Sandimirov S.S. Catalogue of lakes in the Russian, Finnish and Norwegian Border Area. Finland, Jyvaskyla: Kopijyva Oy, 2008.

Fig. TO. Vertical distribution of the concentrations of Ni, Cu, Cd and Hg (цд/д, dry weight) in the sediment core of Lake Sarijarvi. 1.13.3. Hydrobiological studies No direct hydrobiological investigations have been carried out in this lake. According to earlier studies (Yakovlev et al., 1991), the lakes near the Pechenganikel smelter have low biodiversity levels. The dominant species are chironomids, water-bugs and beetles. The electrofishing surveys in 2004 and 2005 showed that burbot (Lota lota ) was the most frequently caught species in some lakes near the towns of Nikel and Zapolyarny (Lappalainen et al., 2007). 1.14. LAKE TRIFONAJARVI Lake Trifonajarvi (watershed of the Barents Sea) is located 2 km to the west of the settlement of Liinakhamari and 7 km to the north of the settlement of Pechenga. The road to Liinakhamary passes along the side of the lake. It is a small (area of the lake 5.08 km2), relatively deep-water (maximum depth 11m) oval lake of glacial origin and with abrupt shores. The maximum length is 3.8 km and maximum width 2.0 km. The point of maximum depth is located in the central part of the lake. The River Tri- fonajoki flows out of the lake. According to the landscape type, the watershed area belongs to the forest-tun- dra zone with heights of up to 253.4 m (Tyuristunturi fell). The lake shores are high and rocky, and in some parts cov­ ered with shrubs and birch stands. The water of the lake is colourless. Boulder beds occur in almost all parts of the littoral zone. The gaps between the boulders are filled with pebbles. 1.14.1. Hydrochemistry The close proximity of the sea and presence of naval bases substantially influences the water quality of the lake. The water is neutral and has low total mineralization (mean 33.3 mg/l) and alkalinity (mean 93 |_ieq/l). During flood periods the pH of the water Physico-geographical properties Watershed Pechenga Bay— Barents Sea Latitude 69°37.852' Longitude ЗГ15.941' Height above sea level, m 13.2 Maximum length, km 3.8 Maximum width, km 2.0 Maximum depth, m 11 Area, m2 5.08 Watershed area, km2 27.0 Study period 1991-2004 Catalogue ofLakes in the Russian, Finnish and Norwegian BorderArea 43