O'Donnell and others 



Chapterll 



Patterns of Seasonal Variation of Activity 



O 



LLI 



111 



O 

 u. 

 O 



- 



LU 



m 



MAY 



JUNE 



JULY 



AUGUST 



MONTH 



Figure 2 Number of detections of Marbled Murrelets by survey month on 20 

 general surveys (Paton, this volume) along roads, central Oregon Coast Range. 

 1988. From Nelson 1989. 



300 



O 200 



W 



E 



150 



O 

 V) 



~ 100 

 O 



- 



V> 



MAY 16-30 JUN 12-25 JUL12-27 



MAY31-JUN11 JUN26 - JUL11 JUL28-AUG15 



TWO-WEEK PERIODS 



Figure 3 Total number of Marbled Murrelet detections for each 

 two-week period from 1 6 May to 1 5 August, 1 990. at 41 sites (245 

 survey mornings) in northwestern Washington. From Hamer and 

 Cummins 1990. 



300 



250 



200 



U. 150 

 O 



ffi 100 



5 



50 



9 13 20 27 3 10 17 24 1 



MAY 



JUNE 



15 22 29 S_ 



MM 



JULY 



Figure 4 Total number of Marbled Murrelet detections for each one- 

 week period from 9 May to 9 August, 1991 , at 75 sites (287 survey 

 mornings) in northwestern Washington. From Hamer and Cummins 

 1991. 



USDA Forest Service Gen. Tech. Rep. PSW-152. 1995. 



119 



