Table 18-1. Mean Linear Velocities (MLV) of Stage II 

 Barnacle Nauplii Exposed to Different Temperatures 



for 24 Hours. 



nauplii from Rhode Island adults exhibited a decreased velocity above 22°C. A 

 comparable reduction in velocity mth Rhode Island nauplii also occurred v^ith 

 Chthamalus fragilis above 20°C. Yet overall, naupliar swimming speeds appear 

 to be greater in the Rhode Island animals when measured within this 

 temperature range. 



Brood Variability 



Linear swimming velocity in nauplii obtained from different broods of 

 South Carolina adults was assessed under similar temperature, salinity, and 

 light regimes to evaluate brood variability. Linear velocities were found to be 

 similar among six broods (Table 1 8-2). Examples of MLV distributions within 

 test groups of B. amphitrite, C. fragilis, and B. improvisus are shown in Figure 

 18-4. Control groups usually have Unear velocity distributions which 

 approximate normal or are skewed to the left. 



278 



