Predation is a major cause of nest failure for songbirds, yet information is lacking on the relative importance of predator species in different landscapes. We identified nest predators of Golden-cheeked Warblers (Dendroica chrysoparia) in an urban landscape, compared cause-specific mortality rates between urban and rural landscapes, and evaluated whether monitoring nests with cameras affected nest survival. We monitored 68 nests with cameras in Austin, Texas, during 2005, 2006, and 2008 to identify causes of mortality, including predators, in an urban landscape. The period mortality and predation rates were 0.60 (95% CI: 0.42–0.73) and 0.52 (95% CI: 0.37–0.68), respectively. We identified predators at 20 nests: Texas rat snakes (Elaphe obsoleta lindheimerii) depredated eight nests (40%), Western Scrub-Jays (Aphelocoma californica) depredated six (30%), Cooper's Hawks (Accipter cooperii) depredated two (10%), fox squirrels (Sciurus niger) depredated three (15%), and fire ants (Solenopsis sp.) depredated one nest (5%). We compared mortality rates, predation rates, and predators of the 68 camera-monitored nests in Austin to 74 nests monitored with cameras in the rural landscape of Fort Hood, Texas, during 1997–2002 and 2005. The period mortality rate (0.63, 95% CI: 0.47–0.75), predation rate (0.59, 95% CI: 0.45–0.73), and predator composition at Fort Hood were similar to those in Austin. Nest abandonment, hatching success, and nestling survival were also similar in both landscapes. We compared nest survival of the 68 camera-monitored nests to 62 active nests monitored without video cameras in Austin; period nest survival was slightly higher for camera-monitored nests (0.40, 95% CI: 0.22–0.58) than for nests without cameras (0.37, 95% CI: 0.19–0.54).
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 110 • No. 3