Day 1 



Day 2 



Day 3 



i9T 



Fox Island 



— 1 — P— : — : — I — r 

 Day 1 



I I I 

 Day 2 



Day 3 



Fig. 4. Seawater temperatures at White Point and Fox Island from October 15-17, 1987 during 3-unit 

 operating conditions. The solid line across the bottom of each graph represents the daily mean temperatures 

 as recorded at Unit 1 & 2 intakes. 



Fouling Species 



Percent cover. The percentage of panel surfaces 

 covered by fouling organisms varied among sites 

 and years and between operational periods (Fig. 

 5). Average values ranged from 95.5% at FI in 

 Nov- May 1987 to < 1% at WP and GN in Aug- 

 Feb 1986. In general, highest percentages occurred 

 at BP and FI, and lowest at EB. The remainder 

 of the panel surfaces was free space, or covered 

 by the calcareous remains of dead barnacles or 

 bryozoans (these dead remains occupied up to 

 40% cover; Fig. 5). 



Almost 300 species of plants and animals, in- 

 cluding both motile and sessile members of the 



local fouling community, have been identified 

 during the exposure panel study (NUSCO 1982). 

 Present studies focus on the sessile assemblages 

 because these aie more likely to influence 

 woodborer abundances (cf. Naix and Saraswathy 

 1971). Of these, only 22 taxa (3 plant and 19 

 animal) occupied a mean of 1 % or more of the 

 panel surface at any site during any exposure pe- 

 riod, during 2-unit or 3-unit operation. The abun- 

 dances of these 22 taxa are presented in Table 2. 



These species exhibited different spatial and 

 temporal patterns of distribution. Some species 

 were ubiquitous, found at all sites in both oper- 

 ational periods, e.g., Balanus crenatus, especially 

 abundant in the Nov-May exposure period. 



Exposure Panel Program 233 



