Fig 5. Drosophila increase activity in the presence of pantropical jumping spiders and moving mock spiders.

The changes in activity of the fly (cm/sec) and the probability for continued forward motion (P++) as a function of the minimum number of visits to each discrete section of the arena boundary (coverage) is shown. Both activity and P++ decrease as the fly habituates to the novel arena boundary [22, 23]. (a) In the presence of the pantropical jumping spider, Canton-S males significantly increase their activity during the early exploration of the arena, coverage 1–2. (b) Canton-S flies do not alter their P++ in the presence of the pantropical jumping spider. (c) The activity or (d) the P++ of Canton-S flies in the presences or absence of a mock spider were not significantly different. (e) Canton-S males display significantly greater activity in the presence of a moving mock spider as compare to an immobile mock spider. (f) The moving mock spider does not significantly change the P++ of Canton-S flies compared to the still mock spider. Shown are the mean +/- standard error of the mean for each data point. The lines show the regressions fit to y = a * (1 + x/b)^c for each experimental group.