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Dive into the research topics where Margaret Maria de Oliveira Corrêa is active.

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Featured researches published by Margaret Maria de Oliveira Corrêa.


Caryologia | 1995

Cytogenetic studies on the Perciformes Orthopristis ruber(Haemulidae) and Scartella cristata (Blenniidae)

Mario Jorge Ignacio Brum; Margaret Maria de Oliveira Corrêa; Carla Carneiro de Oliveira; Pedro M. Galetti

SUMMARYTwo Perciformes species (Orthopristis ruber and Scartella cristata) occurring along the southeastern coast of Brazil (Guanabara Bay, RJ) were analyzed cytogenetically by standard techniques, by silver nitrate staining and by C-banding. The results obtained in the present study confirm the karyotypic stability observed among Perciformes since both species present a diploid complement consisting of 48 chromosomes. The two species presented similar C-banding patterns revealing constitutive heterochromatin blocks in centromeric and telomeric positions in most chromosomes in the complement. S. cristata showed the presence of a NOR pair located subterminally in one of the largest subtelocentric pairs. The results obtained for O. ruber about this feature were not satisfactory.


Zoologia | 2011

A new karyotype of Wiedomys pyrrhorhinus (Rodentia: Sigmodontinae) from Chapada Diamantina, northeastern Brazil

Ana Lazar Gomes E Souza; Margaret Maria de Oliveira Corrêa; Cecilia Teixeira de Aguilar; Leila Maria Pessôa

A new karyotype of Wiedomys pyrrhorhinus (Wied, 1821) is described, including G- and C-banding and Ag-NOR sites from specimens collected in the municipality of Morro do Chapeu, situated in the northern region of the Chapada Diamantina, state of Bahia. Karyological studies of W. pyrrhorhinus have shown a constant diploid number (2n) of 62 with two different numbers of autosomal arms (FNa): 86 and 90, respectively. The new karyotype revealed 2n = 62 and FNa = 104, being the higher autosomal number found so far for this genus. The X chromosome is a large acrocentric and the Y chromosome is a small acrocentric. The analysis of the karyotype morphology suggests that this new karyotype is more closely related to the previous karyotype with 2n = 62 and FNa = 90, described from Caetite, Bahia State. Further studies, comparing different populations of W. pyrrhorhinus, including molecular approaches, may help to better understand the geographical limits of each population and their phylogenetic relationships in the Caatinga biome


Journal of Mammalogy | 2017

Karyotypic and phylogeographic analyses of Cormura brevirostris (Chiroptera, Emballonuridae)

Margaret Maria de Oliveira Corrêa; Daniela Dias; Hugo Mantilla-Meluk; Ana Lazar; Cibele R. Bonvicino

Cormura brevirostris is a rare and poorly known species of emballonurid bat that occurs in Central America and South America across the Amazonian region. Previous work showed that karyotypes of C. brevirostris from Colombia, Suriname, and the Brazilian Amazon presented 2n = 22 and FN = 40, although small differences in chromosome composition have been observed among these karyotypes. Phylogenetic studies using nuclear and mitochondrial markers also showed differences between Central and South American C. brevirostris individuals. We describe the karyotype of an adult male C. brevirostris from the Brazilian Amazon and compare it to other karyotypes reported for this species. We also investigate phylogenetic relationships within this species using 2 mitochondrial and 1 nuclear gene. Morphological characters and measurements of the Brazilian specimen matched those described for C. brevirostris. The karyotype displayed a C-banding pattern similar to those described for C. brevirostris from other localities. Phylogenetic analyses confirmed the monophyly of Cormura, but each marker showed a different relationship. Karyological data showing more than 1 lineage and deep intraspecific mitochondrial lineages suggest that this taxon could be a species complex, requiring additional taxonomic studies to elucidate species limits and phylogenetic relationships within the genus Cormura. Cormura brevirostris é uma espécie rara e pouco conhecida de morcegos embalonurídeos que ocorre na América Central e em toda a região Amazónica da América do Sul. Trabalhos anteriores mostraram que os cariótipos de C. brevirostris da Colômbia, do Suriname e da Amazônia brasileira apresentaram 2n = 22 e FN = 40, embora pequenas diferenças na composição dos cromossomos tenham sido observadas entre esses cariótipos. Estudos filogenéticos utilizando marcadores nucleares e mitocondriais também mostraram diferenças entre os indivíduos de C. brevirostris das Américas Central e do Sul. Descrevemos o cariótipo de um adulto de C. brevirostris da Amazônia brasileira e comparamos com outros cariótipos relatados para essa espécie. Também investigamos as relações filogenéticas dentro desta espécie usando 2 genes mitocondriais e 1 nuclear. Medidas e caracteres morfológicos do espécime brasileiro coincidiram com as descritas para C. brevirostris. O cariótipo mostrou um padrão de bandas-C semelhante àqueles descritos para C. brevirostris de outras localidades. As análises filogenéticas confirmaram a monofilia de Cormura, mas cada marcador mostrou um relacionamento diferente. Os dados cariológicos que mostram mais de 1 linhagem e linhagens mitocondriais de profunda divergência intraspecífica sugerem que este táxon pode ser um complexo de espécies, necessitando de estudos taxonômicos adicionais para elucidar os limites das espécies e as relações filogenéticas dentro do gênero Cormura.


