Table 2.

Distribution of body angles from crab paths in different flow and odor conditions

Interval (deg.)
0-15 15-30 30-45 45-60 60-75 75-90
High-velocity tracking 0.04 0.03 0.04 0.16 0.37 0.36
High-velocity non-tracking 0.0 0.0 0.0 0.0 0.24 0.76
Tracking vs non-tracking 0.04 0.03 0.04 0.16 0.14 -0.40
Low velocity tracking 0.10 0.14 0.14 0.15 0.16 0.30
Low velocity non-tracking 0.0 0.0 0.02 0.10 0.29 0.59
Tracking vs non-tracking 0.10 0.14 0.12 0.05 -0.13 -0.29
  • Table gives the proportion of observations that fall into successive 15° intervals, and the difference between the proportions of tracking vs non-tracking animals in each flow velocity. The number of observations equals the number of video frames collected from all paths in a given treatment and totals 941, 1143, 941 and 720 for high-velocity tracking, high-velocity non-tracking, low-velocity tracking and low-velocity non-tracking, respectively.