Table 6. Comparison of the step length (cm) of leading and outsider sea urchin males during the prespawning period.

The data are presented as the median and range (in parentheses) for 35-min intervals before the start of spawning. The Mann–Whitney test was used for comparison. “n” is the number of full tracks of sea urchin movement.

Species	Leading males	Outsider males	Statistics
Strongylocentrotus intermedius	0.1 (0–6.4) n = 21	0.14 (0–6.3) n = 29	U = 355145, p = 0.0756
Mesocentrotus nudus	0.1 (0–8.6) n = 33	0.14 (0–8.4) n = 30	U = 583245, p = 0.2407