Abstract
We demonstrate differences in the local population neighborhoods of two aphid species, Aphis varians and Macrosiphum valeriani, and how these neighborhoods correspond to the patchiness of their host plant, fireweed (Epilobium angustifolium). We define a neighborhood as the area in a patchy environment that the aphids use for a particular process during a specific period of time―a neighborhood may cover only part of a patch, or may encompass several patches. In a colonization experiment we measured initial settlement of fireweed from winter hosts at three levels of patchiness : areas of fireweed, plots within areas, and individual fireweed shoots within plots
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