Spatial and Temporal Changes in Aphid (Homoptera: Aphididae) Species Assemblages Collected with Suction Traps in Idaho

Abstract

Detrended correspondence analysis of aphid data derived from the Idaho suction trap network was used to assess the spatial and temporal dynamics of aphid species assemblages in the region. Assemblages of aphids in early August were defined by latitude and longitude of traps. Distinct groupings of aphid species occurred in northern, southwestern, and eastern Idaho sites. Temporal analysis of aphid species assemblages was conducted by ordinating sites and species on three sampling intervals. Results indicated that the degree of change in aphid assemblages depended on trap location. Aphid assemblages in northern Idaho were both temporally and regionally isolated from those in southern Idaho and exhibited relatively little change. Temporal changes were more pronounced from June to July than from July to August. In general, the composition of aphid assemblages in western Idaho in June were similar to compositions at the eastern sites in August, reflecting regional shifts in crop phenology patterns.