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Appendix S1. Assessing the accuracy of model prediction under different sampling efforts and schemes, using artificially derived species.

Figure S1. An illustration of the Bayesian solution to the pseudo-absence dilemma (Eqn. 2; M = 100; x = 0).

Figure S2. The spatial structure of the number of invasive plants in Kruger National Park, as predicted from the Bayesian model. The order of species of the abundance maps is according to Table 1.

Figure S3. The relationship between sampling effort and the accuracy in abundance estimation.

Figure S4. The relationship between sampling effort and the accuracy in Moran’s I index.

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