South Russian Regional Center for Preparation and Implementation of International Projects Ltd

Rostov-na-Donu, Russia

South Russian Regional Center for Preparation and Implementation of International Projects Ltd

Rostov-na-Donu, Russia
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Zhulidov A.V.,South Russian Regional Center for Preparation and Implementation of International Projects Ltd | Kamari J.,Finnish Environment Institute | Robarts R.D.,Environment Canada | Pavlov D.F.,Russian Academy of Sciences | And 4 more authors.
Journal of Water and Climate Change | Year: 2011

A long-term study (1986-2002) of water-borne nutrient and suspended solids dynamics was undertaken on the lower Don River, which plays an extremely important role in the water supply of the Black Sea and Azov Sea basin. Suspended solids were greatest in spring and summer and were correlated to river discharge. Mean annual nitrogen concentrations increased from 1986 to 1995 and then decreased from 1996 to 2002. Unlike nitrogen, phosphorus concentrations (both phosphates and total phosphorus) gradually increased throughout the study period changing the river from an oligotrophic to upper mesotrophic status. If this trend continues phytoplankton could become nitrogen-limited leading to the development of nitrogen-fixing cyanobacterial blooms. No obvious relation between fertiliser usage over the Rostovskaya Oblast and nutrient dynamic patterns was identified, probably because only 10% of the water in the river comes from this area. The reason for the unusual and contradictory nitrogen and phosphorus changes remain largely unknown for this regulated river. © IWA Publishing 2011.


Zhulidov A.V.,South Russian Regional Center for Preparation and Implementation of International Projects Ltd | Kozhara A.V.,Russian Academy of Sciences | Nalepa T.F.,National Oceanic and Atmospheric Administration | Nalepa T.F.,University of Michigan | And 2 more authors.
Aquatic Invasions | Year: 2013

Relative abundance of two dreissenid species, Dreissena rostriformis bugensis and Dreissena polymorpha, in the total dreissenid community was calculated for 15 sites in the lower Don River system, Russia, between 1977 and 2010 to determine relative trends in their sympatric occurrence. The proportion of D. r. bugensis first increased at most stations reaching a maximum by 1999. However, after 1999, this species consistently decreased at 14 of the 15 sites. Degree of decline seems to correlate strongly to calcium content and total mineral content of the water. At sites in the Manych River with a higher Ca2+ and total mineral content, the proportion of D. r. bugensis in the total dreissenid population declined from 65-75% in 1999 to 14-22% by 2009-2010, whereas at sites in the Don River with lower Ca2+ and total mineral content its proportion declined from 25-50% to only 1%. However, Ca2+ and total mineral content cannot explain the synchronous and consistent long-term decrease in relative numbers as observed. D. r. bugensis normally displaces D. polymorpha over time due to superior physiological characteristics. Reasons for the decline of D. r. bugensis in the total dreissenid community are unclear, but given its synchronicity despite different times of invasion and hence species interactions we assume a macroregional factor affecting all the populations examined. © 2013 The Author(s).


Zhulidov A.V.,South Russian Regional Center for Preparation and Implementation of International Projects Ltd | Kozhara A.V.,Russian Academy of Sciences | Scherbina G.H.,Russian Academy of Sciences | Nalepa T.F.,National Oceanic and Atmospheric Administration | And 6 more authors.
Biological Invasions | Year: 2010

We examined trends in expansion patterns and relative abundances of Dreissenabugensis in reservoirs and major river systems in eastern Europe. Based on our own data and data from the literature, it is apparent that trends were variable across river basins and not easily related to environmental conditions. In some cases these did not conform to the patterns typically found for dreissenids. In the early period of expansion beyond its native range in the Dnieper-Bug delta and estuary, D. bugensis rapidly replaced Dreissena polymorpha in the upper Dnieper River system, but increased only gradually and over time became less abundant relative to D. polymorpha in the Don-Manych River system. Contrary to the Dnieper and Don River systems, in the Volga River system considerable spatial variability in relative abundances was apparent, particularly in northern reservoirs. Moreover, even though D. bugensis usually displaces D. polymorpha as the dominant dreissenid, the latter can remain dominant in certain types of habitats where conditions are less favourable for the former. Suggested factors that may be responsible for differences in invasion patterns in the river systems may include differential responses to temperature, or to some other factor(s) associated with geographical latitude, the level of water mineralization, and selective predation by molluscivorous fish. In particular, the northward expansion of D. bugensis seems to be limited by temperature. The lack of long-term data on appropriate scales precludes linking these differences to specific features within the environment, but our comparisons indicate that the expansion of D. bugensis relative to D. polymorpha is more complex than previously believed. © 2009 Springer Science+Business Media B.V.


PubMed | South Russian Regional Center for Preparation and Implementation of International Projects Ltd
Type: Journal Article | Journal: Environmental monitoring and assessment | Year: 2011

The Norilsk industrial ore smelting complex (Taymyr Peninsula, Russian Federation) has significantly impacted many components of local terrestrial and aquatic environments. Whether it has had a major impact on the wider Russian Arctic remains controversial as studies are scarce. From 1986 to 2004, data on heavy metal (Cu, Ni, Zn, Hg, Cd and Hg) concentrations in fish (burbot), moss, lichens, periphyton, hydric soils and snow in and around Norilsk and the most northern parts of the Taymyr Peninsula were analysed. Very high concentrations of Cu (203 g L 51 g L) and Ni (113 g L 15 g L) were found in the water of the Schuchya River close to Norilsk. Heavy metal concentrations in burbot liver were highest in Lake Pyasino near Norilsk compared to other study regions that were >100 km distant. From 1989-1996, Cu (121 g L 39 g L SD), Zn (150 g L) 70 g L) and Ni (149 g L 72 g L) snow concentrations were greatest in Norilsk, but were low elsewhere. By 2004, these concentrations had dropped significantly, especially for Cu-74 g L (18.7 g L SD), Zn-81.7 g L ( 31.3 g L SD) and Ni-80 g L(18.0 g L SD). Norilsk and its surroundings are subject to heavy pollution from the Norilsk metallurgical industry but these are absent from the greater Arctic region due to the prevailing winds and the Byrranga Mountains. Pollution abatement measures have been made so further investigations are necessary in order to assess their efficiency.

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