For the purpose of this evaluation, two of the five stations, 

 Giants Neck and Effluent, have been selected to describe the variability 

 and adequacy of estimates associated with the community and population 

 parameters monitored. Communities at Giants Neck in the last three 

 years have had the greatest number of species collected and have been 

 representative of communities at White Point and Fox Island. Communities 

 at Effluent in the last three years have had the fewest numbers of 

 species collected and have been the least similar to communities of the 

 other four stations. Therefore, these two stations are representative 

 of the range in data which is potentially affected by station location 

 and should bracket the variability and adequacy of estimates associated 

 with the community and population parameters monitored. 



Substrate type . Battelle (1978) concluded that communities collected 

 on asbestos and wood panels were different based on 12 replicates panels 

 exposed at Giants Neck and Fox Island from August 1977 through August 

 1978. Reexamining this difference, we calculated Czekanowski similarity 

 coefficients for 1980 data collected at Giants Neck and Effluent. 

 Dendrograms for these similarity values reconfirmed that communities 

 developing on asbestos and wood panels were distinct (Fig. 4). These 

 differences were maximized in February and November at Giants Neck and 

 in August at Effluent. At Giants Neck, differences between panel types 

 were primarily caused by 6 of 39 taxa collected in February and 9 of 50 

 taxa collected in November (Table 3). At Effluent, these differences 

 were primarily caused by 7 of 16 taxa collected in August. Of the 18 

 species listed in Table 3, eight had significantly different abundances 

 (based on the overlap of the 95% confidence limits) on the two panel 

 types . 



12 



