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Hydrobiological Journal
SJR: 0.217 SNIP: 0.575 CiteScore™: 0.24

ISSN Druckformat: 0018-8166
ISSN Online: 1943-5991

Volumes:
Volumen 55, 2019 Volumen 54, 2018 Volumen 53, 2017 Volumen 52, 2016 Volumen 51, 2015 Volumen 50, 2014 Volumen 49, 2013 Volumen 48, 2012 Volumen 47, 2011 Volumen 46, 2010 Volumen 45, 2009 Volumen 44, 2008 Volumen 43, 2007 Volumen 42, 2006 Volumen 41, 2005 Volumen 40, 2004 Volumen 39, 2003 Volumen 38, 2002 Volumen 37, 2001 Volumen 36, 2000 Volumen 35, 1999 Volumen 34, 1998

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v55.i1.20
pages 18-35

Response of Phytoplankton of the Kiev Reservoir to the Increase in Summer Temperatures

V. I. Shcherbak
Institute of Hydrobiology National Academy of Sciences of Ukraine Kiev, Ukraine

ABSTRAKT

It has been found that in 2011-2016 global and local climatic changes in the ecosystem of the Kiev Reservoir manifested themselves in excessive summer temperatures of the water: in the surface layers of water - to 27.2-28.8°C, whereas in its near-bottom layers - to 25.9-26.6°C. The response of phytoplankton to excessive temperatures manifested itself in changes in its taxonomic diversity, abundance, structural organization, and in the processes of production and decomposition. At the present time, Chlorophyta, Bacillariophyta, and Cyanoprokaryota are highly diverse in their species composition. However, small-sized Chrysophyta and Cryptophyta also contribute significantly to the total number of phytoplankton species (8 and 5 species and 17 and 8%, respectively). Previously they occurred only in early spring. On the whole, two types of algal communities differing in their species composition, abundance, and structure are formed depending on water temperature. A direct relationship was established between the excessive temperature of water registered in summertime and the intensity of Cyanoprokaryota and Chlorophyta development. At the same time, the intensity of Bacillariophyta development depended inversely on summer temperature. The maximal values of the total, net primary production, and organic matter decomposition significantly differed from their minimal values. On the whole, the excessive summer temperatures of the water did not result in the irreversible changes in the structural and functional organization of phytoplankton belonging to the main component of the autotrophic chain of the ecosystem of the Kiev Reservoir.


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