The California spotted owl: a technical assessment of its current status

Verner, Jared; McKelvey, Kevin S.; Noon, Barry R.; Gutiérrez, R. J.; Gould, Gordon I.; Beck, Thomas W.

doi:10.2737/psw-gtr-133

Cited by 139 publications

(111 citation statements)

References 112 publications

(207 reference statements)

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“…When natural disturbance processes are considered, conservation may dictate reliance on an extensive area of constant habitat change (e.g., a dynamic landscape equilibrium), such as the conservation strategy for the California spotted owl (Verner et al 1992) or northern goshawk in the Southwest (Crocker-Bedford 1990, Reynolds et al 1992), rather than a static reserve design.…”

Section: Goshawk Conservation Strategiesmentioning

confidence: 99%

“…This approach has been used elsewhere (Murphy and Noon 1992, Verner et al 1992, Hayward and Verner 1994. The available information is evaluated to distinguish among three broad conclusions relative to long-term conservation status of goshawks in southeast Alaska: (1) populations of goshawks are secure and likely will remain so given current land management practices, (2) populations of goshawks are in peril (declining or experiencing some demographic trauma) or likely will be in peril in the future given current management practices, or (3) there is insufficient evidence to determine or predict the conservation status of the species.…”

Section: Status Of Northern Goshawks In Southeast Alaskamentioning

confidence: 99%

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Conservation assessment for the northern goshawk in southeast Alaska.

Iverson¹,

Hayward²,

Titus³

et al. 1996

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The conservation status of northern goshawks in southeast Alaska is examined through developing an understanding of goshawk ecology in relation to past, present, and potential future habitat conditions in the region under the current Tongass land management plan. Forest ecosystem dynamics are described, and a history of forest and goshawk management in the Tongass National Forest is reviewed. Nearly 900,000 acres of the most productive old-growth temperate rain forest in southeast Alaska (public and private lands) have been harvested during the past 90 years and changed to early seral conifer forests. Goshawk habitat relations are described through a review of the goshawk literature. Significant preliminary findings of a habitat relation study in southeast Alaska include the following: goshawks select productive old-growth forests with > 60 percent of all adult goshawk telemetry relocations occurring in this cover type; nonforest, clearcut, and alpine cover types were least used and were avoided relative to their availability; and the median breeding season minimum convex polygon use areas of adult goshawks was about 10,000 acres. Goshawks predominantly use gentle slopes (70 percent of relocations) at elevations below 800 feet (54-74 percent of relocations); 24 percent of relocations occurred in riparian habitat zones, and nearly 20 percent of all relocations occurred within the beach fringe habitat extending 1,000 feet inland from the ocean shoreline. Goshawk nesting habitat is a nonrandom subset of the landscape with a significantly higher proportion of productive old-growth forest within a 600-acre analysis area surrounding known nests. The probability of persistence of goshawks has declined over the past 50 years owing to habitat loss and likely will continue to decline under current management plan regimes; however, the goshawk population likely is not in immediate peril. The predicted consequences of several alternative habitat management approaches are compared. This analysis suggests that long rotation forestry (e.g., 300 years) and uneven-aged silvicultural management may maintain habitat characteristics important to sustaining goshawk populations well distributed across the region. Although habitat reserves are not considered an essential component of a forest-wide goshawk conservation strategy, reserves, in combination with extended rotations, may be important where the intensity of past management actions has precluded the opportunity to attain a desired combination of forest age classes achieveable under long rotations. Revision efforts for the TLMP resumed in fall 1994 with a focus on five major land management issues considered to be inadequately addressed in the existing TLMP: wildlife viability, fish and riparian habitat, caves and karst, alternatives to clearcutting, and socioeconomic considerations. Goshawk conservation is an important component within the wildlife viability issue.Concern for goshawk population viability in southeast Alaska evolved during the past decade and culminated with th...

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Section: Goshawk Conservation Strategiesmentioning

confidence: 99%

Section: Status Of Northern Goshawks In Southeast Alaskamentioning

confidence: 99%

Conservation assessment for the northern goshawk in southeast Alaska.

Iverson¹,

Hayward²,

Titus³

et al. 1996

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show abstract

“…These guidelines aimed at protection of options for future management of spotted owl habitat in Oregon, and roughly followed the ISC conservation strategy. Then, by 1992, BLM had revised their district resource management plans and issued a series of drafts (e.g., USDI BLM 1992), which more faithfully followed the ISC strategy and used new technologies to model potential spotted owl response to habitat distribution (McKelvey 1992, McKelvey andothers 1993). …”

Section: No Eis or Record Of Decision In The Federalmentioning

confidence: 99%

Of spotted owls, old growth, and new policies: a history since the Interagency Scientific Committee report.

Marcot¹,

Thomas²

1997

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“…As an example, the CASPO thinning guidelines (Verner et al, 1992) currently used in USFS fire hazard reduction projects throughout the Sierra Nevada, although effective at reducing canopy bulk density and therefore the probability of active crown fire, do not approximate historical forest structure or composition, leading to concerns over longterm ecological integrity (North et al, 2007;North et al, 2009b). However, attempts to rigidly recreate forest ecosystem structures and functions that existed in the preEuroamerican era are likely to be unrealistic in the face of challenges such as invasive species, climate change, and growth of the WUI (Millar et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Treatments on US Forest Service lands were guided by the Sierra Nevada Forest Plan Amendment (SNFPA; USDA, 2004a) and the California Spotted Owl (CASPO) interim guidelines (Verner et al, 1992). The SNFPA requires that at least 50% of initial fuel treatment work in the Sierra Nevada should take place in the WUI until the WUI is sufficiently treated ; the CASPO guidelines call for the thinning of all trees between 25.4 and 76.2 cm diameter at breast height (DBH; 1.37 m) while retaining at least 40% canopy cover or 40% basal area, whichever is more conservative.…”

Section: Introductionmentioning

confidence: 99%

Effects of Wildland-Urban Interface Fuel Treatments on Potential Fire Behavior and Ecosystem Services in the Central Sierra Nevada Mountains of California

Hamma

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The California spotted owl: a technical assessment of its current status

Cited by 139 publications

References 112 publications

Conservation assessment for the northern goshawk in southeast Alaska.

Conservation assessment for the northern goshawk in southeast Alaska.

Of spotted owls, old growth, and new policies: a history since the Interagency Scientific Committee report.

Effects of Wildland-Urban Interface Fuel Treatments on Potential Fire Behavior and Ecosystem Services in the Central Sierra Nevada Mountains of California

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