Four major station groupings are evident in Figure 7. Group I is 

 composed entirely of borrow stations (3 and 4 in December and March, 

 and 4 in September). Group II is composed of borrow station 3 in June 

 and September, along with control station 1 in September. The control 

 station had several numerically important species in common with one or 

 the other of the borrow stations in this group, including the bivalves 

 E. aoncentrioa , T. stimpsoni , and P. tvidentata, and the polychaetes 

 L. tenuis and Axiothetta mucosa. Another reason for the association of 

 the control station with the borrow stations in this group is the 

 relatively large number of both species and individuals that it 

 contained in this sampling period. As discussed previously, this was 

 the only time that the two control stations themselves differed 

 significantly in numbers of species or faunal abundance. Group III is 

 composed entirely of control stations (stations 1 and 2 in June and 

 March, as well as station 2 in September). Group IV is composed of 

 control stations 1 and 2 in December and borrow station 4 in June. 

 This association is largely explained by the great numbers of E. nitens. 

 occurring at all these stations on these dates. 



The associations indicated in the dendogram are due mainly to 

 similarities among groups of either control or borrow stations. This 

 suggests that the borrow station populations are different from the 

 control station populations. The relatively few cases in which borrow 

 stations were grouped with control stations usually could be attributed 

 to the common occurrence of one or two abundant species. 



Species diversity (H') and equitability (e) values for each 

 station are shown in Table 3. On all sampling dates except June, the 

 diversity values for the borrow stations were slightly higher than 

 those for the controls. At borrow station 4 in June, large 

 concentrations of the bivalves E, n%tens and E. conoentviea resulted 

 in both low equitability and H' values. 



Table 3. Shannon-Weaver species diversity (H') and Equitability (e) 

 values for each station by sampling date. 





Sampling Date 





June 1977 



Sept. 1977 



Dec. 1977 



Mar. 1978 



4.4462 



4.4483 



2.1148 



4.3555 



2.7150 



2.4722 



1.4317 



2.7374 



4.1610 



4.6269 



2.2006 



4.4412 



2.6339 



2.8505 



1.5552 



2.7537 



4.7772 



4.6399 



5.1802 



4.9993 



2.5102 



2.3985 



2.6015 



2.7377 



2.2408 



5.0037 



4.8084 



5.2989 



1.2360 



2.8139 



2.7268 



2.9123 



20 



