Twenty-four core samples containing the top 11 centimeters of sediment 

 were collected at each station, giving a total area sampled at each 

 station of 0.118 square meter. The adequacy of the sample size was 

 indicated by plotting a cumulative species curve for cores from one 

 control and one borrow station during the initial sampling period 

 (Fig. 4). The curves tend to level off after about 21 cores, indi- 

 cating that most of the common species were sampled. 



8 10 12 14 16 

 NO. OF CORE SAMPLES 



18 20 22 24 



Figure 4. Cumulative number of species collected versus increased 

 number of samples for stations 2 and 4. 



13 



