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 •—+ — 2 MONTHS 

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APR. MAY JUN. JUL. AUG. SEP. OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUN. 



FIGURE 10 SITE 2 TOTAL FOULING COMPLEX WEIGHTS FOR 1-, 

 2-, AND 3-MONTH PANELS 1957-1959. 



Panel analysis included data on the percent of the panel covered by- 

 each of several basic groups of sessile macroscopic foulers. Many 

 of the panels are recorded as having coverage in excess of 100 percent, 

 indicating that organisms were literally growing on top of each other 

 or in some panels occupying the same general area (Fig 12)„ Cumulative 

 and monthly curves for Site 1 are very close, whereas the monthly 

 panel coverage curve for Site 2 exceeds the cumulative curve as much 

 as 250 percent. This fact indicates that a much greater winter decay 

 (natural deaths, loss from foragers, mechanical loss, etc„) of certain 

 foulers or groups of foulers occurs at Site 2. 



A summary of the fouling weight per square foot for all Site 1 and 

 Site 2 panels as shown in Figures 3, 4, 5, and 6 is presented in Figure 

 13 in the form of graphic envelopes. Ultimate set and growth weight 

 was greater, and the rapidity of set and growth was accelerated for Site 

 2 in comparison to Site 1„ The fact that Site 2 panels were always 

 introduced 2 months later in the year probably influenced the magnitude 

 of growth and set because the last 2 months (April-May through May- 

 June) are in the spring onset period, with new set and growth replacing 

 the winter decay and augmenting the carryover to some extent. It is 

 also pertinent that the first few months of Site 2 testing are in a period 

 more conducive to growth than are the first months for Site 1„ 



The cumulative curve presented in Figure 11 for Site 4 panel data 

 indicates that a 6-month panel had only 5 ounces of fouling per square 

 foot, whereas Sites 1 and 2 had 16 and 8 ounces, respectively, for the 

 same time interval. A bottom test cylinder was fouled only 1.5 ounces 



12 



