Figure 1.

Changes over the course of the eight week experiment period in (a) the mean (±s.e.) volume of fungus garden, (b) the amount of leaf material harvested since the previous record, (c) the number of foragers in the food pot, and (d) the average size (head width) of the foragers for colonies from which LW were removed (filled circles and lines) and colonies where both LW and SW were removed (open circles and dashed lines). In (b), error bars have been removed from below the latter colonies and above the former for clarity.