Model Results

Predictive Distribution Maps

Potential distributions based on multi-variate models (Ibáñez et al. 2009*)

Locations where IPANE volunteers have collected data on the presence or absence of Japanese barberry (Berberis thunbergii) are shown in the map on the left. Dots indicate sites where Japanese barberry was present (red) or absent (orange/yellow). The map on the right shows the potential distribution (darker areas indicating an increased probability of presence) of Japanese barberry in New England according to our model. The blue dots represent independently collected herbarium data used to validate the models.

These models have also been applied to Oriental bittersweet (Celastrus orbiculatus) and burning bush (Euonymus alatus):

*Ibáñez, I., J. A. Silander, A. Wilson, N. LaFleur, N. Tanaka and I. Tsuyama . 2008. Multi-variate forecasts of potential distribution of invasive plant species. Ecological Applications, In press.