Cover -- Contents -- Introduction -- Acknowledgements -- Chapter 1. The Study Area. Material And Methods -- 1.1. Research Objects And Study Area -- 1.2. Methods -- Chapter 2. Phenotypic Diversity Of Ixodes Populations -- Chapter 3. Anthropogenic Pressure And The Accumulation Of Heavy Metals In The Environment -- 3.1. A Study On Ixodes Tick Environments In A Monitoring Area Near St. Petersburg -- 3.2. Characteristics Of Environmental Pollution By Hm And Oil Products -- 3.3. A Study On Soils -- 3.4. A Study On Snow -- 3.5. A Study On Vegetation -- 3.6. A Study Of The Hm Content In Ticks. Correlation Between Hm Content In Ticks And The Prevalence Of The Anomalous Part Of The Population -- Chapter 4. Ixodid Ticks As Reservoirs And Vectors Of Tick-Borne Disease Agents -- 4.1. Tick-Borne Encephalitis -- 4.2. Bacterial Tick-Borne Pathogens -- Order Spirochetales -- Order Rickettsiales -- Order Mycoplasmatacea -- 4.3. Protozoan Tick-Borne Pathogens -- 4.4. Mixed Tick-Borne Infections -- 4.5. 8220;Vulgar8221; Microflora Of The Internal Environment Of Ticks -- 4.6. Larvae Of Ichneumonids From The Family Encyrtidae (Insecta: Hymenoptera) -- 4.7. Microfilaria From The Genus Dipetalonema (Nematoda: Filarioidea) -- Chapter 5. Compatibility Of Pathogens In The Tick Host -- Chapter 6. Sexual Behaviour Of Ticks And Its Role In Maintaining The Circulation Of Pathogens -- Chapter 7. Locomotor Activity As An Index Of Tick Aggressiveness -- 7.1. A Study On The Individual Activity Of Ticks Regardless Of The Object Of Aggression -- 7.2. A Study Of Tick Behaviour On Attacked Humans -- 7.3. A Study Of The Behaviour Of Infected And Naive Phenotypically Different Ticks At The Population Level -- Chapter 8. The Ecological Background Of An Epidemiological Prognosis In The Study Area -- Chapter 9. Ontogenesis In The Two Phenotypic Groups Comprising Tick Populations -- Chapter 10. The Impact Of Global Warming On The Functioning Of The Parasitic System 8220;Ticks8211;Pathogens8221; -- Chapter 11. Stability Of The Parasitic System And The Possibility Of Vicious Circle Formation Under Anthropogenic Pressure -- 11.1. Conditions Ensuring The Stability Of The Parasitic System As A Parasitocoenosis -- 11.2. A Vicious Circle: Enhancement Of Tick Vectorial Capacity In The Conditions Of An Increasing Environmental Pollution -- Conclusion -- References.