Table 9. Species diversity (H'), evenness (J), and number of species (S) 

 for each Millstone subtldal station sampled from September 1980 



- June 1983. 



1983 Annual Mean 1980-82 Range of 

 and Standard Deviation" Annual Means 



H' 4.59 t 0.23 2.90 - 4.46 



J 0.73 * O.OI 0.47 - 0.72 



S 80 ♦ U 76 - 80 



r.lants Neck 



H' 3.37 t 0.18 3.42 - 3.86 



J 0.58 » 0.02 0.54 - 0.61 



S 59 i 13 66-90 



Intake 



H' 3.53 1 0.31 3.79 - 4.06 



J 0.66 1 0.05 0.71 - 0.72 



S 41 f 9 43-54 



Jordan Cove 



H' 3.01 * 0.32 3.11 - 3.63 



J 0.51 t 0.03 0.54 - 0.58 



S 61 ♦ 14 55 - 89 



Standard Deviation calculated using quarterly collections in September, 

 December, March and June. 



Stations in 1983 were outside the range of values obtained in the past, the 

 changes were not of the magnitude believed indicative of major shifts in 

 the composition of subtidal communities. 



Cumulative Species Curves 



Cumulative species curves for subtidal stations sampled in each of the 

 last four years are presented in Figure 14. The total number of species 

 comprising all subtidal communities in 1983 was the lowest total observed 

 in the last four years. Cumulative totals at GN and IN were consistently 

 lower in 1983 sampling quarters than those obtained since 1980; at EF and 

 JC , three of the four 1983 values were lower. Curves for all stations were 

 sloped indicating the addition of species throughout the sampling year. 

 The steepest slope, and thus the greatest seasonal species addition, 

 occurred at EF where the annual number of species was nearly double that of 



A5 



