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    Description

    Forest restoration, fuel reduction, and wildlife conservation management requires understanding if, and how repeated prescribed fire, fire severity, or mechanical methods can promote goals. We examined breeding bird response to repeated fuel reduction treatments by mechanical understory reduction (twice; Mechanical-only), prescribed burning (four times; Burn-only), or mechanical understory reduction plus burning (then three subsequent burns; Mechanical+Burn). Initial burns were hotter in Mechanical+Burn than Burn-only resulting in heavy tree mortality, canopy openness, thick shrub density, and abundant snags lasting several years. Relative density and species richness of birds increased in Mechanical+Burn within three breeding seasons of highseverity burns, and remained greater throughout subsequent burns. Increases were due to an influx of species associated with young forest conditions, with little change in most mature forest species. Repeated burning in Mechanical+Burn likely impeded forest maturation, allowing many scrub-shrub bird species to persist. Species richness in Burn-only did not differ from any treatment, but modest increases over time were apparent as structural heterogeneity increased with delayed tree mortality. Cavity-nester density was highest in Mechanical+Burn, but remained high even as snags fell to pretreatment levels. Ground-nester density was lower in Mechanical+Burn than Control and Mechanical-only, but ground-nesting species responded differently. Open woodlands were not created by any treatment due to persistent re-sprouting of top-killed trees and shrubs. We note that breeding birds appear to respond similarly to high-severity burns and silvicultural treatments with heavy canopy reduction, offering possible alternatives in managing upland hardwood forests for diverse breeding bird communities.

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    Citation

    Greenberg, Cathryn H.; Tomcho, Joseph; Livings-Tomcho, Aimee; Lanham, J. Drew; Waldrop, Thomas A.; Simon, Dean; Hagan, Donald. 2018. Long-term avian response to fire severity, repeated burning, and mechanical fuel reduction in upland hardwood forest. Forest Ecology and Management. 424: 367-377. https://doi.org/10.1016/j.foreco.2018.05.014.

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    Keywords

    Breeding birds, Fire severity, Fire surrogate, Fuel reduction, Oak woodland restoration, Prescribed fire, Repeated burns, Upland hardwood forest

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https://www.fs.usda.gov/treesearch/pubs/56800