Animal key species of the ecosystems of western Ukraine

The attention in the article is paid to key species research importance. Their classification was discussed our published “Studia Biologica” (Y. Tsaryk, O. Reshetylo, I. Biol. Stud. 2019: 13(1); 161–168). main emphasis made on ecological species, while other categories were analyzed as well (protective, social etc.). A row of potential different ecosystems proposed based original field research. So, such phytophagous insects like alder leaf beetles Agelastica alni, Linaeidea aenea, and mother pearl moth Patania ruralis are be forest ecosystems. Altogether terrestrial common carder bee Bombus pascuorum buff-tailed bumblebee B. terrestris tend among pollinators (excluding European honey Apis mellifera). Ants important invertebrate well: Formica – ecosystems, Lasius, Myrmica Tetramorium shrub meadow ones. Almost same we can say about some amphibians (the toad Bufo bufo, frog Rana temporaria, edible Pelophylax esculentus). Eurasian jay Garrulus glandarius, great tit Parus major, woodpeckers, spotted woodpecker Dendrocopos major particular, birds’ minds. otter Lutra lutra possible freshwater Zooplankton a whole community might considered “species” too. pond snail Lymnaea stagnalis mollusks. fish Barbatula, Cobitis, Sabanejewia, Misgurnus genera, Eudontomyzon representatives streams rivers. beaver Castor fiber, L. lutra, white stork Ciconia ciconia, reed warblers thought semiaquatic presented data need further their population consortive organizations, functional role support ecosystem stability under environmental stochasticity, has clarified.