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GARP for Dummies

GARP for Dummies. Predicting invasions using the GARP System. Darren Houniet and Paul Emms. GARP for Dummies. Abstract. GARP system used to predict invasions. This study applied GARP system to alien plants in fynbos. Provides a more simplistic step-by-step approach to the GARP system.

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GARP for Dummies

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  1. GARP for Dummies Predicting invasions using the GARP System Darren Houniet and Paul Emms

  2. GARP for Dummies Abstract • GARP system used to predict invasions. • This study applied GARP system to alien plants in fynbos. • Provides a more simplistic step-by-step approach to the GARP system.

  3. GARP for Dummies Introduction • The GARP System is a modelling program used to predict the extent of distribution range of wild plant species by creating envelope maps. • These envelopes are graphically represented as maps, which depict these distribution limits.

  4. GARP for Dummies Introduction • We were interested in determining the invasive potential of current invaders within the South African fynbos biome. • This report highlights the main methodologies used in the compilation of these species prediction envelopes.

  5. GARP for Dummies Methods • Jack-knifing: • Downloaded the ‘JAVA J2SE Runtime Environment 5.0’ software. • Downloaded the ‘DesktopGARPSetup 1 1 3.exec’ from the NISL website. • Had to be extracted and unzipped.

  6. GARP for Dummies Methods • Jack-knifing: • For each species all 42 variables were run once through the GARP System. • Then arranged into an excel spreadsheet. • ‘Average’ column inserted. • Average for ten Omissions and Comissions calculated.

  7. GARP for Dummies Methods • Jack-knifing: • Each value was then concatenated following which an addition column was created so that we could apply the indirect function to these values. • Ten most significant variables were then selected.

  8. GARP for Dummies Methods • GARP run: • The GARP System was opened under the program ‘Desktop GARP’. • Data uploaded using ‘Upload Data Points’ function. • Select the SAAAC option in the Dataset dialog box. • Ten significant variables could now be selected.

  9. GARP for Dummies Methods • GARP run: • The Convergent limit (Diagram 1) was set to .005 with 100 runs and 1000 iterations. • The ‘model’ option from the toolbar initiated the run. • This was then repeated using the ‘All selected layers’ option in place of the ‘All combinations of the selected layers’ option.

  10. GARP for Dummies Methods • Idrisi32: • The ‘Compiler.jar’ programme had to be downloaded. • The compiler program was then opened. • The desired species could then be selected. • The ‘Start Run’ function was then selected. • The IDRISI-32 program was initiated.

  11. GARP for Dummies Methods • Idrisi32: • The ‘Data Paths’ function was selected. • The ‘ArcInfo Raster Exchange Format’ window was then opened. • The ‘ArcInfo raster ASCII format to Idrisi’ option was selected. • The input file was the ‘asci’ file for that species (i.e. Ac_cycl.asc). • The output file consisted of only the species name

  12. GARP for Dummies Methods • Idrisi32: • The reference system used was ‘latlong’. • A final species prediction map was then generated.

  13. GARP for Dummies Methods • Boolean mapping: • There were two Idrisi files per species: • Idrisi Raster Documentation File, • RST File. • Each placed into separate folders. • A Boolean map was generated using the RST file.

  14. GARP for Dummies GARP map of Acacia cyclops

  15. GARP for Dummies Boolean map Acacia cyclops

  16. GARP for Dummies GARP map of Acacia longifolia

  17. GARP for Dummies Boolean map of Acacia longifolia

  18. GARP for Dummies GARP map of Acacia mearnsii

  19. GARP for Dummies Boolean map of Acacia mearnsii

  20. GARP for Dummies GARP map of Acacia melanoxylon

  21. GARP for Dummies Boolean map of Acacia melanoxylon

  22. GARP for Dummies GARP map of Atriplex nummularia subsp. nummularia

  23. GARP for Dummies Boolean map of Atriplex nummularia subsp. nummularia

  24. GARP for Dummies GARP map of Eucalyptus camaldulensis

  25. GARP for Dummies Boolean map of Eucalyptus camaldulensis

  26. GARP for Dummies GARP map of Hakea sericea

  27. GARP for Dummies Boolean map of Hakea sericea

  28. GARP for Dummies GARP map of Metrosideros excelsa

  29. GARP for Dummies Boolean map of Metrosideros excelsa

  30. GARP for Dummies GARP map of Nicotiana glauca

  31. GARP for Dummies Boolean map of Nicotiana glauca

  32. GARP for Dummies GARP map of Pinus pinaster

  33. GARP for Dummies Boolean map of Pinus pinaster

  34. GARP for Dummies GARP map of Populus X canescens

  35. GARP for Dummies Boolean map of Populus X canescens

  36. GARP for Dummies GARP map of Prosopis glandulosa Tarr. Var. torreyana

  37. GARP for Dummies Boolean map of Prosopis glandulosa Tarr. Var. torreyana

  38. GARP for Dummies GARP map of Schinus molle

  39. GARP for Dummies Boolean map of Schinus molle

  40. GARP for Dummies Methods in full: • To view the methods in full on a word document, open up the link to the ‘methods in full’ heading above.

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