Figure 2.

Diagram of sampling schedule (filled rectangles) superimposed on expected abundances of active ticks, Ixodes scapularis), which breeds only at the end of its two-year life cycle. Two overlapping populations are present at any given time and are represented here as different shades. N, L, and A denote periods of nymph, larval, and adult activity. Relative abundances are based on Figure eight in Ostfeld [2].