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

 FIGURE 34 INDIVIDUAL AND COLONIAL TUNICATES. 



No tunicates were found on Site 4 panels nor on Site 4 bottom test 

 cylinders; however, they were present on Site 3 bottom test cylinders 

 in limited numbers. The presence of tunicates on the 2-, 3- and 4- 

 month panels removed from Site 1 in mid-April indicates that objects 

 introduced earlier in the year than mid-April would have greater 

 tunicate set and growth. 



G. Amphipod Tubes 



Amphipods were discussed briefly by Maloney (1958), but the 

 dwelling tubes built by some species of this Order were not men- 

 tioned. Amphipod tubes or cases are constructed of mud, sand, and any 

 readily available debris cemented by a glandular secretion. An attempt 

 was made throughout the analysis to record amphipod concentrations; 

 however, these data have been disregarded because the nonsessile 

 nature of these crustaceans prevented accurate counts. Data on coverage 

 of exposed area were good for bottom test cylinders but not satisfactory 

 for regular test panels. In a few panels, tubes were readily counted; 

 however, as numbers increased counting became almost impossible, 

 and they were recorded as too numerous to count (Table 2). Numbers 

 of amphipod tubes per square foot are indicated where possible in 



37 



