Continuity and discreteness of taxonomic structure of contour algal communities in the Dnipro reservoirs (Ukraine)

• Datum: 2025
• Hauptverfasser: Semeniuk, N.Ye., Shcherbak, V.I., Davydov, O.A., Koziychuk, E.Sh.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: M.G. Kholodny Institute of Botany, NAS of Ukraine 2025
• Online Zugang: https://algologia.co.ua/journal/article/view/35.4.253
• Назва журналу: Algologia

Taxonomic diversity of contour algal communities (microphytobenthos and phytoepiphyton) of Kyiv and Kaniv reservoirs in the summer of 2021 comprised 327 species (339 infraspecies taxa, ist) from 8 phyla. In Kyiv Reservoir 268 ist were identified, with microphytobenthos represented by 199 taxa, and phytoepiphyton represented by 159 taxa. For Kaniv Reservoir these values make 202 and 147 taxa respectively. The contour algal communities were dominated by Bacillariophyta, Chlorophyta and Cyanobacteria. The leading families were Bacillariaceae, Scenedesmaceae, Naviculaceae, Cymbellaceae, Gomphonemataceae; the leading genera — Nitzschia, Gomphonema, Desmodesmus, Navicula, Eunotia. Cluster analysis of algal communities according to Sorensen similarity coefficient distinguised three large clusters: microphytobenthos of Kyiv Reservoir, microphytobenthos of Kaniv Reservoir, phytoepiphyton of the reservoirs under study. The effect of spatial factor on algal communities has been assessed with the Distance Decay of Similarity, that is the relation between the species similarity of local communities and the geographic distance between the localities. The linear regression equations show, that the highest degree of distance decay of similarity (а = –0.001) had phytoepiphyton, the lower — microphytobenthos of the shallow water areas (а = –0.0007) and the lowest (а = –0.0004) — microphytobenthos of the deep water areas. Thus, phytoepiphyton had the highest degree of discreteness. It can be explained by heterogeneity of the habitat conditions (aquatic vascular plants as substrata). On the contrary, the highest degree of continuity was observed for microphytobenthos of the deep water areas, referring to «transit» areas, where water turnover facilitates exchange of species among the local algal communities.