Effects Of Urban Land-Use Type On Ground-Arthropod Community Structure (poster)

MCINTYRE, N. E., J. Rango, S. Faeth, and W. Fagan.

The richness and abundance of ground arthropods are being systematically monitored at 16 sites in the Phoenix metropolitan area. Using pitfall traps, arthropods are being collected over a 72-hour period once a month from four types of urban land use: residential, industrial, agricultural, and desert remnant. This long-term monitoring is providing fundamental information about how various facets of urbanization affect the diversity and distribution of ground arthropods, which may have important ramifications on ecosystem-level trophic dynamics, nutrient cycling, and other functions from the diverse ecosystem roles that arthropods play. Relationships among site, land-use type, and trophic position are among the topics under current investigation. Preliminary results show that agricultural sites had the greatest number of taxa, followed by desert-remnant, industrial, and residential sites; however, there were no significant differences in richness among land-use types when captures were standardized by trapping area. Predators and herbivores were most abundant in the agricultural sites, whereas scavengers were most abundant in desert-remnant and industrial sites, and detritivores were found primarily in residential areas. The greatest abundance of ground arthropods was collected at industrial sites, followed by residential, agricultural, and desert-remnant sites, but the numbers of individuals collected per taxon were the most evenly distributed in the desert-remnant sites. Sampling has revealed a diverse arthropod fauna that is characteristic of each of the types of urban land use, which may be useful in indicating latent effects of urbanization.