Navegando por Autor "VINSON, Christina Cleo"

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Acesso aberto (Open Access)
Isolamento de microssatélites de espécies madeireiras no contexto da sustentabilidade genética no manejo florestal
(Universidade Federal do Pará, 2004-05-10) VINSON, Christina Cleo; Yamaguishi, Ana Yamaguishi; http://lattes.cnpq.br/7012636819010752; SAMPAIO, Maria Iracilda da Cunha; http://lattes.cnpq.br/2482763145819602
Aborda isolamento de microssatélites de espécies madeireiras no contexto da sustentabilidade genética no manejo florestal com o objetivo de isolar e caracterizar uma bateria de marcadores microssatélites para espécies arbóreas da Floresta Amazônica: Jacaranda copaia, Bagassa guianensis e Dipteryx odorata. Estes estudos vem sendo realizados como parte do projeto Dendrogene, e as análises genéticas populacionais posteriores fornecerão subsídios para conservação e manejo sustentável destas espécies.
Acesso aberto (Open Access)
Sciaenidae fish of the Caeté River estuary, Northern Brazil: mitochondrial DNA suggests explosive radiation for the Western Atlantic assemblage
(2004) VINSON, Christina Cleo; GOMES, Grazielle Fernanda Evangelista; SCHNEIDER, Horacio; SAMPAIO, Maria Iracilda da Cunha
Sciaenids are fish which are normally abundant in tropical estuaries of the western Atlantic. Studies on the Caeté river estuary in the northern Brazilian state of Pará have revealed that in this area Sciaenidae is the dominant family, comprising almost 50% of all teleosts sampled. In this paper we present the results of the first phylogenetic study on South American estuarine sciaenids, during which we obtained mitochondrial gene 16S sequences from 15 species belonging to eight genera occurring in the Caeté estuary. Intergeneric nucleotide divergences varied from 5 to 15%, Lonchurus and Menticirrhus being the most divergent lineages. Nucleotide divergences were quite variable amongst species of the same genus, ranging from 1.2% (Stellifer microps x Stellifer naso) to 8.4% (Menticirrhus americanus x Menticirrhus littoralis). Cladograms based on maximum parsimony, minimum evolution and maximum likelihood depicted an explosive diversification pattern for the western Atlantic sciaenid assemblage. Our analysis further reveals a very close relationship between Bairdiella and Stellifer, a monophyletic clade which emerged during the more recent diversification events of the Sciaenidae family. The phylogenetic reconstruction suggests the need for a revision of the taxonomy and nomenclature of the Bairdiella/Stellifer group.