Predicted GCMs: map of predicted potential future species distribution (i.e., potential suitable habitat), using the global change model scenario (one of 5 GCM scenarios). One can read from these maps the sensitivity of the species to its current environment, and make deductions of which species might potentially require more migration to persist in a globally changed climate. Note: these potential maps imply no barriers to migration.

GCM Difference: difference map between Modeled Current and Predicted GCM maps. The scores indicate the changes predicted in IV.

Potential Shifts: this map simply displays the modeled current distribution, along with predicted potential future distribution (using the GCM scenario) and the overlap where the species is now and is projected to be present in the future. You can interpret the legend to mean as follows:
current -> present in "predicted current" only (ie., species has lost ground)
predicted -> present in "predicted GCM" only (ie., species has moved to new territory)
overlap -> present in both "predicted current" and "predicted GCM" (ie., no change areas)

The gray shaded portions of the maps (No Data on legends) had no forest informationavailable, due to one or more of the following: (1) there were no data recorded for any treespecies for those counties (e.g., prairie states in the western part of the region), (2) one ormore of the four FIA regions (northeastern, north central, southeast, southern) did not reportthe species in their data base because it was not present in the region (e.g., distinctly northernor southern species), and (3) one or more of the FIA regions do not recognize a particularspecies name as present in the unit, even though it undoubtably is present but calledsomething else (e.g. taxonomic confusion like in the hickories (Carya sp.)).