Arthropods associated with various age stands of Douglas-fir from foliar, ground, and aerial strata

Abstract

The arthropod community in a Douglas-fir forest near Blue River, Lane County, Oregon was investigated from March through August 1973. Five stands of Douglas-fir were sampled: two clearcuttings, a young-growth (20 years old), a midgrowth (125 years old), and an old-growth (450 years old) plot. A pole pruner was used to sample the foliar fauna on the trees in the young-growth plot. The ground fauna was sampled by pitfall traps, and the aerial fauna by rotary nets in each of the stand types. Relative abundances and general trophic categories and species lists for each strata are presented with comment. Trapping method efficiencies are discussed in light of the results of this study and data presented in the literature.