Cladocera and Copepoda (Cyclopoida, Calanoida) of the mountain part of the Stryi river basin (Ukrainian Carpathians)

Abstract

The Cladocera, Cyclopoida and Calanoida species diversity of the mountain part of the Stryi river basin is described. The objects of research were found in 48 lenthic water bodies (Zhuravlyne lake, Yavirske reservoir, numerous ponds, puddles, swamps, springs, and wells) and on 7 sections of the Stryi and Yablunka rivers. 24 species of Cladocera, 23 Cyclopoida, and 1 Calanoida are found. The most diverse is the fauna of Lake Zhuravlyne, which is located in the Skole Beskydy National Nature Park. 56% of the species diversity of the mentioned groups is noted in ponds, 42% in puddles and swamps, 8% in springs and wells, 15% in rivers, 10% in Yavirske reservoir, 44% in Zhuravlyne. The fauna of the mountain part of the Stryi river basin includes 44% of the Cladocera, Cyclopoida and Calanoida species diversity of the territory of the Ukrainian Carpathians. Only Eudiaptomus transylvanicus is noted within Calanoida. Alona protzi, Eurycercus lamellatus, Simocephalus expinosus are found only in the study area within the Ukrainian Carpathians. The most common species in this area are Chydorus sphaericus (36% frequency of occurrence in the investigated lenthic water bodies) and Eucyclops serrulatus (55%). These species are the most common in the Ukrainian Carpathians as well. The highest total density of Cladocera and Cyclopoida was 253,5 thous.ind./m3. Daphnia obtusa, Alona protzi, Eucyclops subterraneus, Paracyclops poppei та Grateriella unisetigera are rare species for Lviv region. Eurycercus lamellatus, Simocephalus expinosus, Chydorus latus together with the previous species are rare for the Ukrainian Carpathians in total. 47% of the investigated lenthic water bodies are in oligosaprobic zone. The most valuable communities of the Cladocera, Cyclopoida and Calanoida exist in the Zhuravlyne lake, springs and wells near village Verkhnia Rozhanka, pools of the Vododilnyi masiff, riverbed of Stryi and the along-river reservoirs between the villages Zavadavivka and Yavora, and ponds near the village Dovge.