where the mussels have been maintained. The ratios of immature 

 and mature individuals derived from histological examinations of 

 the four populations were further analyzed by a replicated 

 goodness of fit test (Sokal and Rohlf, 1969) in which the total G 

 is partitioned to yield additional information. 



Results 



Trace Metal Concentrations . The mean tissue concentrations 

 of nine- trace metals found in the mussel populations maintained 

 at Ram Island reference station (Rlr) , Western Long Island Sound 

 reference station (WLISrN) , Western Long Island Sound disposal 

 site center (WLISc) and 500 meters west of the disposal site 

 (500MW) from June 1984 to June 1985 are presented with the 

 results of two-way ANOVA and Tukey's test in Table 3. In 

 addition, tissue trace metal data organized on a temporal basis 

 and expressed in terms of both lg per g of wet and freeze-dried 

 weight by station are included in the Appendix (Table la,b to 

 4a, b). 



Trace metal concentrations exhibiting statistically 

 significant differences were revealed by the two-way ANOVA ( p < 

 0.05) (Table 3). The analyses indicate that the concentration of 

 Cd, Cu and Zn show highly significant between-station 

 differences. However, as revealed by the Tukey's Test, such 

 differences occur only between the mussel populations maintained 

 at Rlr and the other three stations which manifested a general 

 uniformity in the three trace metal concentrations (Table 3A) . 

 Therefore, the observed significant between-station differences 

 were attributable solely to the Rlr population which exhibited 

 the lowest concentration of most trace metals examined (Figs. 5, 

 6 and 7) . Because the original mussel populations deployed at 

 the WLISc, 500MW, and WLISrN were supplemented with LATr mussels 

 in March 1985 and sampled concurrently with the remaining 

 original mussels, trace metal data for the newly imported mussels 

 obtained during April, May and June 1985 were grouped separately 

 and subjected to one-way ANOVA. The results shown in Table 4 are 

 remarkably similar to those presented in Table 3 ; the same three 

 trace metals, Cd, Cu and Zn, showed significant between-station 

 differences. The results, therefore, indicate that the disposal 

 of dredged materials did not induce a significant localized 

 increase in the trace metal concentrations at any of the 

 experimental stations. 



Temporal differences (before-during disposal differences) in 

 tissue cobalt, copper and iron concentrations were observed in 

 mussel populations deployed at WLISc, 500MW, and WLISrN (Table 

 3B, Fig. 6) . In all cases before disposal, the three tissue 

 trace metal concentrations were significantly lower than the 

 during disposal trace metal concentrations. Unfortunately, the 

 project was terminated in June 1985 before disposal was 



