Physical Sciences and Mathematics Commons^™

An Ornithological Investigation Of The Relationships Among Species Assemblages In Diverse Landscapes In Portland, Oregon, Trevor Attenberg

Environmental Science and Management Professional Master's Project Reports

This study involves geographic variables of the urban landscape and how they affect bird species assemblage. I utilized bird point count data from observation sites in the Portland, OR metropolitan region provided by Portland Environmental Services. Species data and its relationship with environmental variables were evaluated using Bray-Curtis Dissimilarity measurements together with Non-metric Multidimensional scaling (NMDS) to provide a clear image of the spatial relationships between sites. Land classification, water and canopy in 500 m buffers were quantified in order to describe important geographic variability among collection areas of bird data. Patterns indicating spatial trends in the urban landscape emerged. …