Allozyme analysis was used to determine patterns of genetic variation and relationships within the genus Valencia, a group with two allopatric species, V. letourneuxi inhabiting the Balkan Peninsula, and V. hispanica which is endemic to the Iberian Peninsula. Products of 25 gene loci were analysed with AK*, FH*, LDH-2* monomorphic when Fundulus heteroclitus macrolepidotus was not taken into account. Nine loci were diagnostic for both species of the genus Valencia. Levels of genetic variation of V. hispanica (P=0.416, H(v)=0.118) and V. lotourneuxi (P=0.160, H(v)=0.040) were higher than values reported previously. High population subdivision (F(M)=0.321) among V. hispanica populations indicates a clear interruption of genetic exchange among populations. High genetic variation and differentiation exhibited by populations of V. hispanica suggest that a recovery program should be carried out with natural stocks from the same localities.
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