Graduate Thesis Or Dissertation
 

An Observational Study of the Effects of Wildfire on Hermit and Varied Thrush Distribution in the Mt. Washington Wilderness Area

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ws859p40n

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  • The hermit thrush (Catharus guttatus) and the varied thrush (Ixoreus naevius) are focal species for conservation of forested habitats in Oregon. Although habitat associations have been defined for both species, their response to changes in vegetation following wildfire has not been well studied. To help fill this information gap, I used data from remote audio recordings to compare detection frequencies of both species between burned and unburned areas in the Mount Washington Wilderness, Oregon, USA. I also compared key habitat variables for each species between burned and unburned areas. My results show that hermit thrush occurrence was greater in unburned plots and may be influenced by live tree basal area and snag density. I did not find evidence of a difference in varied thrush occurrence between burned and unburned plots. However, varied thrush occurrence may be correlated with canopy cover and live tree basal area following a fire. Further investigation of the effects of mixed severity fire is necessary in future studies to better understand the influence fire has on both thrush species occurrence in the high Cascades.
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  • 46 pages

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file details WoodrichSamuelT2022.pdf 2022-03-25 Público Baixar