inclusion of South American samples reveals new population structuring of the blacktip shark (Carcharhinus limbatus) in the western Atlantic
Provedor de dados: 74
Autores: Sodré,Davidson; Rodrigues-Filho,Luis F.S.; Souza,Rosália F.C.; Rêgo,Péricles S.; Schneider,Horacio; Sampaio,Iracilda; Vallinoto,Marcelo.
Carcharhinus limbatus has a cosmopolitan distribution and marked genetic structuring, mainly because of its philopatric behavior. However, analysis of this structuring has not previously included South American populations. In the present study, we analyzed a sample of adult individuals collected on the northern coast of Brazil and compared the sequences of the mitochondrial control region with those of populations already genotyped. Relatively high haplotype diversity (12 haplotypes, genetic diversity of 0.796) was observed, similar to that in other populations but with a much larger number of private alleles. In contrast to populations studied previously, which were represented by neonates, the pronounced allelic variability found in the South American...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcharhinus limbatus; Control region; Fishery stocks; Mitochondrial DNA; Population genetics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000500008

Significant genetic differentiation among populations of Anomalocardia brasiliana (Gmelin, 1791): a bivalve with planktonic larval dispersion
Provedor de dados: 74
Autores: Arruda,Cinthya Cristina Bulhões; Beasley,Colin Robert; Vallinoto,Marcelo; Marques-Silva,Nelane do Socorro; Tagliaro,Claudia Helena.
Four Brazilian populations of Anomalocardia brasiliana were tested for mutual genetic homogeneity, using data from 123 sequences of the mtDNA cytochrome oxidase c subunit I gene. A total of 36 haplotypes were identified, those shared being H3 (Canela Island, Prainha and Acupe) and both H5 and H9 (Prainha and Acupe). Haplotype diversity values were high, except for the Camurupim population, whereas nucleotide values were low in all the populations, except for that of Acupe. Only the Prainha population showed a deviation from neutrality and the SSD test did not reject the demographic expansion hypothesis. Fst values showed that the Prainha and Acupe populations represent a single stock, whereas in both the Canela Island and Camurupim stocks, population...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MtDNA; COI; Population; Anomalocardia brasiliana; Conservation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200033

Can Lutjanus purpureus (South red snapper) be "legally" considered a red snapper (Lutjanus campechanus)?
Provedor de dados: 74
Autores: Gomes,Grazielle; Schneider,Horacio; Vallinoto,Marcelo; Santos,Simoni; Orti,Guillermo; Sampaio,Iracilda.
Red snappers (Lutjanus purpureus in Brazil and Lutjanus campechanus in USA and Gulf of Mexico) are both under clear effect of overfishing. Because of their high morphological similarity it has already been suggested that they could possibly be considered as a single species. To investigate the degree of similarity and the genetic structure of red snapper populations we constructed a common dataset of partial D-loop mtDNA sequences of L. purpureus from Brazil (Amapá, Pará and Maranhão) and L. campechanus from the Atlantic coast of the USA (Florida, Louisiana and Mississippi). Phylogenetic and population genetic analyses surprisingly depicted high similarity between L. campechanus and L. purpureus, compatible with the hypothesis of a single species of red...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Red snapper; Lutjanus purpureus; Lutjanus campechanus; Population genetic structure; Mitochondrial D-loop.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200035

Identification and phylogenetic inferences on stocks of sharks affected by the fishing industry off the Northern coast of Brazil
Provedor de dados: 74
Autores: Rodrigues-Filho,Luis Fernando da Silva; Rocha,Tainá Carreira da; Rêgo,Péricles Sena do; Schneider,Horacio; Sampaio,Iracilda; Vallinoto,Marcelo.
The ongoing decline in abundance and diversity of shark stocks, primarily due to uncontrolled fishery exploitation, is a worldwide problem. An additional problem for the development of conservation and management programmes is the identification of species diversity within a given area, given the morphological similarities among shark species, and the typical disembarkation of processed carcasses which are almost impossible to differentiate. The main aim of the present study was to identify those shark species being exploited off northern Brazil, by using the 12S-16S molecular marker. For this, DNA sequences were obtained from 122 specimens collected on the docks and the fish market in Bragança, in the Brazilian state of Pará. We identified at least 11...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sharks; Molecular identification; Phylogenetic; MtDNA; Conservation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200031

Genetic characterisation of populations of the critically endangered Goliath grouper ( Epinephelus itajara,  Serranidae) from the Northern Brazilian coast through analyses of mtDNA
Provedor de dados: 74
Autores: Silva-Oliveira,Gláucia C.; Rêgo,Péricles S. do; Schneider,Horacio; Sampaio,Iracilda; Vallinoto,Marcelo.
The Goliath grouper ( Epinephelus itajara ) is one of the most endangered species of fish of the subfamily Epinephelinae. Slow to develop and mature, and dependent on mangrove habitats for breeding, the species also suffers intense harvesting, which has reduced drastically in numbers in many areas. To contribute to the understanding of the characteristics of  E. itajara  populations, we conducted a molecular genetics study of the species, focusing on populations from the Northern Brazilian coast. The mtDNA control region (D-loop) of 116 individuals from five localities (Bragança, Ajuruteua, Parnaíba, Fortaleza and Natal) was analysed, and a sequence of 499 base pairs identified. Analyses of the sequences indicated that genetic variability was generally...
Palavras-chave: Goliath grouper; Epinephelus itajara; Control region; MtDNA; Population genetics.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500029