between the number o£ species and individuals was not significant 

 (r = 0.50, 0.1 < p > 0.05). Paraphoxus ddboius was a persistent member 

 o£ the assemblage and the dominant crustacean in every sampling period, 

 but there was a fairly distinct seasonal trend. The numbers of species 

 and individuals decreased toward the winter and increased in the spring. 

 Paraphoxus dabo-ins breeds year round and has a reproductive peak in spring. 

 Most individuals probably live only 1 year. 



The only echinoderm present was D. eaaentrious which was represented 

 only by occasional juveniles and is not included in the total fauna anal- 

 ysis. 



The dominant mollusk was T. modesta. There was a significant correla- 

 tion between the total number of individuals and the number of T. modesta 

 (r = 0.91, < p > 0.001), and between the number of species and individuals 

 (r = 0.76, 0.01 < p > 0.001). The only discrepancy was in September 1971 

 when Protothaca stanrinea were as abundant as T. modesta. The P. staminea 

 were gone by the next sampling period. Tell^na modesta abundance through 

 the year characterizes the general temporally sporadic density of juvenile 

 bivalves in the study areas. Again, the largest part of the individuals 

 were juvenile bivalves. 



Over 80 percent of the worm fauna were polychaetes. The dominant 

 species was M. saoculata with the highest number of species and individ- 

 uals in summer. There was no seasonal trend in species diversity or 

 evenness in the worm fauna (Fig. 10) . Both parameters remained relatively 

 stable through time. The high diversity in October 1972 was primarily due 

 to a large decrease in density; the number of species stayed fairly con- 

 stant (Figs. 7 and 10) . 



Species diversity was not computed for the other parts of the fauna 

 because the numbers were too small. 



Polychaetes dominated the 20-meter control station (Table 8) . 

 Magelona saoculata, N. elegans , Lumbri-neris luti , Prinospio pygmaeus , 

 P. airrifera , and Haploscoloplos elongatus were common persistent members 

 of the worm fauna. An average of 80 percent of the species had an abun- 

 dance of less than two individuals per core. Seasonal changes in relative 

 abundances were much greater than changes in species composition (Table 3) . 

 Many species were found in all the sampling periods. A notable exception 

 was the large terebellid polychaete, A. oocidentaUs , which was common 

 after Jime 1972, but had not been found before then. 



At the 10-meter station, the worm fauna accounted for 60 percent of 

 the number of species and individuals. Changes in the number of species, 

 number of individuals, species diversity, and evenness for the total fauna 

 (Figs. 10 and 11) were similar to changes in the same parameters for the 

 worm fauna (Figs. 7 and 10). The seasonal trend in the number of species 

 and individuals was observed for the total fauna (Fig. 11) , and species 

 diversity was fairly constant (Fig. 10) . The low values in July 1971 

 cannot be explained without samples from previous seasons. 



35 



