Intraspecific divergence in sperm morphology of the green sea urchin, Strongylocentrotus droebachiensis: implications for selection in broadcast spawners.

Variation among males We found highly significant variation among individuals within all three populations for all sperm traits (Table 1 ; head length shown in Figure 1B ) with the exception of midpiece area in the East Atlantic population ( F 5,130 = 0.76, P = 0.58).

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