Molecular Systematics
Mostrando 25-36 de 59 artigos, teses e dissertações.
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25. Systematics of Helieae Gilg (Gentianaceae) / Sistemática de Helieae Gilg (Gentianaceae)
Helieae, one of the six Gentianaceae tribes, comprises about 23 genera and over 200 species found exclusively in the Neotropics. It is a highly diverse assemblage of plants, which have traditionally been problematic regarding generic circumscriptions. Several Helieae genera were understudied and phylogenetic relationships within the tribe were unclear. On th
Publicado em: 2009
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26. Sistemática e biogeografia do grupo Rhinella marina (Linnaeus, 1758) (Anura: Bufonidae)
This research aims the study of systematics and biogeography of the species in Rhinella marina group (Linnaeus, 1758). The present dissertation was structured in three chapters. The irst chapter presents the description of two new species, throughout central Brazil, and also focuses discussions about the taxonomy of the group. The second chapter investigated
Publicado em: 2008
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27. Biodiversity and molecular phylogeny of Phreatobiidae (Ostariophysi, Siluriformes) - with a proposal about its phylogenetic placement within Siluriforme and a discussion on the evolution of the subterranean habit / Biodiversidade e sistemática molecular de Phreatobiidae (Ostariophysi, Siluriformes) - com uma proposta sobre sua posição filogenética em Siluriformes e uma discussão sobre a evolução do hábito subterrâneo
Samples from different species of Phreatobius were collected in order to obtain molecular data from nuclear RAG-2 gene sequence potentially informative to resolve phylogenetic relationships of the genus. The data on Phreatobiidae were combined with equivalent sequence information from representatives of several other siluriform families, and analyzed by maxi
Publicado em: 2008
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28. General trends in world biogeographic literature: a preliminary bibliometric analysis
Records with the search string biogeograph* were collected from the Science Citation Index (SCI). A total of 3456 records were downloaded for the 1945-2006 period from titles of articles and reviews, and 10,543 records were downloaded for 1991-2006, taking into consideration also abstracts and keywords. Temporal trends of publications, geographical and insti
Revista Brasileira de Entomologia. Publicado em: 2008
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29. Sistemática morfológica e molecular de ácaros fitófagos do gênero Brevipalpus Donnadieu de importância econômica e quarentária para o Brasil / Morphological and molecular systematics of phytophagous mites of brevipalpus donnadieu genus of economic and quarantine importance to Brazil
Brevipalpus Donnadieu is the most importante genus in the Tenuipalpidae family. This genus presents about 300 species distributed around the world. Brevipalpus mites present agricultural importance because they are pests of several crops and especially due to their role as vectors of serious plant viroses. In Brazil, the main Brevipalpus species are B. phoen
Publicado em: 2008
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30. Molecular studies with accipitrids (Aves, Accipitridae): an evolutionary perpective / Estudos moleculares em acipitrídeos (Aves, Accipitridae): uma perspectiva evolutiva
A família Accipitridae representa uma das maiores radiações de aves atuais, ocupando habitats diversos em grande parte do planeta. Entre as divisões propostas para a família no passado, o grupo dos gaviões buteoninos figura entre um dos poucos que se aproximam em composição a uma linhagem monofilética, de acordo com análises filogenéticas recentes
Publicado em: 2008
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31. Sistemática de Anthurium sect. Urospadix (Araceae) / Systematics of Anthurium sect. Urospadix (Araceae)
We present a phylogenetic analysis of Anthurium sect. Urospadix and related groups (Araceae). The genus has traditionally been considered taxonomically difficult and there has been little resolution of relationship within it. We performed parsimony analyses on morphological and molecular, and combined data sets. Anatomical characters have been used in classi
Publicado em: 2007
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32. Molecular systematics and wing morphometric variation in species of the Drosophila tripunctata radiation / Sistematica molecular e variação morfometrica da asa de especies de Drosophila da radiação tripunctata
The tripunctata group is the second largest Neotropical group of Drosophila in number of species and was included in the tripunctata radiation which comprises other closely related groups. The second chromosome of Drosophila mediopunctata (a species that belongs to the tripunctata group) is highly polymorphic for inversions. Previous work suggested the pr
Publicado em: 2007
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33. Estudo taxonômico das espécies com folhas planas a conduplicadas do gênero Octomeria R.Br. (Orchidaceae) / Taxonomic study of the species with flat to conduplicate leaves of the genus Octomeria (Orchidaceae)
Octomeria é um gênero neotropical que ocorre desde a América Central, Antilhas, Colômbia, Venezuela, Guiana, Suriname, Guiana Francesa, Suriname, Equador, Peru, Bolívia, Brasil, Paraguai até o Norte da Argentina. O gênero compreende aproximadamente 150 espécies, com importantes centros de diversidade, nas Guianas, Bacia Amazônica e especialmente o S
Publicado em: 2007
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34. Molecular trees of trypanosomes incongruent with fossil records of hosts
Molecular trees of trypanosomes have confirmed conventionally accepted genera, but often produce topologies that are incongruent with knowledge of the evolution, systematics, and biogeography of hosts and vectors. These distorted topologies result largely from incorrect assumptions about molecular clocks. A host-based phylogenetic tree could serve as a broad
Memórias do Instituto Oswaldo Cruz. Publicado em: 2006-02
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35. Molecular and genetics evolution of the period gene population and multilocus analysis of introgression in Phlebotomine sandflies (Diptera: Psychodidae: Phlebotomina) / Evolução molecular e genética de populações do gene period e análise multilocus da introgressão em flebotomíneos neotropicais (Diptera: Psychodidae: Phlebotominae)
Phlebotomine sandflies (Diptera: Psychodidae) are the only insects incriminated as vectors of leishmaniasis in the World. In this thesis, the clock gene period was used as a marker in molecular evolution and population genetics studies in neotropical sandflies. A multilocus analysis was also performed to investigate the occurrence of introgression. In the mo
Publicado em: 2006
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36. Molecular phylogeny of the genus Saguinus (Platyrrhini, Primates) based on the ND1 mitochondrial gene and implications for conservation
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 elucida
Genetics and Molecular Biology. Publicado em: 2005-03