Causes of Technogenic Changes in a Freshwater Zooplanktonic Community

The pelagic food web in forest lakes affected by alkaline mining waste in NW Russia

“…The results obtained by Kalinkina et al (2003) agree well with those given in Vlasova (1998) and show biomass values between 80 and 800 mg ww m -3 for zooplankton in Lake Poppalijärvi in July-August 1992 to 1997, but only 12−15 mg ww m -3 in 1999 to 2001. Our results for the pelagic surface water (0−5 m) show that the zooplankton biomasses are highest in Lake Kento and Lake Upper Kuito (up to 850 mg ww m -3 ; fresh mass is carbon mass × 18.093, Karjalainen et al, 1996).…”

“…The unnaturally high absolute and distorted relative ion concentrations (Kalinkina et al, 2003) observed since 1994 are expected to affect organisms at different levels because many cations interact with biological membranes and regulate their permeability and ion transport. Although the heavy metal contents of the wastewaters are elevated, their concentrations in the lakes downstream from the mine and their bioavailability for biota are low at the ambient high pH and water hardness (Tkatcheva et al, 2004).…”

“…In 1994 Chrysophyceae were well represented in all lakes, even upstream from Lake Poppalijärvi (Chekryzheva, 1995). According to Kalinkina et al (2003), potassium increased in Lake Poppalijärvi from 10.6 mg L -1 in 1993 to 42.4 mg L -1 in 1994 and to 60 mg L -1 in 1995, accompanied by some increase in Ca 2+ and Mg 2+ .…”

“…Data on water quality and biota in this water course have been given e.g. in Virtanen & Markkanen (2000), Lozovik et al (2001), and Kalinkina et al (2003). Preliminary results on the food web are given e.g.…”

Specific features of the numbers and structure of the population of Proteocephalus longicollis (Zeder 1800) (Cestoda: Proteocephalidea)—A mass parasite of whitefish Coregonus lavaretus L. under conditions of technogenic pollution of the water body

“…Large concentrations of alkaline metals and hydrocar bonates in water determined a shift in pH to the alka line area (Modern state …, 1998; Lozovik et al, 2001). A high water concentration led to the extinction of many species of hydrobionts adapted to weakly miner alized waters of northern lakes (Kalinkina et al, 2003). Zooplankton of the Kostomuksha tailing dump is very poor in the qualitative respect and is represented by typical northern eurytopic species.…”