Genetic structure of honeybee populations from southern Brazil and Uruguay
Genet. mol. biol
;
26(1): 47-52, Mar. 2003. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-336058
RESUMO
Apis mellifera scutellata was introduced to Brazil in 1956 and Africanized honeybee populations have now spread from Argentina to the southwestern United States. Temperate climatic restrictions seem to be a natural limit to Africanized honeybee expansion around parallels 35º to 40º SL. We used allozyme loci (Mdh-1 and Hk-1) and mtDNA haplotypes to characterize honeybee populations in southern Brazil and Uruguay and define a possible transition area between Africanized and European bees. Samples of 194 bee colonies were collected from ten localities between 30º-35º SL and 52º-59º WL. The mtDNA restriction patterns of these colonies were obtained through digestion of the mitochondrial genome by Eco RI, or by digestion by Bgl II and Xba I of the cytochrome B locus and the COI-COII intergenic region, respectively. The distribution limit of African bee colonies, i.e., those populations with only the African mtDNA haplotype and with a high proportion of African genes as shown by allozyme analysis, is located in northern Uruguay, with a hybridization zone located farther south in Uruguay. A gradual cline from north to south was observed, confirmed by mtDNA, racial admixture, and genetic distance analyses. No evidence of either gametic disequilibrium between nuclear markers or cytonuclear disequilibrium among the nuclear and mtDNA genotypes was detected, suggesting that the hybridization process has been completed
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Uruguai
/
Abelhas
/
Brasil
/
DNA Mitocondrial
/
Genética Populacional
Limite:
Animais
País/Região como assunto:
América do Sul
/
Brasil
/
Uruguai
Idioma:
Inglês
Revista:
Genet. mol. biol
Assunto da revista:
Genética
Ano de publicação:
2003
Tipo de documento:
Artigo
País de afiliação:
Brasil
/
Estados Unidos
Instituição/País de afiliação:
USP/BR
/
Universidade Estadual de Londrina/BR
/
Universidade Federal de São Carlos/BR
/
Washington State University/US
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