The influence of seasonal and year-to-year variability of water discharge from the Lake Ladoga?Neva River system on the salinity regime of the Baltic Sea

Hydrobiologia ◽  
1996 ◽  
Vol 322 (1-3) ◽  
pp. 99-102 ◽  
Author(s):  
Nataliya V. Myakisheva
Keyword(s):  
Baltic Sea ◽  
Water Discharge ◽  
River System ◽  
Lake Ladoga ◽  
The Baltic Sea ◽  
Salinity Regime ◽  
Neva River ◽  
The Baltic

scholarly journals Temporal Trends in Phosphorus Concentrations and Losses from Agricultural Monitoring Sites in Latvia

2021 ◽  
Vol 25 (1) ◽  
pp. 233-242
Author(s):  
Ieva Siksnane ◽  
Ainis Lagzdins
Keyword(s):  
Baltic Sea ◽  
Water Discharge ◽  
Temporal Trends ◽  
Agricultural Runoff ◽  
Trend Test ◽  
The Baltic Sea ◽  
Nitrogen And Phosphorus ◽  
Study Sites ◽  
The Baltic ◽  
Statistical Trends

Abstract The Baltic Sea is the youngest sea on our planet, the environment of the sea is considered to be unique and fragile. It is affected by various human activities resulting in the impairment of water quality. Riverine nutrient (nitrogen and phosphorus) loads are among the major causes of eutrophication of the Baltic Sea. This study examines temporal trends in water discharge, total phosphorus (TP) and orthophosphate-phosphorus (PO4-P) concentrations and losses from three agricultural runoff monitoring sites in Latvia including Berze, Mellupite, and Vienziemite. The annual datasets of TP and PO4-P concentrations and losses were tested for statistical trends using a nonparametric test - the Mann-Kendall trend test. The timeframe of this study was from 1995 until 2018. The results show a large variety of annual mean concentrations and losses of TP and PO4-P in the study period. No statistically significant trend was detected for TP losses. Meanwhile, statistically significant downward trends were observed for TP concentrations in four out of six study sites and in two study sites for PO4-P concentrations.

scholarly journals ON THE GROUND-WATER DISCHARGE TO THE BALTIC SEA AND METHODS FOR ESTIMATING IT

1973 ◽  
Vol 4 (2) ◽  
pp. 105-118 ◽  
Author(s):  
I. S. ZEKTZER
Keyword(s):  
Water Balance ◽  
Baltic Sea ◽  
Ground Water ◽  
Quantitative Estimation ◽  
Water Discharge ◽  
The Baltic Sea ◽  
Hydrodynamic Method ◽  
The Baltic

The methods for quantitatively estimating ground-water discharge to the Baltic Sea and the possibilities of applying these methods to investigations of the role of ground water in the water and salt balances of the Baltic Sea are discussed. The combined hydrological and hydrogeological method, the hydrodynamic method, and the method of the average long-term water balance of recharge areas are recommended for general quantitative estimation of ground-water discharge to the sea. Data on the ground-water discharge to the Baltic Sea from the zone of intensive circulation (relatively shallow aquifers) within the U.S.S.R. are presented. Certain conclusions are drawn, and objectives of future investigations are mentioned.

THE ROLE OF TOXICOSIS IN THE ADAPTION OF ECOSYSTEMS FOR ANTHROPOGENIC POLLUTION OF THE ENVIRONMENT (AT THE EXAM-PLE OF TOXICOSIS OF WATER ANI-MALS)

2020 ◽  
Vol 2 ◽  
pp. 78-83
Author(s):  
A.V. Makrushin ◽  
◽  
A. S. Vasiliev ◽  
N. M. Arshanitsa ◽  
O. A. Lyashenko ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Fish Larvae ◽  
Age Groups ◽  
Komi Republic ◽  
Lake Ladoga ◽  
Leningrad Region ◽  
The Baltic Sea ◽  
Volga River ◽  
The Baltic ◽  
The Impact

In the past geological eras in the bio-sphere, species extinction was accompanied by speciation. Ecosystems adapted to a greater or lesser extent to coexist with a species whose activity had become a plane-tary factor and had a global impact on bio-spheric processes. One of it is the massive pollution of the main components of the biosphere - geobiosphere, hydrobooster and air. Its consequence is the development in living organisms of various pathological processes associated with the impact of tox-icants-toxicoses. The work was carried out in various re-gions of the USSR and Russia on reservoirs of various types and different objects of aquaculture. Various species and age groups of fish were studied. They were caught with trawls, nets, lifts, and sport fishing gear. Fish larvae were caught with a plankton net. A pathoanatomic method was used to assess the condition of fish. In some cases, histo-logical methods were used. Clams of the family Unionidae were surveyed in 1990-2011. They were collected by dredging in the reservoirs of the Volga, in the lake Ilmen, in the red sea of the Ka-relian isthmus of the Leningrad region and in the Gulf of Finland of the Baltic sea. The liver of 399 individuals was examined us-ing histological methods. Also Perlovitz. Unio pictorum, 474 copies of U. tumidus and 298 copies. the mussels Anodonta sp. Branched crustaceans were examined in 1989-2016. They were collected in a plank-ton grid in the reservoirs of the Volga, in the Nyvchimsky reservoir (the basin of the Volga river). Vychegda Komi Republic, in the Finnish and Kursk bays of the Baltic sea, in lake Ladoga, in the lake of Sevan (Armenia) and in lakes of the Karelian isth-mus of Leningrad region, in the mountain lakes of West Sayan (Krasnoyarsk region), the lakes in Darwin reserve (Vologda re-gion) and in the pools of Garbacki lakes Bolshezemelskaya tundra (Vorkuta district, Komi Republic). Fixation in 4% formalin by Rachkov method was examined in Bo-gorov's cell under the MBS-9 microscope.

