400-1 



GIANTS NECK 



TEREDO NAVALIS 

 NOV. 



300" 



< 



Z) 

 Q 



> 



- 200- 



o 



(/) 



h- 

 ■z. 



o 

 o 



100- 



£-94 



£-30 



1 1 1 



3 4 5 



CUMULATIVE REPLICATES 



Figure 6. 



Cumnulative mean abundance of Teredo navalis (shipwom) over six 

 replicate panels at Giants Neck in November 1980, illustrating the 

 increase in the 95% confidence interval around the mean (variance) 

 due to the vertical displacement of panels (replicates 1-3 on top 

 and 4-6 on bottom of rack). 



17 



