AOBPreview originally published online on October 31, 2002
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Annals of Botany 90: 725-733, 2002
© 2002 Annals of Botany Company
Allozyme Diversity in Natural Populations of Viola palmensis Webb & Berth. (Violaceae) from La Palma (Canary Islands): Implications for Conservation Genetics
1 Departamento de Biología, Universidad de Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017 Las Palmas, Canary Islands, Spain
* For correspondence. Fax +34 928 452922, e-mail psosa{at}dbio.ulpgc.es
Received: 1 May 2002; Returned for revision 24 June 2002; Accepted: 29 August 2002 Published electronically: 31 October 2002
Genetic diversity was measured by allozyme electrophoresis in eight natural populations of the threatened Canarian endemic Viola palmensis Webb & Berth. (Violaceae). Nineteen alleles corresponding to 11 gene loci were detected. High levels of genetic diversity were found, ranging from 36·3 to 45·4 % for the percentage of polymorphic loci (P), from 1·45 to 1·60 for the average number of alleles per locus (A) and from 0·128 to 0·200 for the expected heterozygosity (He). Between 85·5 and 96·6 % of genetic variability was apportioned within populations. As a whole, populations were not at Hardy–Weinberg equilibrium, with a deficit of heterozygous individuals attributable to the existence of genetic structuring in the populations analysed. The levels of interpopulation genetic differentiation were low (mean FST = 0·100), while genetic identity pair-wise comparisons were high (mean I = 0·973) suggesting considerable levels of gene flow among populations. No relationship was detected between genetic differentiation and geographical distances between populations. An outcrossing insect-mediated breeding system might contribute to pollen dispersion of this species. For conservation genetics we suggest in situ preservation areas are defined that are free of disturbance and that include populations with the highest genetic diversity.
Key words: Allozymes, Canary Islands, conservation genetics, gene flow, genetic diversity, Viola palmensis.
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