Evaluating Water Quality in a Large River System in the Northern European Russia by Macrozoobenthos

Flow regulation is one of the most common anthropogenic factors affecting rivers worldwide. In Korea, 16 weirs were constructed along four major rivers from 2009 to 2012. This study aimed to elucidate initial changes in physical, chemical, and biological variables after the construction of consecutive weirs on the Nakdong River, a major large river system. Water quality variables and phytoplankton cell densities were investigated at eight representative sites and compared with the data recorded before the weir construction. There were spatial and temporal changes in the hydraulic retention time (HRT), total phosphorus (TP), and chlorophyll a concentrations among the eight weir sections. HRT increased after the weir construction, while TP and chlorophyll a tended to decrease from the middle to lower section of the Nakdong River. Furthermore, differences were observed in the phytoplankton community composition between 2006–2007 and 2013. There was a marginal decrease in the duration of centric diatom (Stephanodiscus hantzschii) blooms after weir construction. However, Microcystis aeruginosa proliferated more extensively during summer and autumn than it did before the weir construction. Our results suggest that changes in hydrological factors, in response to consecutive weir construction, may contribute to greater physical, chemical, and ecological variability.

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Marginal formations of the last Kara and Barents ice sheets in northern European Russia

Boreas ◽

10.1111/j.1502-3885.1999.tb00205.x ◽

1999 ◽

Vol 28 (1) ◽

pp. 23-45 ◽

Cited By ~ 69

Author(s):

VALERY I. ASTAKHOV ◽

JOHN INGE SVENDSEN ◽

ALEXEI MATIOUCHKOV ◽

JAN MANGERUD ◽

OLGA MASLENIKOVA ◽

...

Keyword(s):

Ice Sheets ◽

European Russia ◽

Northern European ◽

Northern European Russia

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Butterflies (Lepidoptera: Papilionoidea and Hesperioidea) from meadows of Vinogradovsky District, Arkhangelsk Region, northern European Russia, with notes on recent intense expansion of the southern species to the north

Check List ◽

10.15560/11.5.1727 ◽

2015 ◽

Vol 11 (5) ◽

pp. 1727

Author(s):

Ivan N. Bolotov ◽

Irina A. Bochneva ◽

Marina V. Podbolotskaya ◽

Mikhail Yu. Gofarov ◽

Vitaly M. Spitsyn

Keyword(s):

Agricultural Land ◽

European Russia ◽

Butterfly Species ◽

Arkhangelsk Region ◽

Pararge Aegeria ◽

The North ◽

Northern European ◽

Butterfly Assemblages ◽

Butterfly Fauna ◽

Northern European Russia

The Vinogradovsky District is located at the center of the Arkhangelsk Region, one of the largest federal subjects of Northern European Russia. Boreal spruce forests are the prevalent ecosystem type in this area, but large expanses of agricultural land and herb-grass meadows are also presented there. Based on the studies of 1,699 specimens collected from three meadow sites during period 2011–2013, we provide the first data on the butterfly fauna of the district, which include 56 species, belonging to 35 genera and 5 families. Our data reveal an intense northward expansion of many southern butterfly species to the Arkhangelsk Region, including migrants (Pontia edusa, Issoria lathonia, Vanessa atalanta and Vanessa cardui) and species that have established resident populations there (Pararge aegeria, Nymphalis xanthomelas, Aglais io, Lycaena dispar, Cupido alcetas). Quantitative data on species diversity and phenology of butterflies are reported, including analysis of structure of butterfly assemblages and their seasonal changes.

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Quantification of DOC concentrations in relation with soil properties of soils in tundra and taiga of Northern European Russia

Biogeosciences Discussions ◽

10.5194/bgd-7-3189-2010 ◽

2010 ◽

Vol 7 (3) ◽

pp. 3189-3226 ◽

Cited By ~ 13

Author(s):

M. R. Oosterwoud ◽

E. J. M. Temminghoff ◽

S. E. A. T. M. van der Zee

Keyword(s):

Organic Carbon ◽

Climate Changes ◽

European Russia ◽

Mineral Solubility ◽

Northern European ◽

Carbon Compounds ◽

Northern Regions ◽

Doc Concentration ◽

Chemical Modelling ◽

Northern European Russia

Abstract. Potential mobilization and transport of Dissolved Organic Carbon (DOC) in subarctic river basins towards the oceans is enormous, because 23–48% of the worlds Soil Organic Carbon (SOC) is stored in northern regions. As climate changes, the amount and composition of DOC exported from these basins are expected to change. The transfer of organic carbon between soils and rivers results in fractionation of organic carbon compounds. The aim of this research is to determine the DOC concentrations, its fractions, i.e. humic (HA), fulvic (FA), and hydrophilic (HY) acids, and soil characteristics that influence the DOC sorptive properties of different soil types within a tundra and taiga catchment of Northern European Russia. DOC in taiga and tundra soil profiles (soil solution) consisted only of HY and FA, where HY became more abundant with increasing depth. Adsorption of DOC on mineral phases is the key geochemical process for release and removal of DOC from potentially soluble carbon pool. We found that adsorbed organic carbon may desorb easily and can release DOC quickly, without being dependent on mineralization and degradation. Although Extractable Organic Carbon (EOC) comprise only a small part of SOC, it is a significant buffering pool for DOC. We found that about 80–90% of released EOC was previously adsorbed. Fractionation of EOC is also influenced by the fact that predominantly HA and FA adsorbed to soil and therefore also are the main compounds released when desorbed. Flowpaths vary between taiga and tundra and through seasons, which likely affects DOC concentration found in streams. As climate changes, also flowpaths of water through soils may change, especially in tundra caused by thawing soils. Therefore, adsorptive properties of thawing soils exert a major control on DOC leaching to rivers. To better understand the process of DOC ad- and de-sorption in soils, process based soil chemical modelling, which could bring more insight in solution speciation, mineral solubility, and adsorption reactions, is appropriate.

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