Republic of Karelia on European map

1. Republic of Karelia on European map Lakepromo –Tools for water management and restoration processes

2. Water bodiesof Karelia(Lakes and riverscovers about 21 %of the territory.About 61000 lakesand 30000 rivers, including the Largest EuropeanLakes - Ladoga and Onego) Pryazha

3. NWPI in the LakePromo project Pilot object -Lake Prayzhinskoe

4. Some parameters of Lake Prayzhiskoe Watershed territory56.2 km2 Total lake area 3,6 km2 Length4,5 km Width (max)1,6 km Width (middle)0,8 km Depth (max)7,5 m Depth (middle)4,1 m Water volume 14,9 millions m3 Water retention time 1,2 y Annual water level fluctuations 0,6 m Melioration area 200 ha

5. Hydrochemical paramerters September 2005 (some average data on stations and horizons) Na – 2,3 mg/l K - 0,93 mg/l Ca – 3,55 mg/l Mg – 1,53 mg/l Cl – 1,73 mg/l SO4 – 2,11 mg/l BOC5 – 1, 48 mgО2/l NH4 – 8 mkgN/l NO2 – 0 mkgN/l Fe – 0,78 mg/l Si – 0,32 mg/l pH – 7,1 – 7,2 Oxygen content - 10, 2 mgl (89-93%)

6. Hydrological investigations water level fluctuations 1964-1980

7. The ecological problems • The uncomfortable accommodation mostly without canalization system of about 5000 people) • The increase number of summer cottages and small enterprises • The income of the polluted waters with nutrients high content from the houses and private agricultural farms. • Several agriculture farms situated near the lake • The roads communications around the lake • The active use of motor boats • The operation of the sand-gravel open pit on the north-west shore • The amelioration done on the Degers stream upper part (200 ha) • The function of the industrial complex with the waste dump • The new tourist complex constructed on the bank of the lake

8. Modern stateMonitoring 2005 • According to results of investigations conducted in 2005 and waterbodies classification done in the NWPI Lake Pryazhinskoe is classified as • mezopolyhumic (color – 90 degrees, oxygen consumption – 16 mgО/l, Fe – 0.70 мг/л), • middle alkalinity zirkum-neutral (Alk – 13.0 mgHCO3-/l, рН ~ 7.0, Acid – 1.5 mgСО2/l) • and eutrophic (Рtot – 67 mkg/l, Рmin – 17 mkg/l) waterbody. • The main tributary of the Lake Pryazhinskoe - Degers stream is classified as • polyhumic (color – 240 degrees., oxygen consumption – 45 mgО/l, Fe – 2.7 mg/l), • weakly alkalinity weakly acid (Alk – 8,9 mgHCO3-/l, рН – 6.1, Acid – 11.7 mgСО2/l), • hypertrophic (Рtot – 238 mkg/l, Р min – 158 mkg/l) waterstreams

9. Conclusion on hydrochemical results As compared to the results of the investigations conducted in 1953 and 1987 the content of total posphorus in 2005 increased in 2 times in the lake and in 6 times in the Degers stream. The main reason is the higher level of anthropogenic load on the watershed territory.

10. Toxicological experiments • Introduction: • Tests on water and bottom lake sediments toxicity were done on 5 day old Daphnia magna Straus. The water and bottom sediments samples were taken from 4 stations. The experiments were conducted during 4 days. • Results: • the water is not toxic - survival rate was 100 % in all tests • the bottom sediments from station 3 were toxic - survival rate was only 60 % • Conclusion: • the anthropogenic load to Lake Pryazhiskoe was significant for some years and different toxic components were accumulated in the bottom sediments • the additional more detail experiments on all water body is needed

11. Hydrobiological investigations The first results of the hydrobiological investigations on Lake Pryazhinskoe were published in 1959 «Lakes of Karelia». The more detail information on phyto- and zooplankton and macrozoobenthos was got in 1992-1994 in the frame of the program “Ecological monitoring of Karelia” and published in 1998. In summer period of 90-th the dominant species was cyanobacteria Anabaena Lemmermannii - 70% on the number parameter and 40% on total phytoplankton biomass By the earlier results on the zooplankton number the conclusion was done that the trophic level of the lake increased and had of ο- β- mesosaprobic character. The main species was Cladocera. In macrozoobenthos the dominate species were Chironomus plumosus, Pagastiella orophila, Procladius by number (68%) and biomass (91%). The total biomass in 1994 was 1554 sp/m2 and biomass 3,74 g/m2.

12. The previous hydrobiological results confirm the process of further eutrofication taking place in Lake Pryazinskoe mostly due to anthropogenic load In 2005 the new hydrobiological investigations were conducted for water quality changes assessment on the bases of the biological parameters: taxonomic content, the structure of biota communities, quantity parameters. It was taken 4 samples of phytoplankton on the upper water horizon and 12 samples of macrozoobenthos on the 4 complex stations on the depth from 2.5 up to 7.5 m.

13. Bottom sediments The map of Lake Pryazhinskoe bottom sediments М 1: 25.000 Sand – 25% Silt – 75% Mineral – some places on the east part x x x x x The first bottom sediments investigations and the map were done in 1953. In 2005 were taken 6 samples which are under the investigation now.

14. Some conclusions • The higher anthropogenic load on the Lake Pryazhinskoe watershed territory and directly to the lake • The rather low water quality (3-th class) • The natural eutrophic status of the lake which permanently increase due to human activities • Water quality doesn’t correspond to drinking waters standards • The future plans for active lake use for tourism and recreation

15. Ground waters investigations on the Lake Pryazhinskoe watershed territory

16. The ground water intake wells

17. Main goal for Lake Pryazhinskoe restoration The Lake Pryazhinskoe has a great importance as the source for public and food industry water supply and the place for recreation

18. Measures for improving of the situation and restoration ofLake Pryazhinskoe • The decrease of nutrients load on the watershed and shore zones • The application of Lakepromo project experience for lake restoration • The wide environmental education for the district population

19. Ecological education of stakeholders • The LakePromo info brochure was prepared on Russian and delivered to local administration • The seminar on Lake promo pilot-object Lake Pryazhinskoe was held in 20.10 in Praza together with local administration and population • The ecological problems and now days situation of Lake Pryazinskoe watershed territory were disused • The LakePromo project information and possible suggestions on anthropogenic load decrease is actual and required

20. Thank you! • Welcome to Karelia in 2006 !