Fig. 6
From: Spectrophotometric analysis of lipid used to examine the phenology of the tick Ixodes ricinus
The 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 2016 (excluding August 2016) 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 lines