Results of tests of seawater controls and Central Long Island Sound control sediments are followed by 

 the results of the tests from each study site (Table 8). Data from test samples are listed as percent of 

 controls for both end-points. Stations and sites that were significantly different from the respective 

 CLIS controls (t-tests, alpha = 0.05) are indicated with asterisks and those that, additionally, were 80% 

 or less than the control response are listed with two asterisks. Tests were performed in a series of seven 

 batches of samples. Several unavoidable problems were encountered after the samples were collected, 

 necessitating the storage of the samples for 93 to 175 days before the tests were initiated, well beyond 

 the normal allowable storage time of 14 days. The long holding times may have caused some changes 

 in the toxicity of the samples, but do not, alone, invalidate the results. 



As observed in the amphipod percent survival data, survival of bivalve larvae was >80% of controls in 

 the majority of the stations. Percent survival relative to controls ranged from 17.6% in sediments from 

 station 39-B to >100% in many samples. Several samples caused 20-30% survival. In 29 of the sites 

 the results from all samples that were tested indicated agreement as to toxic or nontoxic conditions 

 within the site. In some samples (e.g., station 18-A) variability was very high among the laboratory 

 replicates, and as a consequence, no statistically significant difference was observed from controls. 

 Also, in a few cases variance among stations was relatively small, and despite relatively high mean 

 percent survival, there was a significant difference from the control. Station means that were 80% of 

 controls or less were frequently (21 of 29 samples, 72.4%) significantly different from controls. 



Percent larvae survival was significantly lower than controls in sediments from 23 of 109 stations 

 (21%) and 7 of 39 sites (18%) (Table 8). Percent survival was significantly lower than controls, and in 

 addition, less than 80% of controls in 21 stations and 4 sites. Based upon this test, toxicity was highest 

 in sediments from site 6 (western Long Island Sound), site 7 (upper East River), site 1 1 (lower East 

 River), site 17 (mouth of Newark Bay), site 20 (lower Raritan River), site 30 (Sandy Hook Bay), and 

 site 37 (mouth of the estuary). At least one of the stations and the site mean were significantly different 

 from controls at these sites. Toxicity generally was lowest in sediments from the lower Hudson River, 

 western Long Island Sound, lower New York Harbor, and much of Raritan Bay. 



Percent normal embryo development ranged from 0.0% in samples from Site 30 to >100% in numer- 

 ous samples (Table 8). Between 90% to 100% normal development occurred in 47 of the samples. 

 Percent normal development was significantly lower than controls in sediments from 21 of 109 sta- 

 tions (19%) and 6 of 39 sites (15%). Also, percent normal development was significantly lower than 

 controls, and additionally, less than 80% of controls in 19 of the samples and 4 of the sites. Based upon 

 this test end-point, toxicity was highest in sediments from sites 5 and 6 (western Long Island Sound), 

 site 7 (upper East River), and 30 (Sandy Hook Bay). At least one of the stations and the site mean were 

 significantly different from controls at these sites. Toxicity generally was lowest in sediments from the 

 lower Hudson River, upper and lower New York Harbor, and much of Raritan Bay. 



Both end-points of this test indicated that sediments from sites 6, 7 and 30 were significantly toxic 

 (Table 8). Based upon the t-tests, the data from the two tests indicated 95 of the same stations were 

 either nontoxic or toxic. Also, based upon the results of the t-tests, the two end-points indicated agree- 

 ment on the presence and absence of toxicity in 30 of 39 sites. At 32 of the 39 sites both survival and 

 normal development were either greater than 80% or both were less than 80% of controls. Sediments 

 from some stations (e.g., 7-A, 7-B, 34-B, 39-B) were highly toxic to both end-points. 



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