Gravid (egg-bearing) females and polychaetes and Crustacea juveniles 

 were identified and recorded when found in the benthic samples. Size 

 measurements and counts were made of males, females, gravid females, and 

 juveniles of several common amphipod species taken at the control stations. 

 Larval settling time and growth rates were observed for a few abundant 

 colonizers at the dredging and disposal sites. 



Most of the bivalves that settled in the jars were too small to be 

 identified to species. Therefore, only the total number of bivalve 

 individuals per exposure interval was presented. Although settling oc- 

 curred sporadically throughout the study period (Fig. 5) , a larger number 

 of individuals settled in the winter and in the spring. Most of the 

 individuals were the juveniles of several species commonly found in fine 

 sediments. A few adult organisms present were too large and deep in the 

 sediment to be adequately sampled. A high mortality was caused by 

 physical events subsequent to larval settling. There was no obvious 

 indication of predation (e.g., shells with boring), although it was a 

 possibility. 



The reproductive activity for many of the common nonmolluskan macro- 

 invertebrates is shov^m in Figure 5. Most of the species of the worm 

 fauna that settled in the jars were polychaetes. The number of species 

 was highest in the spring. The large number of individuals in the fall 

 was primarily due to Cap-itella capitata; in the spring, Armandia 

 hi-oculata and Nephtys coimuta accounted for most of the individuals. 



Armandia bioaulata had two distinct settling periods, the spring and 

 fall (Fig. 6). The worms also occurred in large numbers at the dredged 

 harbor station in late fall 1971, and during March and April 1972 when 

 the jars were first tested. 



Capitella oapitata larva settled in large numbers at disposal and 

 dredged stations in October 1971 and in the jars in October 1972 (Fig. 6). 

 They had also been present in March and April 1972, but none were found at 

 the end of the testing on 1 June 1973. Although settling varied during 

 spring and summer, there was a similarity between the 1971 and 1972 fall 

 peaks . 



Magelona sacculata was the dominant polychaete at the 20-meter control 

 station. It had a definite pelagic larval stage, but did not settle in 

 the jars. Large numbers of juveniles were present in the spring benthic 

 samples (Fig. 7) . Presumably, magelonids prefer a sandier substrate and 

 respond negatively to the fine sediment accumulated in the jars. 



Phoronopsis viridis (phoronid) had many juveniles settle in the jars 

 and at the harbor station during late March, April, and early May 1973 

 (Table 5) . The spring settling seemed distinct, and agreed with the 

 findings of Rattenbury (1953) . 



Reproductive patterns of crustaceans can be determined by examining 

 egg-carrying females and the size classes in populations. The patterns 



