The growth of these plants 



mid-intertidal region and was not 

 fronds by S. a1 term' flora . Unusually 

 intensities durTng the winter and spring 



months were major factors affecting growth in plants that were subjected 



to relatively long periods of tidal exposure. The presence of S^. 



alterni flora during the summer months may act in a protective capacity 



for mid-intertidal ecad populations. (A. A.) 



associated with A. nodosum ecad mackaii 

 was more rapid than those in the 

 affected by the shading of algal 

 high temperatures and light 



Keywords: salt marshes, fucoids, ecads, ecology 



273 



