A landowner's guide for restoring and managing Oregon white oak habitats /

Veselý, David; OKeefe, Raven.; Tucker, G. G.

doi:10.5962/bhl.title.144988

Cited by 12 publications

(16 citation statements)

References 0 publications

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“…Our findings have further implications with respect to current oak savanna restoration efforts (Campbell 2004, Vesely & Tucker 2004. Clearly, the ultimate goal of many oak savanna restoration projects is to restore habitat for a broad complement of oak-associated wildlife species.…”

Section: Conservation Implicationsmentioning

confidence: 66%

“…In the last century, white oak savanna has declined to < 1% of its historic range while white oak woodlands have been reduced from an estimated 162,000 ha to <11,000 ha (Vesely & Tucker 2004, ODFW 2006.…”

Section: Study Areamentioning

confidence: 99%

“…Agricultural conversion, urban expansion, and conifer invasion from cessation of historic fire regimes have been primary factors in these declines (Towle 1983, Vesely & Tucker 2004 Within each site, we identified white oak remnant trees as those trees with a diameter-at-breast height of ≥50 cm and having an open-grown "mushroom"-shaped canopy with thickened lateral limbs (Peter & Harrington 2002). We evaluated all potential trees within a site for their structural characteristics and relative isolation in an effort to select trees that represented the variation in these attributes within our study area.…”

Section: Study Areamentioning

confidence: 99%

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Multi-scale factors affecting bird use of isolated remnant oak trees in agro-ecosystems

DeMars

Rosenberg

Fontaine

2010

Biological Conservation

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With recent emphasis on sustainable agriculture, conservation of native biota within agricultural systems has become a priority. Remnant trees have been hypothesized to increase biological diversity in agro-ecosystems. We investigated how remnant Oregon white oak (Quercus garryana) trees contribute to conserving bird diversity in the agro-ecosystem of the Willamette Valley, Oregon, U.S.A. We compared bird use of isolated oak trees in three landscape contexts -croplands, pastures, and oak savanna reserves -and ranked the relative importance of four factors thought to influence bird use of individual trees: (i) tree architecture; (ii) tree isolation; (iii) tree cover in the surrounding landscape; and (iv) landscape context, defined as the surrounding land use.We evaluated species-specific responses and four community-level responses: (i) total species richness; (ii) richness of oak savanna-associates; (iii) tree forager richness; and (iv) aerial and ground forager richness. We documented 47 species using remnant oaks, including 16 species typically occurring in oak savanna. Surprisingly, landscape context was unimportant in predicting frequency of use of individual trees. Tree architecture, in particular tree size, and tree cover in the surrounding landscape were the best predictors of bird use of remnant trees. Our findings demonstrate that individual remnant trees contribute to landscape-level conservation of bird diversity, acting as keystone habitat structures by providing critical resources for species that could not persist in otherwise treeless agricultural fields. Because remnant trees are rarely retained in contemporary agricultural landscapes in the United States, retention of existing trees and recruitment of replacement trees will contribute to regional conservation goals.

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Section: Conservation Implicationsmentioning

confidence: 66%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

See 1 more Smart Citation

Multi-scale factors affecting bird use of isolated remnant oak trees in agro-ecosystems

DeMars

Rosenberg

Fontaine

2010

Biological Conservation

View full text Add to dashboard Cite

show abstract

“…The extensive degradation and loss of oak-dominated communities throughout the Puget Lowland and Willamette Valley adds urgency to efforts to restore these endangered systems (Hanna and Dunn 1996, Vesely and Tucker 2004, Vellend et al 2008. At many sites, oaks are witnessing considerable canopy die-back, alteration in form, and high rates of mortality due to competition for resources by fast-growing firs.…”

Section: Oak Release Activitiesmentioning

confidence: 99%

“…However, mechanical removal of competing conifers is a feasible and effective approach for ensuring survival of canopy oaks (Vesely and Tucker 2004. Beginning in 2006, large numbers of Douglas-fir that were less than 20 cm dbh, and select trees less than 30 cm dbh within one tree height of targeted oaks, were cut from the stand.…”

Section: Oak Release Activitiesmentioning

confidence: 99%