Raphae;! and others 



Chapter 18 



Landscape-level Analysis of Habitat in Washington 



of ( J c/-) 30m (U.S. Geological Survey 1990). The original 

 cell resol ution of 90 m was resampled to 200 m to create a 

 statewide elevation grid. Elevations were recorded as height 

 above sea level in meters. 



Results 



Basin-I ,t vel Analysis 



Landscape characteristics for the WDFW data by major 

 river basin (table 6) show the majority of the basins' area is 

 in the "other forest/unknown" category ( x = 84 percent). 

 Two basins have 100 percent of their area in this class. 

 Mean proportion of old growth was only 5 percent over all 

 25 bsisins, although one basin (number 21) had 21 percent of 

 its a'rea in old growth (table 6). Pattern statistics calculated 

 on these basins show a low diversity of types ( x = 0.57), a 

 hig.h dominance ( x = 0.94) or influence of one or a few 



types, and a high contagion ( x = 4.55) or "dumpiness" in 

 the data (table 6). 



In contrast, the WDNR serai-stage data (table 7) show 

 a more even distribution of classes. Late-serai classes 

 averaged 15 percent of the basin's area, and had higher 

 mean patch sizes ( x = 69 ha) than the mean patch sizes of 

 old growth from the WDFW data set (10 ha) (table 6). 

 Pattern indices show the WDNR serai stage data by basin 

 as relatively less "clumpy" ( x contagion = 5.58), and with 

 a greater diversity ( x = 1 .40) than the WDFW classification. 

 Basins classified using the WDNR serai stages also have a 

 greater proportion of area in mid-serai ( x = 27 percent) 

 and cleared (x =32 percent) classes. 



The range outlined in figure 1 encompasses about 5.2 

 million ha, over half of which is privately managed (2.9 

 million ha, 56 percent). Another 0.6 million ha (12 percent) 

 are managed by the Washington Department of Natural 



Table 6 Water Resource Inventory Area (WRIA) basin characteristics: Landscape pattern indices and proportion of basin area in cover classes, 

 Washington Department of Fish and Wildlife cover classification (Eby and Snyder 1990, Collins 1993Y 



See figure 1 for location of each basin; table excludes fragments of WRIA basins 38, 39, and 45 along western boundary of range. 



184 



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



