Fig. 1. Orientation of abalone sperm to individual eggs. Sperm were videotaped for
30 s in the presence of a red abalone egg (A) or brine shrimp egg (B)
(negative control). Polar plots show the vector mean angle of sperm swimming,
relative to the egg surface (0°); the bar represents the vector mean
length (r). On the left, representative swimming paths of individual
sperm are plotted around an abalone or control egg. Circles correspond to
video images captured at 0.033 s intervals, and arrowheads correspond to the
directions of travel for individual cells.
