436 



VADAS, KESER, AND LARSON 



Fig. 1 Location of Maine Yankee Atomic Power Company 

 (MYAPCO) and the control, Hodgson Island (HI), and experimental, 

 Bailey Point (BP), Young Point (YP), and Foxbird Island (FI), sites. 

 Arrows on left inset indicate sea water intake and the former surface 

 discharge, and D denotes the position of the diffuser system. 



transformed with an arc sine function and averaged and compared 

 with an analysis of variance and Duncan's multiple range test. 



The standing crop of Ascophyllum was determined by scraping 

 the holdfasts of plants from rock surfaces in 25- by 25-cm quadrats. 

 Samples were collected only once at Foxbird Island since the 

 discharge was relocated because of the stressed nature of this 

 population and the destructiveness of harvest sampling, especially to 

 the reestablishment of Ascophyllum (Virville, 1953; Printz, 1959). 



Apical tip elongation was shown to be a very rapid and sensitive 

 indicator of thermal stress (Vadas, Keser, and Rusanowski, 1976) 

 and was used to characterize growth. As in our previous study, two 

 groups of 20 plants each were tagged in zone 2. Five apical tips per 



