Table 18-2. Mean linear velocites (MLV) of various hatches of 

 stage II Balanus amphitrite nauplii at 20°C. 



Hatch 

 No. 



N 



MDP 

 (sec) 



MLV±sd 

 (mm/sec) 



3 



8 



9 



14 



24 



25 



40 

 57 

 14 

 24 

 23 

 20 



7.0 

 5.3 

 6.1 

 9.0 

 7.4 

 7.0 



0.7510.34 

 0.72 ±0.20 

 0.65 ± 0.43 

 0.71 ±0.23 

 0.72 ±0.27 

 0.85 ± 0.33 



NOTE: N 



analyzed. 



30 



20- 



10 ■• 



20- 



10- 



number of paths analyzed, MDP = mean duration of paths 



— I — I — ' — I — I — I — I — p — I — 1 



30 



20 

 10 ■ 





 30 



20 -■ 



10 .. 





 30 



20 - 



10 



I I 1 I I 



I 2 



MM/SEC 



Figure 18-4. Examples of mean linear velocity (mm/sec) dis- 

 tribution \Anthin five test groups of stage II barnacle nauplii: 



NOTE: A) Balanus improvisus from Rhode Island at 20°C, B) Chthamalus 

 fragilis at 20°C, C) Balanus amphitrite control, D) B. amphitrite with 24 hr. 

 exposure to 20 ppb Cu, E) B. amphitrite with 24 hr. exposure to 350 ppb Cu. 



279 



