Table 5. Percent organic matter In the aedlments at Mllleto 

 stations sampled from September 19B0 - June 1983. 



Giants Neck 



September 2.47 



December 2.27 



March 2.10 



June 2.85 



Jordan Cove 



September 1.01 



December 0.85 



March 0.95 



June 1.27 



Intake 



September 0.70 



0.74 

 0.65 



June 

 Effluent 



September 1.44 



December 1.43 



March 1.27 



June 2.07 



General Community Composition 



During 1983, sampling of the subtidal benthic communities yielded a 

 total of 188 species and 31,183 individuals (Table 6). In terms of species 

 numbers, polychaetes and arthropods dominated all subtidal communities 

 accounting for 76.7% to 81.7% of the total species collected. Mollusc 

 species contributed 12-18% of the species. In terms of individuals, 

 polychaetes and oligochaetes, accounted for most of the organisms, with 

 polychaetes most abundant at GN, JC, and IN and oligochaetes at EF. 

 Arthropods were numerically abundant at IN, where they accounted for 33% of 

 the individuals. Molluscs contributed less than 3% of the individuals at 

 all stations. 



The general composition of subtidal communities in 1983 was similar to 

 that observed over the last three years, although some values for 

 percent of species and individuals were outside of the previous three year 

 range, most differences were less than 5%. Only the percent of polychaetes 

 individuals at EF and IN decreased by more than 5% relative to the three 

 year mean (6.1 and 7.5%, respectively). At both stations, an increase in 

 the percentage of oligochaetes was primarily responsible for the observed 

 decrease in the percentage of polychaetes. 



27 



