50 n 



45- 



40- 



35- 



5 30- 

 UJ 



a. 



q: 



Hi 



CD 20H 



3 



15- 



10- 



Number of 

 Registrations 



ALL WATER BIRDS • • 



ANATIDAE ONLY A A 



Number of 



Species 

 O O 



1 



1977 



Figure 19. 



1978 



1979 



r250 



-200 



z 

 o 



150 < 



o 



UJ 



100 



OD 



s 



Z 



- 50 



^ 



Year-to-year changes in numbers of species and numbers of registrations 

 of water birds recorded on June runs of five roadside wildlife survey 

 routes. Circle West study area. 



10-1 



9- 



8 



CO 

 UJ 



i 7-1 



o 



6- 



Figure 20. 



1 



1977 



1978 



1979 



Year-to-year changes in June breeding bird species richness for 

 five roadside wildlife survey routes. Circle West study area. 



55 



