Canopy arthropod community structure and herbivory in old-growth and regenerating forests in western Oregon

This paper describes differences in canopy arthropod community structure and herbivory between old-growth andregenerating coniferous forests at the H. 3. Andrews Experimental Forest in western Oregon. Species diversity andfunctional diversity were much higher in canopies of old-growth trees compared with those of young trees. Aphid bio-mass in young stands was elevated an order of magnitude over biomass in old-growth stands. This study indicateda shift in the defoliator/sap-sucker ratio resulting from forest conversion, as have earlier studies at Coweeta HydrologicLaboratory, North Carolina. These data indicated that the taxonomically distinct western coniferous and eastern deciduousforests show similar trends in functional organization of their canopy arthropod communities.