Abstract
Urbanization brings dramatic and sudden changes to ecological conditions affecting natural communities. Cavity-nesting birds, both primary and secondary (hereafter PCN and SCN, respectively), may be limited in this novel environment because of reduced abundance of nesting sites (e.g. snags and cavities) and competition for cavities with non-native species. But humans can also directly and indirectly provide nest sites (e.g., nest boxes, crevices on houses), especially for SCN species, potentially partially compensating for negative effects. We investigated whether and how PCNs and humans facilitated the cavity-nesting bird community along a gradient of urbanization. To do so, we estimated the abundance of cavity-nesting species between 1998 and 2010 at 135, 1-km2 sites that differed in the degree of urbanization (0–100 % forest cover). Also, we found 367 nests on a subset of 31 sites. PCNs (n = 67 nests) nested mostly on snags (98.5 %), while native SCNs (n = 141) used both natural (71.63 %) and anthropogenic (28.37 %) cavities. Non-native SCNs (n = 159 nests) used mostly anthropogenic cavities (98.11 %). PCN abundance facilitated native SCN abundance on sites with more than 12 % forest cover at 1-km2 scale, but not at less forested sites. There, native SCNs nested primarily (59 %) in anthropogenic cavities. Human facilitation allowed native SCNs to successfully use and reproduce where snags were scarce, changing the composition and structure of the cavity-nesting bird community within the most urbanized sites. Flexible nest site selection and human facilitation provide new opportunities for native cavity-nesting birds in a rapidly changing world.
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Acknowledgments
Tina (Rohila) Blewett, Heather Cornell, Roarke Donnelly, Laura Farwell, Cara Ianni, David Oleyar, Stan Rullman, Thomas Unfried, Kara Whittaker, Sean Williams, and John Withey (among many others) helped collect the data we present. Jon Bakker, Carol Bogezi, Jack DeLap, Michael Heimbuch, Joshua Lawler, Loma Pendergraft, Martin Raphael, Kaeli Swift, and Lauren Walker provided invaluable comments to improve this manuscript. This research was funded by U.S. National Science Foundation (DEB-9875041, IGERT-0114351, BCS 0120024, and BCS 0508002). JAT was partially funded by a Fulbright-Conicyt scholarship and by the School of Environmental and Forest Sciences scholarship.
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Relative abundance of primary cavity-nesting species along the gradient of urbanization (forest cover): a. Downy Woodpecker (Linear regression, n.s.), b. Hairy Woodpecker (Linear regression, Adj, R2 = 0.219, F1, 126 = 36.65, p < 0.0001), c. Northern Flicker (Linear regression, Adj, R2 = 0.073, F1, 126 = 11, p = 0.0012), d. Pileated Woodpecker (Linear regression, n.s.), e. Redbreasted Sapsucker (Linear regression, Adj, R2 = 0.073, F1, 126 = 3.837, p = 0.0523). (GIF 168 kb)
Suppl 2
Relative abundance of native secondary cavity-nesting species along the gradient of urbanization (forest cover): a. Black-capped Chickadee (Linear regression, Adj, R2 = 0.1095, F1, 126 = 16.61, p < 0.0001), b. Bewick’s Wren (Linear regression, n.s.), c. Chestnut-backed Chickadee (Linear regression, Adj, R2 = 0.0921, F1, 126 = 13.88, p < 0.0003), d. Red-breasted Nuthatch (Linear regression, n.s.), e. Violet-green Swallow (Linear regression, n.s.). (GIF 176 kb)
Suppl 2
Relative abundance of non-native secondary cavity-nesting species along the gradient of urbanization (forest cover): a. House Sparrow (Linear regression, Adj, R2 = 0.2343, F1, 126 = 39.85, p < 0.0001), b. European Starling (Linear regression, Adj, R2 = 0.2227, F1, 126 = 37.39, p < 0.0001 (GIF 132 kb)
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Tomasevic, J.A., Marzluff, J.M. Cavity nesting birds along an urban-wildland gradient: is human facilitation structuring the bird community?. Urban Ecosyst 20, 435–448 (2017). https://doi.org/10.1007/s11252-016-0605-6
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DOI: https://doi.org/10.1007/s11252-016-0605-6