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Hydrobiological Journal
SJR: 0.227 SNIP: 0.575 CiteScore™: 0.24

ISSN 印刷: 0018-8166
ISSN オンライン: 1943-5991

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v53.i1.10
pages 3-16

The Long-term Dynamics and Distribution of Dreissena Veligers in the Cooling Pond of the Khmelnytsk NPP and Their Role in Zooplankton Structure

Yu. F. Gromova
Institute of Hydrobiology, National Academy of Sciences of Ukraine Kiev, Ukraine
A. A. Protasov
Institute of Biodiversity and Ecosystem Studies of Bulgarian Academy of Sciences, Sofia, Bulgaria; Institute of Hydrobiology National Academy of Sciences of Ukraine Kyiv, Ukraine

要約

Dynamics of abundance of Dreissena veligers along with quantitative characteristics of zooplankton in the cooling pond of the Khmelnytsk NPP was considered on the basis of the long-term observations (2005-2015). Average numbers and biomass of veligers in the cooling pond in summer and early autumn varied within the limits 38-103 353 specimens/m3 and 0.1-694.4 mg/m3. Over mass development (June - July) they served as an important component of zooplankton (on average up to 32.8% of total numbers and 19.4% of biomass). At the initial stage (2005), after Dreissena polymorpha (Pall.) invasion into the cooling pond (in 2002-2003) veligers were abundant, their portion in zooplankton numbers and biomass on average amounted to 15.0%. Maximums of their abundance were registered in July 2008 and June 2009, minimum - in September 2010. Invasion of Dreissena bugensis (Andr.) in 2012 did not notably affect zooplankton structure. Distribution of Dreissenà veligers in sections of the cooling pond as a rule was uneven. High abundance was character for the middle section of diapason of the thermal remoteness (ratio of temperature at the certain site and maximal temperature in the cooling pond - at point of the heated waters discharge). Heterogeneity of the veligers' distribution was conditioned by both temperature and hydrodynamics processes, which determine patterns of temperature characteristics in the given technogeneous water body. Quantitative characteristics of veligers decreased along with wind-directed technogeneous current.