scholarly journals Species richness and functional attributes of fish assemblages across a large-scale salinity gradient in shallow coastal areas

2021 ◽  
Author(s):  
Birgit Koehler ◽  
Mårten Erlandsson ◽  
Martin Karlsson ◽  
Lena Bergström
Keyword(s):  
Species Richness ◽  
Baltic Sea ◽  
Fish Species ◽  
Large Scale ◽  
Salinity Gradient ◽  
Coastal Areas ◽  
The Baltic Sea ◽  
Salinity Regime ◽  
Functional Attributes ◽  
The Baltic

Abstract. Coastal ecosystems are biologically productive and their diversity underlies various ecosystem services to humans. However, large-scale species richness (SR) and its regulating factors remain uncertain for many organism groups, owing not least to the fact that observed SR (SRobs) is strongly dependent on sample size and inventory completeness (IC). We estimated changes in SR across a natural geographical gradient using statistical rarefaction and extrapolation methods, based on a large fish species incidence dataset compiled from Swedish fish survey databases. The data covered nearly five decades (1975–2020), a 1,300 km north-south distance and a 10-fold salinity gradient along sub-basins of the Baltic Sea plus Skagerrak. Focusing on shallow coastal and offshore areas (< 30 m depth), we calculated standardized SR (SRstd) and estimated SR (SRest), and related these to sub-basin annual mean salinity and water temperature. IC was high, 98.5 %–99.9 %, in the 10 sub-basins with sufficient data for analysis. The recorded fish species were of 75 % marine and 25 % freshwater origin. Total fish SRobs was 144 for shallow coastal areas, and 110 for shallow offshore areas. Sub-basin specific SRest for coastal areas varied between 35 ± 7 (SE) and 109 ± 6 fish species, and was ca. three times higher in the most saline (salinity 29-32) compared to the least saline sub-basins (salinity 2.7). Completing information on functional attributes showed that differences along the salinity gradient reflected an increased share of coastal resident fish species in lower salinities, and a higher share of migratory fish at higher salinities. The proportion of benthic and demersal fish species was also lower in the least saline sub-basins, and increased with increasing salinity. If climate change lowers the salinity regime of the Baltic Sea in the future this may hence influence the SR and community composition of fish.

Environmental impacts of grey water discharge from ships in the Baltic Sea

2020 ◽  
Vol 152 ◽  
pp. 110891 ◽  
Author(s):  
Erik Ytreberg ◽  
Martin Eriksson ◽  
Ilja Maljutenko ◽  
Jukka-Pekka Jalkanen ◽  
Lasse Johansson ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Environmental Impacts ◽  
Water Discharge ◽  
The Baltic Sea ◽  
Grey Water ◽  
The Baltic

scholarly journals Brown bullhead Ameiurus nebulosus — new fish species for Russia

2020 ◽  
Vol 65 (3) ◽  
Author(s):  
Igor Popov ◽  
Anna Kotova
Keyword(s):  
Baltic Sea ◽  
Lake Ladoga ◽  
Karelian Isthmus ◽  
The Baltic Sea ◽  
Brown Bullhead ◽  
Natural Processes ◽  
Ameiurus Nebulosus ◽  
The Baltic ◽  
Baltic Sea Basin ◽  
The City

The native habitat of the brown bullhead Ameiurus nebulosus is located in the eastern part of North America. This species was introduced in Europe, Southwestern Asia and New Zealand. It was supposed that it entered Russia from the southwest and now inhabits some water bodies at the border with Ukraine and Belarus. Information about bullheads in Russia was searched for in scientific editions and angler’s blogs. Anglers’ reports have been verified by survey and fishing. It turned out that brown bullheads did in fact appear in Russia, but not where they were expected: they were found by the city of Saint Petersburg on the Karelian Isthmus, i.e., on the territory between Lake Ladoga and the Gulf of Finland of the Baltic Sea. They inhabit at least three lakes. This invasion resulted from release by unauthorized individuals. The revealed habitats are linked by brooks with the river systems of the Baltic Sea Basin. The following spread of the brown bullhead is possible due to intentional releases and natural processes.

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