Data/hora: 08/06/2024 18:23:42

Provedor de dados: 	39	
País: 	Brazil	
Título: 	Genetic differentiation of the neotropical tree species Protium spruceanum (Benth.) Engler (Burseraceae) between fragments and vegetation corridors in Brazilian Atlantic forest	
Autores: 	Vieira,Fábio de Almeida; Carvalho,Dulcinéia de.	
Data: 	2009-12-01	
Ano: 	2009	
Palavras-chave: 	Allozymes; F-statistics; Genetic diversity; Habitat fragmentation.	
Resumo: 	We studied patterns of genetic differentiation in a connected landscape with an interesting history of human habitat conversion that began two centuries ago, during the Brazilian colonization period. In the fragments of Brazilian Atlantic seasonal forest and corridors of secondary forest, Protium spruceanum is an abundant native, mass-flowering/insect-pollinated and bird-dispersed tree. Genetic diversity was analyzed from 230 individuals in five fragments (1 to 11.8 ha) and four corridors (460 to 1000 m length) using allozyme loci. We did not find evidence of inbreeding within fragments or corridors, but the proportion of heterozygotes (&lt;IMG SRC="/img/revistas/abb/v23n4/a28simb1.gif" WIDTH=287 HEIGHT=96&gt;) were significantly higher in fragments than in the secondary vegetation corridors, based on Goudet's G-test (P = 0.036). Genetic differentiation was low and no pattern of isolation by distance was detected. All fragments generally present low historical genetic differentiation with corridors that they are connected, indicating possible gene flow via seeds and pollen. Due to the consistently low differentiation observed among them and the absence of a significant reduction in gene diversity in second-growth forests, we conclude that corridors of second-growth forests would be an important alternative in the genetic connection of isolated forest fragments.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000400028	
Editor: 	Sociedade Botânica do Brasil	
Relação: 	10.1590/S0102-33062009000400028	
Formato: 	text/html	
Fonte: 	Acta Botanica Brasilica  v.23 n.4 2009	
Fonte: 	info:eu-repo/semantics/openAccess