Hamer and Nelson 



Chapter 6 



Characteristics of Nest Trees and Nesting Stands 



Table 3 The mean, standard deviation, range, and sample size for platform and tree characteristics of Marbled Murrelet tree nests (n = 61) located in North 

 America. The Pacific Northwest data include nests located in California, Oregon, Washington, and British Columbia. For some characteristics, either no data 

 were available for that state or province, or the sample size was too small to calculate the mean and range. Calculations were rounded to the nearest cm for all 

 measurements except nest substrate depth. Sample sizes for each variable are shown in parenthesis. 



Tree species 



Douglas-fir 

 Western he 



Western red cedar 



Coastal redwood 



Tree diameter (cm) 



278136 



139-533 



(10) 



192147 



127-279 



(22) 



I5245 



88-220 



(5) 



Tree diameter at nest height (cm) 



Branch height (m) 



h diameter at trunk (cm) 



Branch diameter at nest (cm) 



h crown position (pet) 



Branch orientation ( ) 



tance trunk to nest (cm) 



6266 

 0-224 

 (13) 



Nest platform length (cm) 

 platform width (cm) 



HHB 



Nest platform moss depth (cm) 



Cover above nest (pet) 



7914 



40-100 



(18) 



1000 



100-100 



(2) 



74 



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



