METACOMMUNITY THEORY IN ASSESSING THE ALGAL COMMUNITIES DIVERSITY OF THE “NYZHNIOSULSKYI” NATIONAL NATURAL PARK
DOI:
https://doi.org/10.32782/1998-6475.2025.59.18Keywords:
phytoplankton, phytoepiphyton, spatial factor, distance decay of similarityAbstract
The paper assesses the effect of spatial factor upon the diversity of local communities of phytoplankton and epiphytic algae in the “Nyzhniosulskyi” National Natural Park. The taxonomic diversity of phytoplankton local communities varied between 9 and 73 species (38±3 species at an average); the taxonomic diversity of epiphytic algal communities varied within 4–48 species (31±1 species at an average). Analysis of the spatial dynamics of the local algal communities has shown that in the river section and the river-lake section the epiphytic algal communities were marked by higher taxonomic diversity, than phytoplankton, and on the lake-island section, on the contrary, the phytoplankton taxonomic diversity was higher. The diversity of phytoplankton tends to increase downstream, while that of epiphytic algal communities does not. The Sørensen species similarity indices for local algal communities have been proven to be inversely related to the geographic (Euclidean) distance between the localities (observation sites). It shows that the spatial factor plays an important role in structuring the algal communities, and with geographic distance increasing the dispersal abilities of species decrease. The linear regression coefficients, representing the speed of distance decay of similarity, were much higher for phytoplankton, than for phytoepiphyton, which is typical for eutrophic ecosystems.
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