Figure 2. Temporal dynamics of the numbers of simultaneously spawning males and females of the sea urchins during mass spawning.

(A) Strongylocentrotus intermedius. (B) Mesocentrotus nudus. All data on the numbers of males and females participating in mass spawning events were combined into corresponding pools and aligned on the X-axis at the time point coinciding with the start of the first spawning in each mass spawning event (denoted by a vertical dotted line). Blue and red lines indicate the numbers of males and females, respectively.