of snails, barnacles, and mussels were made (snails in the entire 20 x 

 20 cm area, mussels and barnacles in 10 random 2.5 x 2.5 cm subplots). 

 If present, the 20 longest thalli of Fucus vesiculosus were measured in 

 each caged and control area. As with the recolonization transects, an 

 attempt was made to determine the effect that season of denuding has on 

 rates and patterns of recolonization. The caged and control areas were 

 reburned in June 1980 (15 months after the spring denuding), and again 

 in September 1981 (15 months after the summer denuding). A proposed 

 winter denuding in December 1982 will complete a seasonal cycle. 



Algal growth studies are also conducted on Ascophyllum nodosum at 

 four sites: at Giants Neck, White Point, and at two sites on Fox Island- 

 Exposed (one low intertidal, one high intertidal) . Starting in spring 

 of 1979, 50 plants at each site were chosen randomly and tagged; five 

 yegetative tips per plant were marked with colored tapes. Each month, 

 the length of each labeled tip was measured from bladder to apex. Each 

 group of plants was monitored until the following spring, when a new 

 group of plants was chosen and tagged at each site. Because two years 

 of analyses showed no significant differences in growth due to tidal 

 height at the experimental stations, the higher Fox Island site was 

 dropped in spring of 1981. 



In addition to the quantitative studies outlined above, monthly 

 qualitative algal collections have been made at each of the seven rocky 

 intertidal stations since February 1979, and a reference herbarium is 

 maintained. 



Present Procedures 



Based on conclusions drawn from over 2 years of monthly sampling, 

 slight modifications were made to the above program in October 1981. 



