Tatyana D. Slepukhina

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Using as examples water bodies in different geographical zones (Lake Ladoga, the River Sukhona, shallow-water ponds of the North Caucasus) the known methods of water quality evaluation by means of oligochaetes are considered. There is no unique universal method of pollution bioindication in. this way. In water bodies of all types the mass development of(More)
Lake Ladoga (the largest lake in Europe) was characterized by good water quality some decades ago. Now as a result of human impact, the saprobity and toxicity of water have changed, phytoplankton biomass has increased, and populations of many sensitive species have declined. Morphological deformities of invertebrates are observed in heavily polluted areas(More)
Silty and clayey sediments predominate in the bottom sediments of the deep basin of northern Ladoga. Chemical fractionation of organic constituents of the sediments indicate prevalence of chemically stable fractions in most samples. The sedimentary diatom assemblages contain large numbers of littoral taxa, but more than 90% of the total counts of frustules(More)
Until the early 1960s, Lake Ladoga was oligotrophic and characterized by good water quality, but within the past 20–30 years, as a result of human impact, the ecological state seems to have deteriorated. Especially since the 1970s, its trophic state has changed to mesotrophic, with elevated nutrient concentrations and decreased transparency. Conditions at(More)
The Oligochaeta are more exposed to disturbance under conditions of intense water movement than other invertebrates, particularly when the substrate is unstable. Furthermore, low mobility of bottom water, which can lead to excessive accumulation of organic matter in sediments, and to the formation of ‘sapropel’, can also be limiting to the distribution of(More)
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