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Figure 4


Fig. 4. Effect of Ca2+ on trajectories and swimming speed. Trajectories in the presence or absence of Ca2+ are shown. Sperm trajectories of Acropora digitifera in Na-free ASW containing (A) 5 mmol l-1 EGTA and 10 µmol l-1 of the Ca2+ ionophore A23187, (B) 10 mmol l-1 CaCl2 and 10 µmol l-1 A23187, and (C) 10 mmol l-1 CaCl2. (D) Swimming speed in each of the solutions. Other species showed similar patterns (data not shown). Values are mean ± s.d. (N=150 sperm from five individuals). Scale bars, 50 µm.





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