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
and climate parameters, to develop an early warning system for ticks in the future. Therefore
the German company
provided data on tick activity.
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
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.