Skip to Main Content
Wildfire impacts on California spotted owl nesting habitat in the Sierra NevadaAuthor(s): Scott L. Stephens; Jay D. Miller; Brandon M. Collins; Malcolm P. North; John J. Keane; Susan L. Roberts
Source: Ecosphere. 7(11): e01478
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (1.0 MB)
DescriptionCalifornia spotted owls (CSOs) (Strix occidentalis occidentalis) have received significant conservation attention beginning with the U.S. Forest Service interim management guidelines in 1992. The most commonly reported forest habitat feature for successful nesting habitat of CSO is canopy cover > 70%. Loss and degradation of Sierra Nevada CSO habitat, however, has been a growing concern, initially from commercial tree harvesting and, more recently, from wildfire. This study examined trends in wildfire impacts on potential nesting habitat of the CSO and discusses different management approaches that might lead to the conservation of CSO in fire-dependent forests. A total of 85,046 ha of CSO potential nesting habitat was burned by fire that resulted in ≥ 50% tree basal area (BA) mortality, reducing canopy cover on average to < 25%, during 2000–2014; this included 2.7%, 12.3%, and 7.6% of dense red fir (Abies magnifica), eastside pine, and westside forests, respectively. Based on regression predictions, within the next 75 yr, the cumulative amount of nesting habitat burned at ≥ 50% tree basal area mortality will exceed the total existing habitat. Four management strategies are discussed that could enhance the conservation of the CSO: (1) increased fire suppression, (2) strategically reducing fire hazards using mechanical treatments and/or prescribed fire, (3) increasing the amount of managed wildfire in CSO habitat, and (4) developing a landscape strategy that uses historical forest structure information to identify areas where high-canopy cover forests are more sustainable. Our estimates of how moderate-and high-severity fire may affect forests into the future poise a substantial threat to CSO persistence. More comprehensive forest restoration activities may be needed in CSO habitat to avoid significant losses of older forests.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationStephens, Scott L.; Miller, Jay D.; Collins, Brandon M.; North, Malcolm P.; Keane, John J.; Roberts, Susan L. 2016. Wildfire impacts on California spotted owl nesting habitat in the Sierra Nevada. Ecosphere. 7(11): e01478.
Keywordscoarse filter, conservation, fine–filter, Jeffrey pine, mixed conifer forests, ponderosa pine, prescribed fire, restoration, wildfire.
- Postfire survival and flushing in three Sierra Nevada conifers with high initial crown scorch
- Bark beetles responses to stand structure and prescribed fire at Black Mountain Experimental Forest, California, USA: 5-year data
- Slash prediction: a test in commercial thinnings in northeasrern California
XML: View XML