. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 L. G. YOUNG AND L. NELSON 120- 80- o u •3. •4 -5 -6 Log [MnCI2 or CuCI2] added to FSW FIGURE 2. Effects of CuCU and MnCU on the swimming speed of Arbacia pnnctulata spermatozoa. MnCla and CuCl2 added to filtered Woods Hole seawater containing 10' ± 10% Arbacia pnnctulata spermatozoa decreased their swimming speed in proportion to the concen- tration. Abscissa is concentrations of metal ion added, in log moles per liter of seawater/sperm suspensions: copper—open and closed squares, manganese—open and closed circles (open
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 L. G. YOUNG AND L. NELSON 120- 80- o u •3. •4 -5 -6 Log [MnCI2 or CuCI2] added to FSW FIGURE 2. Effects of CuCU and MnCU on the swimming speed of Arbacia pnnctulata spermatozoa. MnCla and CuCl2 added to filtered Woods Hole seawater containing 10' ± 10% Arbacia pnnctulata spermatozoa decreased their swimming speed in proportion to the concen- tration. Abscissa is concentrations of metal ion added, in log moles per liter of seawater/sperm suspensions: copper—open and closed squares, manganese—open and closed circles (open and closed data points from replicate runs). Ordinatc is the swim rate of treated sperm expressed as per cent of control rate in a seawater. Each point represents an individual determination of swim rate expressed as a per cent of control rate in seawater at a temperature of 22-23° C. Note that while the seawater content of Mn2+ and Cu2+ both equal about 10~7 equivalents per liter, the sperm cells are more sensitive to excess copper by about two orders of magnitude. excess copper. Copper appears to exert its effect on sperm motility almost imme- diately after addition to the sperm cell suspensions; further significant declines in swimming speed do not occur after the first 4 minutes centrifugation. Manganese Woods Hole seawater contains approximately the same concentration of manganese as it does copper. But as shown in Figure 2. manganese exerts much less of an inhibitory effect on Arbacia sperm motility than does copper. Addition of , or 5 /nEq manganese/liter to the sperm cell suspensions does not measurably affect the swimming speed. Excess manganese up to 25 juEq/liter causes only a 4 or 15% reduction in motility and further increases result in only a slow decline in Arbacia sperm swimming activity; in the presence of mEq manganese/liter—approximately three orders of magnitude greater than the nor- mal seawater concentrations of this heavy metal ion
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