3 6-1 



34 



3 2- 



30- 



5 



o 2 8 



2 6 



24- 



2.2- 



20- 



1977 



,• 



>r 



/ 



/ 



\ 



\ 



.\ 



N,~ 



— I 1 1 



1978 1979 1980 



Figure 17. Year-to-year changes in June breeding bird community sigma for 

 five roadside wildlife survey routes, Circle West study area. 



70-1 



60- 



o 50- 



00 40 



3 



30- 



20- 



>/ 



.-— -.-^« 



-t^^ 



.♦. 



> 



1977 



1978 



1979 



1980 



Figure 18. Year-to-year changes in June breeding bird species number 

 (exclusive of summer visitors and water birds) for five 

 roadside wildlife survey routes, Circle West study area. 



-47- 



