GENETIC DIFFERENTIATION IN HIPPOCREPIS-EMERUS (LEGUMINOSAE) - ALLOZYME AND DNA FINGERPRINT VARIATION IN DISJUNCT SCANDINAVIAN POPULATIONS

The structure of genetic variation in disjunct Scandinavian population s of Hippocrepis emerus was studied using allozymes and DNA fingerprin ting. Variation in the three native regional populations in Scandinavi a was compared with that in a recently introduced population in Sweden . In contrast to the recently introduced population, the native Scandi navian isolates of H. emerus showed high levels of allozyme fixation a nd low levels of DNA diversity. Variation in allozymes and at DNA fing erprint loci showed closely congruent patterns of geographic variation , with pronounced differentiation between the native Norwegian and Swe dish isolates of the species. The structure of genetic variation in na tive Scandinavian H. emerus is interpreted in terms of historical popu lation bottlenecks and founder events during the species' postglacial immigration into Scandinavia.