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    Author(s): Quresh LatifJamie SanderlinVicki SaabWilliam BlockJonathan Dudley
    Date: 2016
    Source: Ecosphere. 7(5): e01346.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (1.0 MB)

    Description

    Wildfire is a key factor influencing bird community composition in western North American forests. We need to understand species and community responses to wildfire and how responses vary regionally to effectively manage dry conifer forests for maintaining biodiversity. We compared avian relationships with wildfire burn severity between two dry forest locations of Arizona and Idaho. We predicted different responses to wildfire between locations due to regional differences in historical fire regime. We conducted point count surveys for 3 yr following wildfire (Arizona: 1997-1999; Idaho: 2008-2010) and used multispecies hierarchical models to analyze relationships of bird occupancy with burn severity. Consistent with our prediction for mixed- severity fire regimes characterizing the Idaho location, we observed proportionately more positive species occupancy relationships and, consequently, a positive species richness relationship with burn severity in Idaho. We also observed the opposite pattern in Arizona, which was congruent with our prediction for the low- severity fire regime characterizing that location. Cavity nesters and aerial insectivores occupied more severely burned sites following wildfire, corresponding with predicted increases in nesting substrate and foraging opportunities for these species. In contrast, canopy- nesting foliage gleaners and pine seed consumers exhibited negative relationships with burn severity. Our results were consistent with predictions based on species life histories and with patterns from the literature, suggesting generality of observed relationships and locational difference in relationships with wildfire. We therefore suggest that optimal management strategies for maintaining avian diversity could differ regionally. Specifically, intensive fuels management may be ecologically less appropriate for promoting biodiversity in areas such as the Idaho location where mixed- severity wildfires and dense forest stands were historically more common.

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    Citation

    Latif, Q. S.; Sanderlin, J. S.; Saab, V. A.; Block, W. M.; Dudley, J. G. 2016. Avian relationships with wildfire at two dry forest locations with different historical fire regimes. Ecosphere. 7(5): e01346.

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    Keywords

    Arizona, burn severity, disturbance, dry conifer forests, fire regimes, forest bird communities, habitat management, Idaho, multispecies occupancy models, population responses, species richness, wildfire

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