Fig. 3. A representation of the mechanisms
discussed in the text that affect soil
and insect diversity via plant diversity, and
which contribute to feedbacks on diversity
between the two sets of organisms. Direct
mechanisms are represented by solid lines
and indirect mechanisms are represented
by dashed lines. The mechanisms that
maintain soil and plant diversity, and plant
and insect diversity are found in Figs 1
and 2 and are represented as such in this
figure (to avoid complication).