Poster from 2006 Cascades student poster session.This study compares arthropod biodiversity in areas infested with invasive cheatgrass Bromus tectorum with areas not infested. The goal of this project was to establish a baseline of the types of arthropods found in both habitats, discover if there is more diversity in either habitat and to find any patterns which might eventually help identify species that could be used as indicators of ecological or environmental status. Arthropods were collected with pitfall traps which were evenly spaced along a gradient containing both habitats. The results show that there is higher species richness and diversity in the areas infested with B. tectorum. Research and data processing on this project continues to date, however the author feels that impending data will support the results obtained so far.