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    Abundance and habitat relationships of breeding birds in the Sky Islands and adjacent Sierra Madre Occidental of northwest Mexico

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    Author
    Flesch, Aaron D.
    Gonzalez Sanchez, Carlos
    Valenzuela Amarillas, Javier
    Affiliation
    Univ Arizona, Desert Lab, Sch Nat Resources & Environm
    Issue Date
    2016-06
    Keywords
    distance sampling
    Madrean Sky Islands
    Mexico
    mixed-conifer forest
    oak woodland
    pine-oak woodland
    Sierra Madre Occidental
    
    Metadata
    Show full item record
    Publisher
    WILEY-BLACKWELL
    Citation
    Flesch, A. D., Sánchez, C. G. and Amarillas, J. V. (2016), Abundance and habitat relationships of breeding birds in the Sky Islands and adjacent Sierra Madre Occidental of northwest Mexico. J. Field Ornithol., 87: 176–195. doi:10.1111/jofo.12151
    Journal
    JOURNAL OF FIELD ORNITHOLOGY
    Rights
    © 2016 Association of Field Ornithologists
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The Sierra Madre Occidental and neighboring Madrean Sky Islands span a large and biologically diverse region of northwest Mexico and portions of the southwestern United States. Little is known about the abundance and habitat use of breeding birds in this region of Mexico, but such information is important for guiding conservation and management. We assessed densities and habitat relationships of breeding birds across Sky Island mountain ranges in Mexico and adjacent portions of the Sierra Madre from 2009 to 2012. We estimated densities at multiple spatial scales, assessed variation in densities among all major montane vegetation communities, and identified and estimated the effects of important habitat attributes on local densities. Regional density estimates of 65% of 72 focal species varied significantly among eight montane vegetation communities that ranged from oak savannah and woodland at low elevations to pine and mixed-conifer forest at high elevations. Greater proportions of species occurred at peak densities or were relatively restricted to mixed-conifer forest and montane riparian vegetation likely because of higher levels of structural or floristic diversity in those communities, but those species were typically rare or uncommon in the Sky Islands. Fewer species had peak densities in oak and pine-oak woodland, and species associated with those communities were often more abundant across the region. Habitat models often included the effects of broadleaf deciduous vegetation cover (30% of species), which, together with tree density and fire severity, had positive effects on densities and suggest ways for managers to augment and conserve populations. Such patterns combined with greater threats to high-elevation conifer forest and riparian areas underscore their value for conservation. Significant populations of many breeding bird species, including some that are of concern or were not known to occur regionally or in mountain ranges we surveyed, highlight the importance of conservation efforts in this area of Mexico.
    Note
    12 month embargo
    ISSN
    0273-8570
    DOI
    10.1111/jofo.12151
    Version
    Final accepted manuscript
    Sponsors
    National Park Service; Desert Southwest Cooperative Ecosystem Studies Unit; U.S. Fish and Wildlife Service; Sky Island Alliance; Veolia Environment Foundation; University of Montana Graduate School
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1111/jofo.12151/full
    ae974a485f413a2113503eed53cd6c53
    10.1111/jofo.12151
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