Influence of temperature on the aquatic biota

Abstract

Detailed analysis of temperature indicators of Kremenchug reservoir in August showed a tendency to increase the coefficient of their variation (Cv=10.69–13.97%). This indicates the unstability and stress of the temperature conditions of the aquatic environment for living organisms. First of all, it will affect the organisms of near-flood layers of water which are in direct contact with unstable air masses. (Cv=28.45–31.45%). Blue-green algae species which were the most resistant to temperature fluctuations are Microcystis aeruginosa Kutz. emend. Elenkin and Anabaena flos-aquae sp. Their maximum values were recorded in the water area near the village Chervona Sloboda. An impact of a temperature factor and a number of other abiotic factors leads to intensive water «bloom» and subsequent mass extinction of algae Cyanophyta. Hot sunny days with the air temperature up to 18-32°C and water of temperature 21.0–25.8°C are most dangerous. As a result of lethal consequences, significant amounts of the most sensitive species of aquatic living organisms fall out of the ecosystem: Noble ?rayfish (Astacus astacus), Zander (Sander lucioperca). The presented data reflect the process of global warming. Keywords: Temperature; Ecological conditions; Aquatic organisms; Kremenchug Reservoir References Bat-oyun Tserenpurev, Masato, S., Mitsuru, T. (2012). Effects of cloud, atmospheric water vapor, and dust on photosynthetically active radiation and total solar radiation in a Mongolian grassland. Journal of Arid Land, 4(4), 349-356. Doi: 10.3724/SP.J.1227.2012.00349. Birungi, Z., Masola, B., Zaranyika, M.F., Naigaga, I. & Marshall, B. (2007). Active biomonitoring of trace heavy metals using fish (Oreochromis niloticus) as bioindicator species. The case of Nakivubo wetland along Lake Victoria. Physics and Chemistry of the Earth, Parts A/B/C, 32(15–18), 1350–1358. Doi: http://dx.doi.org/10.1016/j.pce.2007.07.034 Crayfish and fish die en masse in the Dnieper in Cherkasy region. (2016). TV channel VIKKA-news. News archive. 8 August, 16-46. EU Water Framework Directive (2010). DIRECTIVE 2000/60/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 23 October 2000 establishing a framework for Community action in the field of water policy. Gorbunova, Z.N., Medved', V.A., & Borisova, Ye.V. (2001). Transformation of urea during the growth of some blue-green (Cyanoprocaryota) and green (Chlorophyta, Chlorococcales) algae. International Journal on Algae, 3(4). Krishnamurthy, T., Carmichael, W.W. & Sarver, E.W. (1986). Toxic peptides from freshwater cyanobacteria (blue-green algae). I. Isolation, purification and characterization of peptides from Microcystis aeruginosa and Anabaena flos-aquae. Toxicon, 24(9), 865-73. doi: 10.1016/0041-0101(86)90087-5. Kruzhilina, S.V. (2010). Perennial dynamics of quantitative development of phytoplankton of Kremenchug reservoir and its structural indicators. Rybogospodarska nauka Ukrainy, 3, 14-19. Likhareva, E.I. (1989). Possibilities of restoring crayfish stocks in water bodies of the Leningrad Region 1. Elements of crayfish biology. Collected papaers of the State Research Institute of Lake and River Fisheries, 300, 10. Lopes, I., Baird, D.J., & Ribeiro, R. (2006). Genetic adaptation to metal stress by natural populations of Daphnia longispina. Ecotoxicology and Environmental Safety, 63(2), 275–285. Doi: http://dx.doi.org/10.1016/j.ecoenv.2004.12.015 Results of the analysis of water samples of the Kremenchug reservoir in 3rd quarter of 2012. (2012) Cherkasy. Official portal of the city council. October 26. Romanenko, V.D. (2006). Methods of hydroecological research of surface waters. Kyiv: L?g?s. Sirenko, L.A. & Kirpenko, Yu.A., (2000). Biologically Active Metabolites of Blue-Green Algae and Their Role in Epidemiology. Hydrobiological Journal, 36 (5), 14. Doi: 10.1615/HydrobJ.v36.i5.110