Figure 5
Month of onset of activity by Ixodes ricinus nymphs in relation to monthly mean daily maximum temperature. Averages for 4–7 tick-monitoring sites in each of Switzerland, Germany, Slovenia, Czechland, Poland, Lithuania, Estonia and Latvia. Temperature recorded at locations near to, or within the geographical limits of, tick sampling sites (see text and Figures 2 and 4 legends). Inactive ticks (open symbols) or active ticks (closed symbols) for 2005 (green square), 2006 (black circle) and 2007 (gold triangle).