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50% of all samples from Stations A, C, D and G. These four stations, 

 forming an arc around thd northern and western periphery of the Cove, 

 are characterized by a coarser grained sediment than the deeper areas of 

 the Cove and, hence, support a different fauna. Nereis was present in 

 at least 25% of the samples at nearly all other stations, including 

 those immediately adjacent to the generating station. Nereis was numeri- 

 cally abundant through all sampling months and years (Figure 6-4) . 



The spatial distribution of Streblospio benedicti , an oppor- 

 tunistic polychaete found in many polluted estuarine environments, was 

 similar to that of Nereis (Figure 6-2) . Like Nereis, Streblospio was 

 present in greater than 25% of the samples from nearly all stations. 

 Although occasionally reaching high densities in the inner harbor, 

 Streblospio did not occur at inner harbor stations in the frequencies 

 exhibited by Nereis. Except for Station 8, it never was present in more 

 than 50% of the samples from this area. Streblospio occurred most 

 frequently in Morris Cove, particularly at the shallower, coarser- 

 grained stations where Nereis was also most abundant. Streblospio was 

 niomerically important in all study years and seasons (Figure 6-4) . 



Among those species that were present in frequencies greater 

 than 25% at several stations, Nephtys incisa exhibited the most discrete 

 spatial distribution (Figure 6-2) . Nephtys was characteristic only of 

 the deeper areas of the inner harbor, at Stations 8 and 8N, but was 

 present in greatest frequency in the deeper areas of Morris Cove, at all 

 stations except A, C, D and G. This Morris Cove pattern is the opposite 

 of that described above for Nereis and Streblospio. Nephtys was found 

 in low average densities over all seasons through the years of the study 

 (Figure 6-4) . 



Glycera americana was found at only three inner harbor sta- 

 tions, 4a, 8 and 9, in greater than 25% of all samples (Figure 6-2) . In 

 Morris Cove Glycera exhibited a distributional pattern similar to 

 Streblospio and Nereis, reaching greatest frequencies of occurrence at 



(Text continued on page 6-25) 



