Figure 5.

Infection level with Acute Bee Paralysis Virus (a), Black Queen Cell Virus (b), Deformed Wing Virus (c) and Sacbrood Bee Virus (d) during the nutritional stress period (squared in grey) and in spring. Colonies from group M (monofloral) are represented in blue and colonies from group P (polyfloral) are represented in orange. Boxes show 1^st and 3^rd interquartile range and median represented by a line. Whiskers include the values of 90% of the samples. Significant differences of pairwise comparisons at each sampling time are represented as * when p ≤ 0.05, ** when p ≤ 0.01, and *** when p ≤ 0.001.