Strong and others 



Chapter 32 



Distribution and Population Estimates in Oregon 



60 



50- 



40- 



30- 



20- 



10- 



<=500 1050-1500 2050-2500 3050-4000 5050-6000 



550-1000 1550-2000 2550-3000 4050-5000 



DISTANCE OFFSHORE (m) 



Method: 



| STRIP [ 

 1992 



LINE 



STRIP | 

 1993 



LINE 



Figure 5 Average densities of Marbled Murrelets in 1 km 2 based on line and 1 00 m strip boat transects 

 for nine categories of distance from shore. The 1 992 transects were conducted to a maximum of 2.5 km 

 offshore. 



33 



11 



<=500 1050-1500 2050-2500 3050-4000 5050-6000 



550-1000 1550-2000 2550-3000 4050-5000 



DISTANCE OFFSHORE (m) 



June 1 - July 23 



July 24 -August 15 



Figure 6 Number of Marbled Murrelets per km of vessel transect in nine categories of distance 

 from shore in 1 992, before and after 24 July. Figures at top of bars represent number of 

 kilometers surveyed within each distance category. 



346 



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



