Abstract
Three cultured strains of Prasiola stripitata were established from populations on shores of NW England (Hilbre), N Norway (Vardö) and SW Finland (Ören). Experiments were carried out on the effects of seawater salinity (6, 34, 68, 102%o) on these strains. All isolates showed significant differences in plantlet density in response to salinity, and density maxima at 34%o. The Ören culture density was least reduced at 6%.Growth of these isolates was also significantly affected by salinity and their patterns of response also differed significantly. The Hilbre strain proved to be the most vigorous in 68 and 102%o. The Ören strain performed best in 6 and 34%o and grew very poorly in 102%o. The responses of the Vardö isolate proved to be somewhat intermediate in character. Microevolutionary divergence can therefore occur in this taxon but the constraints imposed by the harsh conditions at high shore levels in all localities ensure that differences in salt tolerance between ecotypes will be small.
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