Two species of Psilochalcis (Hymenoptera: Chalcididae) wasps occurring in the Great Basin region western United States were sampled from three locations central Utah (USA) over a two-year period using Malaise traps. Each location is composed four contiguous habitat types: pinyon/juniper (Pinus edulis or P. monophylla and Juniperus osteosperma), sagebrush (Artemisia tridentata), cheatgrass (Brom...

Vegetation cover over time and space is the result of interactions betweenvegetation cover and environmental factors. Changes occurred in range covers are caused bymatrix dominance, one of the most important environmental factors. Decision support system(DSS) could be used for determining the rate and importance of each factor. Actually, inmethods based on DSS, relations between input and outpu...