Recovery Plan for the Northern Spotted Owl - DRAFT

Table 2.2. Median amounts of old-growth and mature forest (in acres) in annual pairhome ranges of spotted owls, by state and physiographic province.State Number RangeLocation of ForestSite Pairs Typeb Median Min Max SourcescCaliforniaKlamath MountainsUkonom 9 MC 2,484 1,030 5,654 1,2Mad River 12 MC 1,365 835 1,953 1,2Six Rivers National Forest 2 MC 800 367 1,233 3OregonKlamath MountainsSouth Umpqua 3 MC 615 563 768 4Cow Creek 6 MC 1,549 1,450 1,983 4Coast RangesTyee 5 DF/HEM 2,031 1,645 3,984 4Peterson 4 DF/HEM 2,609 1,284 3,196 4Eugene BLM 4 DF/HEM 1,783 799 3,580 5Otherc 4 DF/HEM 2,375 1,795 2,625 6Kelloggd 5 MC 1,018 697 1,983 4West Slope Cascades 9 DF/HEM 1,796 1,050 3,786 7,8WashingtonWest Slope Cascades 11 DF/HEM 3,281 1,715 8,998 9,10,11Olympic Peninsula 7 HEM/DF 4,579 2,787 8,448 12(Note -Table follows Thomas et. al. (1990) with changes based on Forsman and Hays (pers. comm))aMC = mixed conifer, DF/HEM = Douglas-fir, western hemlock, HEM/DF = mostly western hemlock with Douglas-fir intermixed.bl = Paton et al (1990), 2 = Paton (pers comm ), 3 = Solis (1983), 4 = Carey (pers. comm ), 5 = Thraikill and Meslow (pers. comm ), 6 = Carey et al. (1990),7 = Forsman and Meslow (1985), 8 = Miller(pers. comm.), 9= Allen etal. (1990), 10= Haysetal. (1989), 11 = Hamer(pers. comm),12 = Forsman (pers. comm.).cIncludes four sites in the southern Coast Range near Roseburg.dThis was a relatively dry area bordering the Umpqua River valley, characterized by mixed conifer forest more typical of the Oregon Klamath provincethan the Coast Ranges.24pairs) and the pairs were sampled only for a short time. Thus, both the homeranges and the amount of late seral stage habitat of the study birds were likelyto have been underestimated. In any event, the object of Solis' (1983) studywas to quantify owl habitat structure and not to provide an accurate estimateof home range size. In the second study (Carey in Thomas et al. 1990:197), thesample of pairs was small and the study was located in an area of clumpedhabitat distribution. In a third study, Kerns (1989) reported on the habitat useof eight spotted owls occupying "managed" redwood forest with less than 1percent old-growth, although he did not estimate home range sizes of hismarked owls. However, stands used by owls in Kern's (1989) study oftencontained residual old-growth trees and also had a structure similar to matureforests.Some animals do not exhibit fidelity to an area, and are considered to benomadic. Juvenile animals often wander widely in search of a secure homerange. Such wandering animals are engaging in dispersal. Some birds maymove within or among the territories of other birds, without exhibiting fidelity