100000 -I 



< 

 u 



M 



u 



oc 

 u 



o 



CO 



oc 



10000 - 



■:i^"" --r—. 



7-^ •••..V 



100 



COMMON TERN 



ARCTIC TERN 



X 



1900 1910 1920 



— I 1 — 



1930 1940 



YEAR 



1950 



1960 





V. 



\ 



\ 



\ 



1970 



Figure 10. Trends of Arctic and common terns nesting in Maine since 1900. 



49 



