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Saturday, May 16, 2020 | History

2 edition of Dispersal of juvenile northern spotted owls in western Oregon found in the catalog.

Dispersal of juvenile northern spotted owls in western Oregon

Gary Scott Miller

Dispersal of juvenile northern spotted owls in western Oregon

by Gary Scott Miller

  • 71 Want to read
  • 40 Currently reading

Published .
Written in English

    Subjects:
  • Birds of prey -- Oregon -- Geographical distribution.,
  • Spotted owl -- Geographical distribution.

  • Edition Notes

    Statementby Gary Scott Miller.
    The Physical Object
    Pagination139 leaves, bound :
    Number of Pages139
    ID Numbers
    Open LibraryOL15171283M

    Mortality: Spotted Owls are long-lived - the oldest wild owl known reaching 21 years old. A captive Spotted Owl belonging to ecologist Eric Forsman reportedly reached 32 years old. Mortality in the wild is thought to be very high (60 to 95%) for juveniles, especially during the dispersal stage. Adult mortality is estimated at 5 to 20% annually. Northern goshawks (Accipiter gentilis) and crows may prey on juvenile spotted owls, while great horned owls (Bubo virginianus), red-tailed hawks (Buteo jamaicensis), and golden eagles (Aquila chrysaetos) are likely predators of both juveniles and adults. Great horned owls and barred owls may compete with spotted owls for food and space in some : Strigidae.

    Competitive Interactions and Resource Partitioning between Northern Spotted Owls and Barred Owls in Western Oregon: Progress Report J. David Wiens, Department of Fisheries and Wildlife, Oregon State University Scott A. Graham, Raptor Research Center, Boise State University Robert G. Anthony, U.S. Geological Survey Eric D. Forsman, U.S. Forest Service. The Spotted Owl (Strix occidentalis) is a species of true owl. It is a resident species of old-growth forests in western North America, where it nests in tree holes, old bird of p.

    Spotted Owl information and photography. Local Spotted Owl information and sightings.   Annual mean (filled circles) and median (open circles) natal dispersal distances for Northern Spotted Owls in the Pacific Northwest, USA, – Values are shown for years for which adequate data were available (–).Cited by: 4.


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Dispersal of juvenile northern spotted owls in western Oregon by Gary Scott Miller Download PDF EPUB FB2

Dispersal of juvenile northern spotted owls (Strix occidentalis caurina) was studied in western Oregon from The study was initiated to document the pattern of juvenile spotted owl dispersal, survival, habitat use, and possible effects of forest fragmentation on the dispersing juveniles in the Pacific Northwest Douglas-fir by: DISPERSAL OF JUVENILE NORTHERN SPOTTED OWLS IN WESTERN OREGON by Gary Scott Miller A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science Completed Ma.

Graduation date: Presentation date: Dispersal of juvenile northern spotted owls (Strix occidentalis caurina) was studied in western Oregon from The study was initiated to document the pattern of juvenile spotted owl dispersal, survival, habitat use, and possible effects of forest fragmentation\ud on the dispersing juveniles in the Pacific Northwest.

northern spotted owls during natal dispersal in western Oregon, Older forest (old-growth and mature stands) was the vegetation type used most frequently during transience (%) and colonization (%), and spotted owls selected closed-canopy forests over open-canopy forests during both phases of dispersal (P.

metapopulation models or individually-based models that assume the success of juvenile dispersal in a frag- mented landscape is a primary factor determining the future existence of spotted owls in the Pacific Northwest. Item Dispersal of Juvenile Northern Spotted Owls in Western Oregon. Master of Science Thesis, Oregon State University, Corvallis.

p., Add to Shelf. Study conducted to document the pattern of juvenile spotted owl dispersal, survival, habitat use, and possible effects of forest fragmentation on dispersing juveniles. In western Oregon, dispersal of juvenile (young of the year) northern spotted owls was documented in October and from early September to early November.

