Yellow Warblers have experienced population declines in California, earning them special status as a Species of Special Concern. The causes are thought to be habitat loss, nest predation, and Brown-headed Cowbird parasitism. In order to effectively conserve their remaining populations it is imperative to understand their specific habitat requirements and susceptibility to predation and parasitism. Ecological factors that best explained the distribution of Yellow Warblers were investigated by conducting point counts and recording stream and landscape, vegetation, and predator and parasite characteristics along streams in Santa Cruz County, California. In addition, predation and parasitism pressures were examined by monitoring nests and determining reproductive success. Yellow Warblers were highly associated with agriculture on the landscape scale. On the patch scale, willow (Salix sp.) shrubs and stream characteristics that are conducive to willow growth were the best predictors of Yellow Warbler presence at a site. A notably large portion of the Yellow Warblers breeding in the study area was found along the Pajaro River, a stream that is leveed and managed for flood control through annual vegetation-reduction regimes. However, the Yellow Warbler's partiality to this heavily disturbed system was met with very low nesting success due to high predation rates and cowbird parasitism, indicating that this scenario may be an ecological trap.
|School:||San Jose State University|
|School Location:||United States -- California|
|Source:||MAI 48/01M, Masters Abstracts International|
|Subjects:||Ecology, Organismal biology|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be