FREQUENCY RESPONSE OF A MARINE ECOSYSTEM 



23 



800 



o ™ 



QC — "D 



< I- ^ 400 

 S Q °' 



(a) 



(b) 



64,000 



I I I I I "ll i I I I I T 

 1960 1962 1964 1966 1968 1970 1972 1974 



Fig. 1 Time-series data taken at weekly intervals in Narragansett 

 Bay, Rhode Island, from 1959 to 1975. Ammonia (c) sampling was 

 begun in 197 2. Phytoplankton cell abundances (d) were counted 

 beginning in 1960. Samples for 1975 have yet to be counted. 



