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<oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'>
<dc:creator>Grandova, M.</dc:creator>
<dc:date>2020</dc:date>
<dc:description xml:lang='en'><p>The recent studies of planktonic communities of the lower Dniester were carried out mostly in spring and summer period, as the periods of the highest development of planktonic organisms. However, autumn and winter periods may reflect the influence of climatic changes on plankton even more clearly than spring and summer, for example, alterations in quantitative and qualitative structure of communities as the result of changes in vegetation terms of plankton species, and winter blooms of phytoplankton in the mild winters. The hydroecological history of Dniester River and Dniester estuary may be divided into three periods: 1. &ldquo;natural&rdquo; period, when the water regime depends on snow melting and frequent storm floods, with great runoff fluctuations and maximum of nutrient runoff in spring (about 60% of year runoff); 2. partially regulated period (starts in 1954 after Dubossary Reservoir and Dubossary Hydroelectric Power Plant were put in operation); 3. fully regulated period (from 1987 when Dniester Reservoir and Dniester Hydroelectric Power Plant were put in operation)[19]. Regulation smoothed seasonal fluctuations of the water runoff, and added the summer periods of high water, along which the runoff volume could be close to the spring values. During the eutrophication period (70th-80th), the concentration of nitrogen and phosphorus compounds increased in several times. Then in 90th, nutrient concentration began to decrease, and in the modern period, the concentrations of most nutrients exceed their level in 50th. Only the concentration of nitrates is several times higher, and the concentration of silicon is in contrary lower [19]. Phytoplankton communities response to the above changes of hydrological and hydrochemical regimes as well as to the global climatic changes. Thus, we face the problem of updating the data and search for new patterns in the changes of the biocenoses.</p></dc:description>
<dc:source>EU Integration and Management of the Dniester River Basin () 41-47</dc:source>
<dc:title>Changes in phytoplankton community of lower Dniester in 2018-2019</dc:title>
<dc:type>info:eu-repo/semantics/article</dc:type>
</oai_dc:dc>