Amoebozoa Luhe, 1913 in the water bodies of the Vinnytsia region

In the reservoirs of the Vinnytsia region, we have identified 12 species of naked amoebas. This species: Saccamoeba stagnicola Page, 1974, Saccamoeba sp., Thecamoeba striata (Penard, 1890) Schaeffer, 1926, Stenamoeba stenopodia (Page, 1969) Smirnov et al., 2007, Mayorella cantabrigiensis Page, 1983, Mayorella sp., Korotnevella diskophora Smirnov, 1999, Vexillifera sp., Acanthamoeba sp. (1), Cochliopodium sp., Vahlkampfia sp. (1), Vahlkampfia sp. (2). Two species of naked amoebae (Vahlkampfia sp. (1), Vahlkampfia sp. (2)) belong to heterolobosea amoeba from the group Discoba Simpson in Hampl et al., 2009. In terms of frequency of occurrence, the most common were the amoeba Vahlkampfia sp. (2), Vahlkampfia sp. (1), the least common are Acanthamoeba sp. (1), M. cantabrigiensis, S. stagnicola, Saccamoeba sp., Vexillifera sp., Mayorella sp., K. diskophora, the middle position on the frequency of occurrence is species of Cochliopodium sp., T. striata, S. stenopodia. The species lists of naked amoebas in the reservoirs of the Vinnytsia region are combined into two complexes. The first complex (swamps) contained the amoeba Vahlkampfia sp. (1), in the second (rivers and floodplain water bodies) – S. stagnicola, Saccamoeba sp., T. striata, S. stenopodia, M. cantabrigiensis, Mayorella sp., K. diskophora, Vexillifera sp., Acanthamoeba sp. (1), Cochliopodium sp., Vahlkampfia sp. (1), Vahlkampfia sp. (2). The formation of species complexes of naked amoebae in the water of Vinnytsia region affected by water temperature, water acidity, concentration of dissolved oxygen in the water and organic substances (permanganate oxidizability). The species found by us belong to 7 morphotypes: eruptive, monopodial, striate, lingulate, mayorellian, dactylopodial, acanthopodial, lens-like.

FORMING OF FALSE ANNUAL RINGS ON SCALES OF JUVENILE COHO SALMON ONCORHYNCHUS KISUTCH IN THE UPPER REACHES, FLOODPLAIN OLD WATER BODIES AND LAKES IN THE MIDDLE AND LOWER REACHES OF THE KAMCHATKA RIVER

Structure of scales is investigated for coho salmon juveniles from several sites of their feeding in the Kamchatka River basin, from Pushchino (685 km from the river mouth) to Lake Nerpichye (at the mouth). The underyearlings begin their migrations over the river basin to individual plots soon after their emerging from nests, only part of them feed and winter at the spawning grounds (between Pushchino — Milkovo). A number of coho juveniles stay for feeding and wintering in the tributaries of the Kamchatka River, some of them migrate during spring–summer floods (mid May–June) to the old water bodies in its upper and middle reaches (near Milkovo, Dolinovka, Taezhny, Dedova Yurta, Lake Kulpik) and to the floodplain and lagoon–estuary lakes (Lake Kurazhechnoye, Lake Kursin, and others), having or yet having no scales. Aboriginal coho salmon never spawn in these floodplain water bodies, but the juveniles are observed there all the year round. After wintering, seasonal growth and forming a zone of closely-spaced sclerites of scale (ZCS) — annual ring start in early May or middle May (till early June for some individuals), both for coho yearlings and older juveniles. An additional ZCS (1st type) can be formed earlier on the coho scale in some lakes because of the feeding change. Besides, another additional ZSC (2nd type) can be formed on the scale of coho yearlings (1+) in the old water bodies at Dolinovka, Taezhny, Dedova Yurta, in the lakes Kulpik, Kurazhechnoye, Kursin, and Azabachye and in the Azabachya Channel (at the Dyakonovsky Brook) in late July — August because of seasonal changes in the feeding.