COS 36-3 - CANCELLED - A comparative invertebrate study of Oregon Military Department installations in 3 Ecoregions – assessment of assemblages and sampling mythologies

Abstract: The Coast Range, Willamette Valley, and Columbia Plateau are three distinct Oregon ecoregions. A frequently overlooked but essential ecological component is invertebrate assemblages, because they interact with vegetation, wildlife, and organic matter and substantially shape habitats in which they reside. They are pollinators, decomposers, herbivories, predators, and prey. They support protected species and are themselves protected species. Documenting invertebrate assemblages provides important understanding of ecosystem health and resilience. Invertebrates were studied at three Oregon Military Department installations: Camp Rilea (Coast Range), Najaf Training Center (Willamette Valley), and Camp Umatilla (Columbia Plateau) with the goal of documenting invertebrate assemblages at each. The study approach was built on management objectives and characteristics of each installation, by identifying taxa of interest with potential to occur, types and distributions of habitats and microhabitats, and Military facilities and objectives. With this understanding, a general comparative study approach was established, which allowed tailoring for each installation. Concurrent studies were conducted at the installations that accounted for seasonal changes and unique habitat features and management needs. Survey locations were selected to ensure representative coverage of habitats and even spatial distribution. Because many invertebrates interact with their environment at a small spatial scale, microhabitats were specifically sampled. Methods focused on "guilds" based on shared characteristics important to detection: timing of peak activity (time of day, season); primary mode of transport (flying, swimming, burrowing, walking); and associated habitats and habitat features (microhabitat). Habitat features within each habitat include vegetation, decomposing organic matter, sub-surface within soils, on soil substrate, and aquatic features. A combination of standard techniques and secondary observations were used. This approach ensured that all taxa of interest and habitat features of interest were specifically targeted. Findings indicate unique invertebrate assemblages are present at each installation and are influenced by habitats present, site history, and ongoing management. Species that are invasive, biocontrol, rare, and were otherwise of ecological interest were detected and quantified. They, intern, inform both natural resource management and operations at each Installation. An adaptive, scientific approach was essential to successful study, allowing adjustments to optimize study design. Other important factors in the study included incidental observations, maximizing time spent in each survey area, staffing with observant biologists, and using efficient data collection tools. Survey limitations existed but were largely overcome by adaptiveness of the study design. This quantative research has already become important for optimizing natural resource management at each of the installations.