MID-MONTH 

 EXPOSURE PERIODS 



A~7 



/M 



M I/ 1 



/j 



/A 



a/ 









/J 



J 7 

 / F 



F y 



/A 



a y 



/j 



MONTHLY PANELS 





SITE I 



1 



CC 



6 



14 



(Number 

 27 



of tubes 

 5 



/ ft2) 

 















SITE 2 



















22 







2 











NO 

 RUNEL 







oc 



oc 



CUMULATIVE 





SITE 1 



1 



2 



3 



(Number of months exposed 

 4 5 | 6 | 7 | 8 | 9 | 10 



II 



12 







PANELS 



1 



a 







12 



(Number of tubes / ft^) 



1 1 1 1 1 163 







a 







SITE 2 







1 



(Number of months exposed] 



2 I 3 1 4 1 5 1 6 1 7 1.8 



9 



10 



II 



12 



PANELS 















(Nurr 

 



iber 

 CC 



of tubes 

 CC 



/ ft") 



oc 







5 



CC 



CC 



SITE 3 



















5 



(Months exposed) 

 1 1 1 1 



BOTTOM 

 TEST CYLINDER 



















27 



(Percent exposed 

 surface covered) 



SITE 4 



(* 



umbi 

 1 



:rs 

 2 



of M 



onth 

 4 



} Ex 



pose 

 6 



d) 















PANELS 















9 























BOTTOM 

 TEST CYLINDER 

































CC-AMPHIPOD TUBES TOO NUMEROUS TO COUNT 

 TABLE 2. AMPHIPOD TUBE OCCURRENCE. 



Table 2; otherwise, listing may be shown as many, too numerous to 

 count, or as percent coverage as in Site 3 bottom test cylinders. 



Monthly data for Sites 1 and 2 indicate that maximum tube develop- 

 ment occurs in April-May and May-June. A close examination of 

 Table 2 reveals little pattern or trend except the maximal develop- 

 ment mentioned above, which carries over into the cumulative panels 

 for Sites 1 and 2. The heavy mats of tubes covering 27 percent of the 

 exposed surface area of the bottom test cylinders for Site 3 were 

 tightly packed and 3/4 to 1 inch in thickness. The occurrence designa- 

 tion, too numerous to count, in the 11- and 12-month cumulative panels 

 is undoubtedly a product of the April-May and May-June periods of 

 development. A second development peak is indicated in the 5-month 

 June-November and 7-month June-January panels of Site 2 and in the 

 5-month bottom test cylinders of Site 3. These two development 

 periods could be described as early winter and spring and probably 

 follow movement patterns of the responsible amphipods. The amphipods 

 constructing tubes in this area have been identified as Corophium 

 acherusicum Costa. 



38 



