comparison of the numbers of colonies in Figures 27 and 28 and 

 percent of areas covered shown in Figures 29 and 30. For example, 

 the peak numerical set in June- July of the cumulative Site 1 data in 

 relation to area coverage indicates a mean individual colony size of 

 only 0.27 square inch, whereas the relatively low number of colonies 

 per square foot in February-March had a mean individual colony 

 size of 2.9 square inches. 



Figure 27 and 29 indicate the occurrence of bryozoa at Site 2 only 

 in November-December and April-May; however, it is probable that 

 early bryozoan stages were overlooked on the monthly panels as were 

 the calcareous tubeworms. This oversight is indicatedby the occurrence 

 of encrusting bryozoa on all 2-month panels for Site 2 as shown in 

 Figure 18. 



Encrusting bryozoans can contribute appreciably to the fouling 

 complex as demonstrated in Figure 29 on the July-August 1-month 

 panel and in Figure 30 on the April-September 5-month and April- 

 December 8-month panels for Site 1. Figure 30 shows that the percent 

 coverage by encrusting bryozoan fouling on bottom test cylinders was 

 only sightly more than on Site 2 panels, but considerably less than on 

 Site 1 panels for comparable time intervals. Bryozoans of this type 

 effectively cover and kill such organisms as calcareous tubeworms and 

 barnacles. The importance of this fouler in the complex is not particu- 

 larly significant in coverage, weight, or resistance to current; however, 

 these organisms would be particularly effective in covering sensitive 

 membranes or small mechanisms. 



Stolonate bryozoans were recognized on many of the panels. In 

 some panels their light weblike growths covered one-half or more of 

 the panel but were so delicate that they were not considered as signifi- 

 cant fouler s. Site 2 monthly panels from June- July through September- 

 October 1957 were half or fully covered with weblike colonies. There 

 is evidence that these organisms are capable of holding a silt load. 



E. Jingle Shells and Other Attached Molluscs 



In the report of Site 1 data for 1956-57, Maloney (1958) 

 treated only the mollusc Anomia (jingle shell), but there were sufficient 

 data from Site 1, 1957-58 and Site 2, 1957-59 to justify the inclusion of 

 mussels and oysters in this writing. The combined 1956-58 data for 

 Site 1 are presented in Figure 32. 



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