Graduate Thesis Or Dissertation
 

Bird-habitat relationships at multiple spatial resolutions in the Oregon Coast Range

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j098zd325

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  • I analyzed the relationship between avian abundance and landscape structure at five spatial resolutions for 30 subbasins in the central Oregon Coast Range using remotely sensed data and a geographic information system (GIS). I developed maps of forest successional stages from Landsat Thematic Mapper (TM) data at a spatial resolution of 25 meters, or 0.06 hectares (ha). I applied a pixel aggregation technique to produce images at minimum mapping units (MMU) of 0.25, 1, 4, and 16 ha. Using a spatial pattern analysis program, I quantified the landscape structure of each subbasin at the five MMU's. I used bird abundance data from a previous study to model the relationships between the landscape structure at each MMU and abundance of each of five bird species: brown creeper (Certhia americana), gray jay (Perisoreus canadensis), Hammond's flycatcher (Empidonax hammondii), red-breasted nuthatch (Sitta canadensis), and song sparrow (Melospiza melodia). At all MMU's, the patch composition (the proportional abundance of each subbasin in a particular patch type) explained much of the variation in abundance for all species. For brown creeper, gray jay, Hammond's flycatcher, and red-breasted nuthatch, the percentage of mixed and conifer large sawtimber in the subbasin explained 42-78% of the variation in abundance. Mean patch size of mixed and conifer large sawtimber was a significant predictor of brown creeper abundance at fine MMU' s and for the red-breasted nuthatch at the coarsest MMU. The percentage of the subbasin in mixed small sawtimber was a significant predictor of Hammond's flycatcher abundance at the three coarsest MMU's. Percentage of the landscape in hardwood small/large sawtimber explained much of the variation in abundance for song sparrows. Landsat TM data can be useful in determining relationships between bird abundance and habitat. For the range of species and MMU's I analyzed, patch composition seemed to be more important for determining bird-habitat relationships than attributes of patch structure such as size and shape.
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