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Fig. 3. Orientation of the walking track as P. americana males left the
release point to track a pheromone plume in zero wind after being pre-exposed
to (A) wind + pheromone, (B) no wind + no pheromone, (C) wind only and (D)
continuous wind and pheromone from the Series 2 experiments. Controls tracked
plumes while being exposed to wind and pheromone continuously (D). On these
circular plots due upwind=0° and downwind=180°.
, angle of mean
leaving direction; r, length of mean vector. r is
distributed between 0 and 1, with 0 indicating no movement in the mean
direction, and 1 indicating all movements were in the mean direction.