O' Donne II and others 



Chapter 1 1 



Patterns of Seasonal Variation of Activity 



Table 1 Variations in Marbled Murrelet detections by season at the WaddeU Creek and Opal Creek nest sites. Results are given for each ANOVA comparing 

 total detections, occupied detections, and percent of occupied detections between seasons 



WaddeU Creek 



Season 

 Summer 

 Transition 

 Winter 



ANOVA 



Opal Creek 



Season 

 Summer 

 Transition 

 Winter 



ANOVA 



32 



16 



2 



18 

 11 



2 



50 



12 

 17 



F= 14.6, 



100 

 25 

 80 



F= 16.51, 



32.8 



17.1 



2.8 



(18-176) 



(0-49) 



(15-19) 



df=2, /> = 0.0001 



28.5 (59-159) 



41.5 (0-121) 



22.6 (64-96) 



df=2, /> = 0.0001 



5 8.6 (0-45) 



0.6 (0-2) 



1 0.7 (0-1) 



11, df=2, /> = 0.0230 



2 2.1 (0-7) 



0.3 (0-2) 



0.0 



= 2.51, df=2, /> = 0.1019 



18.6 



8.7 



16.7 



17.1 (0-55.6) 



25.5 (0-100.0) 



23.6 (0-33.3) 



= 2.79, df=2, P = 0.0723 



6.3 

 0.2 



F=7.92, 



6.1 

 0.7 



(0-21.7) 

 (0-2.4) 



df=2, P = 0.0022 



1 Percent of detections < 100 m from the observer 



SITE 



Mar Apr May Jun Jul Aug SepK Oct Ipiyfl Dec Jan Feb 



Mar Apr May Jun Ju1 Aug ; : Se'pK Oct Nov Dec Jan ; Feb 



Figure 1 Results of Ryan-Einot-Gabriel-Welsh multiple range test comparing numbers of detections of 

 Marbled Murrelets per survey between months at three sites in northwestern California, 1989-1991. 

 Months with the same letter indicate that the mean numbers of detections were not significantly different 

 from each other, "n" indicates the number of surveys in the respective month and " x no." is the mean 

 number of detections per survey. Means presented are untransformed values. Surveys from all years were 

 combined for the analysis, and months with less than three surveys were not included in the analysis. From 

 O'Donnell 1993. 



118 



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



