< 



UJ 



I— 

 —I 



Z> 



Q 



< 



Z 



10^ 



10^ 



10^ 



10' 



10^ 



10^ 



Observer 1 



y = -107+1.7X 



Observer 2 

 V= 174+0.30X 



10^ 



NUMBER OF NESTS 



Figure 11. Aerial estimation of adults vs. nest counts at nine Maine gull colonies, 31 May 1977. 

 Least squares regression equations are given for each of two observers. 



45 



