GENIC AND MORPHOLOGICAL VARIATION OF THE PARTHENOGENETIC EARTHWORM APORRECTODEA-ROSEA IN SOUTHERN FINLAND (OLIGOCHAETA, LUMBRICIDAE)

The parthenogenetic earthworm Aporrectodea rosea (Savigny) showed a wi de electromorph ('clonal') heterogeneity in southern Finland with 46 ' clones' in a sample of 155 individuals. Individual clones were not ran domly distributed along an east-north-west sample transect. Clonal het erogeneity was highest in Inkoo in the West, where agriculture and hor ticulture have been practised longer and more intensively than in the other sample localities. Morphological characters related to soma and secondary reproductive organs varied according to locality, region, an d clone. With the exception of the protuberance of male pore terminali a, no clear-cut clinal trends were observed in the patterns of morphol ogical variability. However, application of a detrended correlation an alysis, which groups the clones according to their enzyme variant cons titution, indicated a separate cluster of clones, all of which were sa mpled in Inkoo. The worms representing these clustered clones were sig nificantly smaller, with a lower number of segments than the worms of the other clones sampled in Inkoo and in the other localities. This im plies that electrophoretic differences can be correlated with differen ces in morphological characters in parthenogenetic A. rosea.