Abstract
 Connectivity of the American Agricultural Landscape: A Graph Approach Track: Agriculture Author(s): Margaret Margosian, Karen Garrett, Kimberly With, J. M. Shawn Hutchinson Landscape ecologists and population biologists have been utilizing graph theoretics to study landscape connectivity for a number of years, specifically the connectivity of habitat or other isolated landscape patches. We propose to utilize the same methods to examine the agricultural landscape as a function of potential for crop pathogen spread. Using a geographic information systems network, we explored the assignment of meaningful values for disease transmission based on crop densisties to graph edges, and then attempted to identify subgraphs within the system by droping edges based on threshold values to isolate regions of the landscape that might be quarantined in the event of a pathogen outbreak. We introduce the concept of using a chart not unlike a genetic dendogram as a tool for identifying and connecting the resulting subgraph regions. Margaret Margosian USDA APHIS PPQ CPHST 118 Seaton Hall Manhattan , KS 66502 US Phone: 785-532-3430 E-mail: peg.margosian@aphis.usda.gov Karen Garrett Kansas State University Plant Pathology 4744 Throckmorton Manhattan , KS 66506 US Phone: (785)532-1370 E-mail: kgarrett@ksu.edu Kimberly With Kansas State University Biology 2 Bushnell Manhattan , KS 66506 US Phone: (785)532-5040 E-mail: kwith@ksu.edu J. M. Shawn Hutchinson Kansas State University Geography 164B Seaton Manhattan , KS 66506 US Phone: (785)532-3414 E-mail: shutch@k-state.edu |
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