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Selected Publication:

Type of publication: Diploma Thesis
Type of document:

Year: 2014

Authors: Kohl, Astrid

Title: Zum Zusammenhang zwischen der Aktivität von Ixodes ricinus (Gemeiner Holzbock) und Klimadaten.

Other title: On the relationship between Ixodes ricinus activity and climate data

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 55.


Brugger Katharina
Rubel Franz

Joachim Anja

Vetmed Research Units:
Institute of Food Safety, Food Technology and Veterinary Public Health, Unit of Veterinary Public Health and Epidemiology

Graduation date: 09.07.14

Tick-borne infectious diseases are increasingly important subjects of veterinary public health. The aim of this study was to analyse the correlations between the seeking activity of I. ricinus and climate parameters, to develop an early warning system for ticks in the future. Therefore the German company tick-radar GmbH provided data on tick activity. I. ricinus ticks were exposed in field plots at four locations in Germany (Berlin, Bielefeld, Gießen and Regensburg) and their activity was observed for multi annual periods. In this thesis these activity values were correlated with local climate parameters. Ticks show a typical seasonal pattern of activity, whose shape is similar at all age groups and locations. The activity is determined, for example, by temperature: Ticks have a comfortable temperature (about 5 to 25° C), above or below they are usually not active. They are also not active when the environment is too dry, such as during drought. Furthermore, this work shows that I. ricinus does not stop its activity in mild winters, resulting in a tick biting risk during the entire year. The mean correlation across all tick groups and locations taken for their full observation period depicts maximum correlations between the activity of adult ticks and day length (0.59 ± 0.08), maximum daily temperature (0.32 ± 0.08), daily average temperature (0.31 ± 0.08) and relative humidity (-0.29 ± 0.07). Similar results were calculated for the nymphs: day length (0.56 ± 0.09), maximum daily temperature (0.26 ± 0.08), daily mean temperature (0.26 ± 0.08) and relative humidity (-0.23 ± 0.06). The mean values of the adults and nymphs are quite similar, the confidence intervals are consistently very small.

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