2 — 



X 



< 



-I 



-2 — 



-3 



-3 



-2 



A X 





 I S 



Figure 24-8. A Discriminant Analysis of Data from the 9 MERL 



Microcosms and the 13 Bay Stations Using the Variables: 



Chlorophyll, Zooplankton, Ammonia, Nitrate Plus Nitrite, 



Phosphate and Silicate. 



NOTE: MERL data from August 17 to December 6, 1976. Bay data from 

 1972-1973 survey. For detailed information on the analysis see Table 24-6. 



significantly different from microcosms 3, 5, 9, and microcosm 3 is 

 significantly different from microcosm 9, but the bay stations "Dutch Island," 

 "Southeast Prudence," "East Prudence" and "Mt. Hope Bridge," are not 

 significantly different from any of the microcosms (Table 24-6). Other mid-bay 

 stations are different from some of the microcosms, but no more so than they 

 are with regard to each other. 



These intercomparisons between the MERL microcosms and Narragansett 

 Bay show that the MERL microcosms diverged surprisingly Uttle from stations 

 in the bay or from other microcosms, with regard to concentrations of 

 nutrients, chlorophyll, zooplankton biomass and phytoplankton species 

 composition during the replicability experiment. 



377 



