Trade-Off between Foraging Activity and Infestation by Nest Parasites in the Primitively Eusocial Bee Halictus scabiosae

Figure 3

Mapping of the nests of Halictus scabiosae at the study site. Left: strip of $5\times 24$ m (see Figure 2) with the four batches of nests (A–D, marked by yellow areas) where the activities of Halictus scabiosae and their parasites were videotaped. The grid indicates $2\hspace{0.17em}\text{m}\times 2\hspace{0.17em}\text{m}$. Right: batches of active nests; the insets show the batches on a smaller scale with the nest entrances shown as black full circles.