AOBPreview published online on March 31, 2004
Annals of Botany, doi:10.1093/aob/mch070
© 2004 by Annals of Botany Company
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Submitted on April 25, 2003
Affiliation of the authors:
1 Laboratorio de Genética de Poblaciones, Jardín Botánico Clavijero, Instituto de Ecología, A. C., Km. 2.5 Antigua Carretera a Coatepec No.351, Xalapa 91070, Veracruz, México;
2 Departamento de Sistemática Vegetal. Instituto de Ecología, A. C., Km. 2.5 Antigua Carretera a Coatepec No.351, Xalapa 91070, Veracruz, México
* To whom correspondence should be addressed. E-mail: astorga{at}ecologia.edu.mx.
• Background and Aims Genetic structure and variability were examined in the only three extant populations of the narrow-endemic tree Antirhea aromatica (Rubiaceae, Guettardeae), an endangered species of the tropical forest of eastern Mexico. Patterns of genetic diversity within and among populations for adult plants and seedlings were obtained. • Methods Allozyme electrophoresis of 15 loci was conducted and the data analysed with statistical approximation for obtaining genetic diversity, structure and gene flow. • Key Results The mean expected heterozygosity (He) in the adult and seedling populations was 0·18 ± 0·08 and 0·20 ± 0·09, respectively. The genetic variation explained by differences among populations was 51 and 35 %, for adult and seedling populations, respectively. On average, gene flow between paired adult populations was low (Nm = 0·26 ± 0·09), compared with other trees from the tropical forest. • Conclusions The results indicated that the populations evaluated have high genetic variability, compared with other endemic and geographically narrowly distributed plant species, in areas with high levels of environmental heterogeneity (e.g. tropical forests). The conservation implications of the results are discussed, and in this regard it is proposed that A. aromatica should be considered as an indicator species with economic potential. It is suggested that sustainable management practices should be implemented and that the areas where the species is distributed should be declared a natural reserve to ensure the species conservation.
Revised on October 16, 2003
Accepted on December 23, 2003
Genetic variability of the narrow endemic tree Antirhea aromatica Castillo-Campos & Lorence, (Rubiaceae, Guettardeae) in a tropical forest of Mexico
JORGE GONZÁLEZ-ASTORGA1* and GONZALO CASTILLO-CAMPOS2
Key words: Antirhea aromatica, endemic, genetic variability, conservation biology, tropical forest, Mexico.
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