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On two Croatian islands, Veruda and Ugljan, cyanobacterial communities and their composition were surveyed. The cyanobacterial composition in the splash zone was examined in horizontal and vertical directions. Statistical analysis shows the vertical gradient as the strongest one on the contrary the horizontal distribution does not reflect any pronounced differences between the islands. The species diversity and distribution is not dependent on the orientation of the locality toward the cardinal points. The study highlights the importance of high-density sampling in the vertical and also the horizontal direction for covering sufficiently the species richness of the site.

Cyanobacterial communities of the splash zone of two Croatian islands, Veruda and Ugljan, were surveyed on 16 localities both in horizontal and vertical directions. In 336 samples 42 cyanobacterial species, 1 green alga, and 1 red alga were found. On both islands Hyella spp. and Gloeocapsopsis crepidinum dominated. Solentia spp., Kyrtuthrix dalmatica, and Mastigocoleus testarum were also found frequently. According to statistical analyses 3 horizontal parts of the splash zone were shown to host different cyanobacterial communities. In the horizontal direction there were no statistical differences among sampling points; however, for uncovering the whole cyanobacterial diversity more samples from various distances are necessary. The species diversity and distribution were not dependent on the orientation of the locality toward cardinal points.

A primary study of cyanobacteria of the splash zone from the dalmatic coast has been executed. Samples were taken from 7 localities. There were found 36 species of cyanobacteria but only 27 were determined (21 epilithic and 6 endolithic species). The results were compared with other similar studies. There was made a check list of all possible species of the splash zone all over the world and the cyanobacteria were also compared with the results of the project.