Chromosome science | 1998

Chromosome associations by centromeric heterochromatin in marine fishes

Cecilia Teixeira de Aguilar; Margaret Maria de Oliveira Corrêa; Pedro Manoel Galetti


Cytologia | 1997

Chromosomal Diversity in Scorpaenidae (Teleostei, Scorpaeniformes): Cytogenetic Studies in Scorpaena brasiliensis and Scorpaena isthmensis from the Coast of Rio de Janeiro, Brazil

Margaret Maria de Oliveira Corrêa; Pedro Manoel Galetti Junior


Mastozoología neotropical | 2013

CHROMOSOMAL DIFFERENTIATION IN Kerodon rupestris (RODENTIA: CAVIIDAE) FROM THE BRAZILIAN SEMI-ARID REGION

Gisele Lessa; Margaret Maria de Oliveira Corrêa; Leila Maria Pessôa; Ighor A Zappes


Mastozoología neotropical | 2010

MORPHOMETRICS AND CYTOGENETICS OF Gracilinanus agilis AND Cryptonanus spp. (DIDELPHIMORPHIA: DIDELPHIDAE) FROM CENTRAL AND NORTHEASTERN BRAZIL

João Pedro Garcia; João Alves de Oliveira; Margaret Maria de Oliveira Corrêa; Leila Maria Pessôa


Archive | 2006

Morphological and Cytogenetic Analyses of Bibimys labiosus (Winge, 1887) (Rodentia, Sigmodontinae): Implications for its Affinities with the Scapteromyine Group

Pablo Rodrigues Gonçalves; João Alves de Oliveira; Margaret Maria de Oliveira Corrêa; Leila Maria Pessôa


Chromosome science | 2001

Karyotype analysis in South Atlantic perciforms Micropogonias furnieri and Abudefduf saxatilis

Mario Jorge Ignacio Brum; Margaret Maria de Oliveira Corrêa; Cecilia Teixeira de Aguilar


Chiroptera Neotropical | 2010

The karyotype of Macrophyllum macrophyllum (Schinz, 1821) (Phyllostomidae: Phyllostominae) from the state of Bahia, Brazil

Isabel A. Sbragia; Margaret Maria de Oliveira Corrêa; Leila Maria Pessôa; João Alves de Oliveira

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Leila Maria Pessôa

Federal University of Rio de Janeiro

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João Alves de Oliveira

Federal University of Rio de Janeiro

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Ana Lazar Gomes E Souza

Federal University of Rio de Janeiro

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Cecilia Teixeira de Aguilar

Federal University of Rio de Janeiro

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Mario Jorge Ignacio Brum

Federal University of Rio de Janeiro

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Ana Lazar

Oswaldo Cruz Foundation

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Carla Carneiro de Oliveira

Federal University of Rio de Janeiro

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Daniela Dias

Oswaldo Cruz Foundation

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Gisele Lessa

Universidade Federal de Viçosa

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