Fig. 5From: Spectrophotometric analysis of lipid used to examine the phenology of the tick Ixodes ricinusThe frequency distribution of observed lipid values (μg), measured by spectrophotometric analysis, in groups of nymphal Ixodes ricinus collected by blanket dragging each month in south-west England, UK, during 2015 in 4 μg classes. For reference, the median lipid value for all the samples collected over the two-year period, 14.9 μg, is indicated by the red linesBack to article page