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Ticks (Ixodidae) of the lower Dniester river: diversity, phenology, and epizootological importance

Author: Oxana Cravcenco
Degree:doctor of biology
Speciality: 03.00.08 - Zoology
Scientific adviser: Ion Toderaş
doctor habilitat, professor, Institute of Zoology
Institution: Institute of Zoology


The thesis was presented on the 22 November, 2016
Approved by NCAA on the 28 December, 2016


Adobe PDF document1.76 Mb / in romanian
Adobe PDF document1.05 Mb / in russian


CZU 595.421:591.5(478:282.243.14) (043.2)

Adobe PDF document 7.19 Mb / in russian
175 pages


ticks, imago, seasonal dynamics, urban epizootological and epidemiological importance


Structure: introduction, four chapters, the main conclusions and recommendations, bibliography of 228 sources. The work is presented on 120 pages of the main text; it contains 18 tables, and 52 figures. The obtained results were published in 10 scientific papers.

The field of study: zoology.

The goal of the thesis is to study diversity of questing tick species, and their phenology, as well as the potential epizootological and epidemiological importance in foci of the lower Dniester river. Our research objectives are:

1. To identify the modern questing tick species diversity;
2. To ascertain the number of ticks and the composition of species in various habitats;
3. To evaluate the abundance and phenology of ticks;
4. To analyze the potential epidemiological significance of Ixodes ticks in the lower part of Dniester river.

Originality and scientific novelty.

 For the first rime for Republic of Moldova, we have identified the prevalence of human pathogenic Babesia venatorum, an iportant causitive agent of babesiosis in foci of Ixodes ricinus ticks.
 The level of infestation of mites in stationary areas of the Lower Dniester pathogenic to humans Borrelia (Borrelia ixodids average infection was 27,5%, in the grip of dominant B. afzelii - pathogen predominantly cutaneous Ixodes tick borreliosis).
 For the first time, we have compared questing tick species and their phenology for over the past 30 years in the lower Dneister river. Registered 6 species of ticks (Acarina: Ixodidae), belonging to 3 genera, with prevalent are 4 types of ticks.
 The parameters of the stochastic model of the population dynamics of populations of ticks I. ricinus, the stages of ontogeny in favorable and unfavorable abiotic and biotic environments.

Solving the important scientific problem is a scientific substantiation of the role of dominant tick species (Acarina: Ixodidae) in foci of the Lower Dniester river as vectors of various tick-borne pathogens, leading to the determination of their level of infestation, as well as to establishm diversity of tick species. It allows us to determine for the first time in the past 30 years the modern situation on the distribution and phenology of ticks in the Lower Dniester region and contributes to the forecasts of the epidemiological situation for public health centers.

The theoretical significance. The findings expand our knowledge of the fauna, ecology, as well as epizootological, and epidemiological role of questing ticks in foci of the Lower Dniester river.

The practical significance. Materials of the thesis can be used in scientific and practical work by epidemiologists, entomologists, microbiologists, as well as didactic material in zoology and animal ecology. Furtherm these data represent of particular interest for the Public Health Center, as contributing to the forecasts of the epidemiological situation.

Implementation of scientific results. Research results are used in the educational process in the departments of biology and chemistry (Transnistrian State University, Tiraspol and College of Medicine, Bender). Further these data are applied by the competent authorities for forecasts of possible outbreaks and to prepare a strategy to deal with such situations (Republican Center of Hygiene and Epidemiology, Tiraspol).