Table 22, Comparison of species diversity (Simpson's X) and faunal 

 similarity (Morisita's CA) values. 







Simpson' 



s A 



Morisita's CX 



Nov. 



Nov. -Dec. 



May 



Nov. 



May 



Station 



1974 



1979 



1975 1980 



1974-1979 



1975-1980 



1 



0.49 



0.34 



0.48 0.82 



0.05 



0.82 



2 



0.53 



0.13 



0.66 0.17 



0.44 



0.31 



3 



0.22 



0.13 



0.32 0.08 



0.51 



0.19 



4 



0.29 



0.22 



0.30 0.21 



0.33 



0.22 



5 



0.18 



0.13 



0.17 0.13 



0.53 



0.61 



Control sites 













C A 



0.20 



0.05 



0.10 0.11 



0.11 



0.55 



C B 



0.33 



0.11 



0.15 0.16 



0.09 



0.26 



Borrow sites 













B 1 



1 



0.29 



. 12 







B 2 



~ 



0.34 



0.13 













Borrow and control sites 



0.81 



B 1 to B 2 



0.39 









B 1 to C A 



0.25 



0.66 









B 1 to C B 



0.18 



0.26 









B 2 to C A 



0.27 



0.54 









B 2 to C B 



0.05 



0.18 



■•^No comparable 



data. 



(3) Species Composition . An examination ^%i the tables in Appendix 

 C and Tables 13, 14, and 15 shows that there is a gre-^t deal of difference 

 between the community composition of 1974-75 and 1979-80. A superficial 

 examination of Tables 13, 14, and 15 indicates that at most of the stations 

 the dominant species have changed. However, a more detailed look at the com- 

 posite species lists for 1979-80 (see App. B) and the 1974-75 list (Saloman, 

 1976) indicates that few species were unique to either study. Not evident 

 from the data in these tables is the fact that nearly all the species reported 

 for this study were also reported by Saloman (1976), although not for corre- 

 sponding sampling periods. 



(4) Species Diversity and Equitability . Overall, the species 

 diversity for the 1979-80 data was higher than for the 1974-75 data (Tables 

 20 and 21). This is because the total number of species collected at most 

 stations was greater in 1979-80. Equitability was also somewhat higher for 

 the present study, although not as marked as species diversity. This indi- 

 cates that although there were more species collected during the two sampling 

 periods of the present study, the evenness of the species distributions was 

 comparable for both studies. 



(5) Faunal Similarity. Morisita's index of faunal similarity was 

 used to compare the 1979-80 and 1974-75 data by station (Table 22). As can 

 be seen, the level of similarity based on the number of species in common 

 and their relative proportions is quite low for all comparisons except 

 station 1 versus 1 for May and borrow site 1 versus 2 for May. 



45 