Information on California spotted owl dispersal is sparse. Fig 2 Straight-line dispersal paths of juvenile spotted owls banded in Oregon or Washington and recaptured after dis. the relationship between dispersing spotted owls and forest conditions across a landscape.

This study,conducted in western Oregon,found a strong association between locations of dispersing spot-ted owls and old-growth forests (Miller et al).

During the transience phase of dispersal, old-growth forest was used in proportion to its avail. Many populations of spotted owls continue to decline, especially in the northern parts of the subspecies’ range, even with extensive maintenance and restoration of suitable habitat in recent years.

The spotted owl has become rare in British Columbia, southwestern Washington, and the northern coastal ranges of Oregon. We tested 6 null hypotheses examining the relations between habitat selection, forest fragmentation, and the probability of mortality for juvenile northern spotted owls during natal dispersal.

Prey species of spotted owls were identified by analyzing pellets. STUDY AREA We collected pellets from four sites near Pelican Butte, km west of Upper Klamath Lake in Klamath County, southwestern Oregon.

The sites were located on the northwest, northeast, south- west, and southeast slopes of Pelican Butte. Influence of prey abundance on northern spotted owl reproductive success in western Oregon Daniel K.

Rosenberg, Keith A. Swindle, and Robert G. Anthony Abstract: The hypothesis that high temporal variability of northern spotted owl (Strix occidentalis caurina) reproduc-tive success is a response to prey abundance remains largely untested. A Spotted Owl researcher describes the problems these birds have when faced with a more powerful and competing species, the Barred Owl.

Each of these owls is brown with white spots, but the northern spotted owl is the darkest brown with the smallest spots and has darker facial disks (the feathers surrounding the eyes). Northern spotted owls are about feet ( meters) in length with a wingspan up to four feet ( meters).

Females are larger than males. Abstract: "Current management for the northern spotted owl (Strix occidentalis caurina) is largely driven by metapopulation models or individually-based models that assume the success of juvenile dispersal in a fragmented landscape is a primary factor determining the future existence of spotted owls in the Pacific Northwest.

ed Spotted Owls, providing insights into the spe-cies longevity. In addition, the first study of dis-persal of juvenile Spotted Owls in Oregon was conducted on the HJA (Miller ), along with research on Spotted Owl prey species (Rosenberg ) and the influence of habitat fragmentation on owl populations (Johnson ).

and used by Northern Spotted Owls in south- western Oregon was related to the character of the prey base, forest type, and extent of forest fragmentation. Northern Spotted Owls that con- sumed primarily northern flying squirrels (X mass = g; Carey ) and hunted among fragmented forests dominated by Douglas-fir.

The Northern Spotted Owl, Strix occidentalis caurina, is the only subspecies of Spotted Owl found in Canada. This subspecies is distributed from the southwest mainland of British Columbia through western Washington, western Oregon and the coast ranges of California to San Francisco Bay (Figure 1).

Although the current range is similar to the historic range, the. The Barn Owl Trust’s biggest-ever research project (Barn Owls and Major Roads) included a detailed investigation into dispersal behaviour and mortality.

Within the page report we produced a 2-page section called The Brood Of which, if you are really interested in Barn Owl dispersal and mortality, is well worth reading. Correlations between the home-range size of northern spotted owls (Strix occidentalis caurina) and proportion of their range in old-growth forest have been reported, but there are few data on the relationship between their home-range size and primary prey of spotted owls are wood rats and northern flying squirrels (Glaucomys sabrinus).Wood rats are larger and Cited by: occupied by one or two owls with unknown status (Appendix A).

At least one spotted owl was detected at 46 ( %) of the sites (Appendix A). Spotted Owl Occupancy We identified 72 individual, non-juvenile, spotted owls (41 males and 31 females) inresulting in a male:female ratio of Of the 60 non-juvenile owls where age was.Alternative D would better support east-west northern spotted owl dispersal-capability between the Oregon Coast Range and Oregon Western Cascades provinces then would the other alternatives and comparable to the full capability of BLM-administered lands determined by the No Timber Harvest reference analysis.