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The Journal of Heredity 2000:91(2)
© 2000 The American Genetic Association 91:134-141

Genetic differentiation and structure of Hippocrepis valentina (Leguminosae) populations

F González-Candelas*, and A Montolío

Institut Cavanilles de Biodiversitat i Biologia Evolutiva and Departament de Genètica, Universitat de Valencia, Edificio de Institutos, Campus de Paterna, Apartado de Correos 22085, 46071-Valencia, Spain *Corresponding author E-mail: fernando.ganzalez@uv.es

We present an analysis of isozyme variability in natural populations of the plant species Hippocrepis valentina (Leguminosae), which is endemic to the eastern Mediterranean coast of Spain and currently has endangered species status. Our results, obtained by starch-gel electrophoresis of 15 loci, show normal levels of variability for species with similar biology. The comparison with the patterns of genetic variability of two closely related species, H. balearica and H. grosii, confirms the taxonomic status of H. valentina as a proper species, independent of H. balearica, as previously suggested. The analysis of population subdivision shows that substantial variation among populations is present, and a hierarchical analysis demonstrates that when zones are defined according to their geographic location, a higher differentiation among populations within zones than among zones is found. Indirect estimates of gene flow indicate that levels of migration per generation are relatively low, except for a group composed of four populations, three of which are in close proximity. For the remaining populations, there is evidence of substantial differentiation. These results have implications for the design of a conservation strategy for this species.


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